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  • 101
    Electronic Resource
    Electronic Resource
    One Country, Two Systems, and Three Memberships: Legal and Economic Integration between China and its Two SARs (2008)
    Berkeley, Calif. : Berkeley Electronic Press (now: De Gruyter)
    Global jurist 7.2008, 3, art7 
    Details
    ISSN: 1934-2640
    Source: Berkeley Electronic Press Academic Journals
    Topics: Economics
    Notes: This paper examines legal and economic integration between China and its two Special Administrative Regions, namely, Hong Kong and Macau. Two dimensions are dealt with in this paper: the constitutional/national framework and the WTO/CEPA framework. In the constitutional/national framework, this paper examines the interaction between People's Supreme Court and the Court of Final Appeal in Hong Kong and Macau. It analyzes the horizontal and vertical interaction between courts in China and in the Special Administrative Regions, focusing mainly on three issues: the Standing Committee/CFA, exclusive/residual competence, and the competition of jurisdiction. In the WTO/CEPA framework, this paper presents the legal bases and accession histories of these three memberships in the WTO, and examines their trade policies and practices both in the GATT and the WTO. Emphasis is placed on how and why Hong Kong, China and Macau, China enjoy full memberships in the WTO as China does. This paper finally explores the dispute settlement mechanism provided in the Closer Economic Partnership Arrangements between China and its two SARs, and examines the possibility for these three members to avail themselves of the WTO dispute settlement mechanism. This paper finds that the legal and economic integration between China and its two SARs offers much both to comparative lawyers and international trade lawyers: the vast diversity of legal culture in these three areas yields an unprecedented conflict and combination, while the interaction between China and its two separate customs territories, Hong Kong, China and Macau, China, in the international trading regime, presents a new landscape in the WTO.
    Type of Medium: Electronic Resource
    URL: http://www.bepress.com/gj/vol7/iss3/art7
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  • 102
    Electronic Resource
    Electronic Resource
    TEXT, VISUALISATION AND POLITICS: LONDON, 1150–1250 (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 69-99 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: Focusing on London, the paper discusses the interaction between theoretical, descriptive and quasi-historical writing about cities, a growing capacity to visualise city landscape and activities, and forms of graphic representation that drew on those ideas. Reading this interplay as a political space, the paper explores the structure, content and purposes of the ‘London Collection’ of national laws, pseudo-laws and city customs put together in London at about the time of Magna Carta. Though no more than a preliminary investigation, the exercise reveals the extent to which London interests, especially with regard to the politics of international trade, the ‘law of London’, earlier episodes of communal activism and a sense of London's historic destiny within that of the nation pervade the collection as a whole. This casts some doubt on the supposed antiquity of some of the London laws in the collection, which may well have been adjusted for the occasion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000662
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  • 103
    Electronic Resource
    Electronic Resource
    BRITAIN AND GLOBALISATION SINCE 1850: III. CREATING THE WORLD OF BRETTON WOODS, 1939–1958 (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 1-42 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: During the Second World War, attention turned to reconstructing the world economy by moving away from competitive devaluations, protectionism and economic nationalism that had marred the 1930s. The Americans had considerable economic and political power, and they wished to restore multilateral trade, fixed exchanges and convertibility of currencies. The British government was in a difficult position, for it faced a serious balance of payments deficit and large accumulations of sterling in the Commonwealth and other countries. Multilateralism and convertibility posed serious difficulties. This address considers whether the American government had economic and financial hegemony after the war, or whether it was constrained; and asks how the British government was able to manoeuvre between America, Europe and the sterling area. The result was a new trade-off between international monetary policy, free trade, capital controls and domestic economic policy that was somewhat different from the ambitions of the American government and from British commitments made during and at the end of the war.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000649
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  • 104
    Electronic Resource
    Electronic Resource
    HIGH AND LOW: TIES OF DEPENDENCE IN THE FRANKISH KINGDOMS (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 43-68 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: Our understanding of ties of loyalty and dependence formed at the level of the Carolingian political elite has been much improved by a great deal of excellent recent research. As mutually beneficial relationships freely entered into, they tend to be sharply distinguished from ties of dependence involving members from the lower echelons of society: the latter ties, on the contrary, are usually seen as the result of coercion, and they were long seen as emblematic of the increasingly oppressive control of local lords. Commendation for these less powerful members of society is thus often seen as tantamount to forfeiting free status. Because oppression, for legitimate reasons, has been so strongly emphasised in historical treatments of this type of relationship, paradoxically little attention has been given to what influence the lower-status party may have had on the proceedings, the extent of their negotiating ability or the range of duties and benefits involved in such agreements. But not all lower-status people made the same deals: the Frankish formularies, an important source of evidence regarding such arrangements, show a complicated situation, indicating that ties formed at this lower level need to be treated with as much nuance as higher-status relationships.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000650
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  • 105
    Electronic Resource
    Electronic Resource
    WRITING WAR: AUTOBIOGRAPHY, MODERNITY AND WARTIME NARRATIVE IN NATIONALIST CHINA, 1937–1946 (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 187-210 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: The Sino-Japanese War of 1937–45 was perhaps the single most destructive event in twentieth-century Chinese history. However, there has been relatively little attention paid to how war was experienced in the Nationalist-controlled area (‘Free China’) under Chiang Kaishek. Two autobiographical texts are examined here, one a sequence of reportage from the early war years by the journalist Du Zhongyuan, and one a biji (notebook) written immediately after the war's end by the social scientist Xu Wancheng. By choosing particular modern or anti-modern genres and styles to write in, the authors expressed a wider sentiment about the war's ambiguous role in modernising China. Du's work hopes to create modernity from destruction; Xu's suggests that modern warfare has created chaos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000704
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  • 106
    Electronic Resource
    Electronic Resource
    CENTRE AND PERIPHERY IN THE EUROPEAN BOOK WORLD (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 101-128 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: The rapid spread of print in the fifteenth century masks considerable difficulties that faced the industry in adapting to the new disciplines of mass production. Many early print shops were short-lived. Within two generations production of printed books was concentrated in a comparatively small number of major centres of production. This paper explores the implications of these developments for our understanding of the ‘print revolution’. It considers in particular the contrasting fortunes of three major markets: France, one of the largest centres of production; the Netherlands, a major hub of international trade; and England, which lay towards the periphery of the European book world.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000674
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  • 107
    Electronic Resource
    Electronic Resource
    A TALE OF TWO EPISCOPAL SURVEYS: THE STRANGE FATES OF EDMUND GRINDAL AND CUTHBERT MAYNE REVISITED (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 129-163 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: This article seeks to relate the course of Edmund Grindal's disgrace to the formulation and enforcement of policy against catholics. It argues that the two were integrally related and that the nature of that interrelationship can be seen as a function of certain manoeuvres and debates about a range of issues involving the queen and her councillors and bishops and indeed members of the wider regime. The resulting exchanges were conducted in terms of the nature and relative significance of the popish and puritan threats. The aim here is to reveal the dynamics of the resulting mode of ideological politics and to show how very serious differences of approach, priority and world view could be both canvassed and contained within the consensual mechanisms and assumptions of the Elizabethan regime. Through a close analysis of one political moment the paper also hopes to demonstrate the extent to which a series of conventionally separately told stories – about ecclesiastical affairs, about foreign policy, about puritans and about catholics, about both court and local politics – need to be seen as parts of a unitary political narrative or process, the nature of which this paper is an attempt to reveal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000686
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  • 108
    Electronic Resource
    Electronic Resource
    THE LANGUAGE AND SYMBOLISM OF CONQUEST IN IRELAND, c. 1790–1850 (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 165-186 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: The question of whether Ireland had been conquered by England has received some attention from historians of eighteenth-century Ireland, mainly because it preoccupied William Molyneux, author of the influential The Case of Ireland . . . Stated (1698). Molyneux defended Irish parliamentary rights by denying the reality of a medieval conquest of Ireland by English monarchs, but he did allow for what could be called ‘aristocratic conquest’. The seventeenth century, too, had left a legacy of conquest, and this paper examines evidence of consciousness among Irish Protestants of descent from ancestral conquerors. It considers how and why this consciousness took a more pronounced sectarian turn during the 1790s. Williamite anniversaries, increasingly associated with the Orange Order, became identified in the Catholic mind as symbolic reminders of conquest. Thanks to the protracted struggle for ‘Catholic emancipation’, this issue continued to feature in political debate about Ireland well into the nineteenth century, while the passing of the Act of Union (1800) revitalised the older debate about whether England could be said to have conquered Ireland. Liberal Protestants and Catholics contended that England had invariably intervened to prevent any possibility of reconciliation between conquerors and conquered. Thus the language of conquest remained highly adaptable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000698
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  • 109
    Electronic Resource
    Electronic Resource
    THE DEATH OF A CONSUMER SOCIETY (2008)
    Cambridge : Cambridge University Press
    Transactions of the Royal Historical Society 18 (2008), S. 211-236 
    Details
    ISSN: 0080-4401
    Source: Cambridge Journals Digital Archives
    Topics: History
    Notes: This paper argues that the meaning of consumer society has changed over the last half century, principally through the prioritisation of choice over access. It does this through an examination of the global consumer movement and a consideration of its successes and failures. It demonstrates that through the movement's own tactics, and the defeats it suffered by opponents of regulation, its earlier emphasis on the right of consumers to enjoy basic needs has given way to a greater focus on choice. Consequently, the changing fortunes of consumer activism around the world both reflect and explain the reorientation of global consumer society over the last few decades.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0080440108000716
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  • 110
    Electronic Resource
    Electronic Resource
    Silver Nanoparticles, Cages and Flowers Growing on Carbon Nanosheets (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 5-8 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.5.pdf
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  • 111
    Electronic Resource
    Electronic Resource
    Shape Control in Composite Laminates Using Piezoelectric Actuators considering Thermal Deformation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 125-130 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Based on the first order shear deformation plate theory, a numerical analysis model ofcomposite laminated plates with distributed PZT actuators under thermal load was established, andthe corresponding formulae of finite element method were presented considering the effect ofadhesive layer between PZT actuator and plate. For a two ends simply supported plate, the thermaldeformation of the plates induced by different temperatures on the upper and lower surfaces and thethermal deformation compensation for the plates using PZT actuators were studied, then theoptimization of voltages applied to each actuator was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.125.pdf
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  • 112
    Electronic Resource
    Electronic Resource
    Effect of Vibrations on Void Content in Composite Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 145-148 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Eliminating common defects such as voids, bubbles and poor adhesion at interfaces willincrease the quality of laminated sandwich composite structure. We are experimenting andanalyzing the effect of mechanical vibrations applied to the curing system of composite materialsproduction, particularly on minimizing void content. The range of frequency of vibrations coveredwas from 2Hz to 8kHz, for different period of vibrations. The composite laminates were made byhand lay-up using glass fibres and vinyl-ester resin, and examined under a microscope to determinetypes and quantity of defects. The results showed reduction in the number of bubbles (as well as invoid content) at frequencies between 10Hz and 50Hz for 30 minutes of vibrations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.145.pdf
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  • 113
    Electronic Resource
    Electronic Resource
    Manufacturing and Testing of High Performance Sheet Moulding Compound (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 141-144 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The paper describes the manufacture of thin composite panels using high performancesheet moulding compound (SMC). Topics discussed within the paper include characterisation ofcuring and flow behaviour of SMC material, tooling design concept and determination of suitableprocessing conditions for compression moulding. A Full scale “Burst test” was carried out to evaluatethe mechanical performance of SMC panels. The overall performance of the SMC panels wassatisfactory with all panels failed beyond the specification value. The main failure mode was athrough-thickness cracking. In addition, a geometrical non-linear numerical analysis was also carriedout to investigate the stress distribution and deflection behaviour of SMC panel during “Bursttesting”
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.141.pdf
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  • 114
    Electronic Resource
    Electronic Resource
    Simulations of Delamination Propagation in Composite Laminates under Static and Low-Velocity Impact Transverse Loads Using a New Cohesive Model (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 137-140 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, we have proposed a new cohesive model to stably and accurately simulatedelamination propagations in composite laminates under transverse loads. In this model, we set up apre-softening zone in front of the original softening zone. In this pre-softening zone, the initialstiffness is gradually reduced as the interface strength decreases. However, the onset displacement forstarting the real softening process is not changed in this model. The fracture toughness of materialsfor determining the final displacement of complete decohesion is not changed too. This cohesivemodel is implemented in the explicit time integration scheme. A DCB problem is employed toanalyze the characteristics of the present cohesive model. Moreover, an experimental example oflaminates under impact loads is employed to illustrate the validity of the present method
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.137.pdf
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  • 115
    Electronic Resource
    Electronic Resource
    Effect of Processing Method on Conductivity and Mechanical Properties of Glass Fibre Reinforced Carbon Black Filled Polyethylene (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 131-136 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The conductivity and mechanical properties of carbon black (CB) filled polyethylene (PE)composites depend on the conductive filler, molecular structure of polymer matrix, and theprocessing methods which are applied. CB filled high density polyethylene without and with glassfibre (GF) composites have been manufactured using single and twin screws extruder. Thecomposite made from the single screw extruder showed a much higher conductivity than that madefrom twin screws extruder for CB/PE composites with and without glass fibre. The conductivepaths are formed at very low CB content (1wt% CB for GF/CB/PE) when using single screwextruder to manufacture. The microstructure of these composites were analysed using SEM
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.131.pdf
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  • 116
    Electronic Resource
    Electronic Resource
    Rheology of Magnetorheological Shear Thickening Fluids (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 161-164 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents fabrication and characterizing of a new functional material,magnetorheological shear thickening fluid (MRSTF), by mixing micron-sized magnetizableparticles with nano-sized silica particle based shear thickening fluid. Dynamic properties of theMRSTF were characterized by using a parallel-plate rheometer. The effects of steady-state shearrate and magnetic field on MRSTF rheological properties were addressed. The suspension shows anabrupt increase in complex viscosity beyond a critical dynamic shear rate and a magnetic fieldcontrollable characteristic, as well as reversible
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.161.pdf
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  • 117
    Electronic Resource
    Electronic Resource
    A Knowledge-Based System for Temperature Prediction in Hot Strip Mills (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 153-156 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Rolling temperature is an important factor affecting mechanical properties of hot rolledstrip significantly. Traditional techniques cannot meet higher precision control imperatives. In thepresent work, a novel knowledge-based system has been developed for the temperature predictionin hot strip mills. Neural network has been used for this purpose, which is an intelligent techniquethat can solve nonlinear problem of temperature control by learning from the samples. Furthermore,an annealing robust learning algorithm was presented to adjust the hidden node parameters as wellas the weights of the adaptive neural networks. Simulations in a multi-object mode have beencarried out to verify the effectivity of new neural optimization system. Calculation results confirmthe feasibility of this approach and show a good agreement with experimental values obtained froma steel plant
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.153.pdf
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  • 118
    Electronic Resource
    Electronic Resource
    Surface Roughness and Wear of Work Roll Containing Ti in Cold Strip Rolling (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 157-160 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The consumption of work rolls in cold strip mills is significant. One of the key issues forwork rolls is the surface roughness which affects the rolling stability and surface finish of the strip.The produced strip has lower surface finish if the roll surface roughness is large. However, if theroll surface roughness is small, it is not helpful for establishing the rolling process, which willreduce the productivity. In this case, a laser treatment is employed to increase the value of rollsurface roughness. In order to reduce the times of roll grinding, the cold strip mill and rollmanufacturers have developed new types of rolls such as the rolls containing Ti to increase the rollwear resistance in cold strip rolling. Results show that the new 4CrTi roll has a significantadvantage of preventing decrease of the roll surface roughness. The size and generation of particlesduring roll wear process and the effect of Ti on roll wear have been discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.157.pdf
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  • 119
    Electronic Resource
    Electronic Resource
    High Performance Composites Using Nanotechnology (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 149-152 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Lightweight design, using high performance composites, which directly yields a reducedneed for fuel is in the focus of new developments for traffic engineering. The increased substitutionof traditional, metal based materials by fibre-reinforced composites in the aviation industryexemplifies this trend. In addition to mechanical properties, e.g. an increase in strength, that leads todirect weight savings, or improved dynamical performance, which translates into longermaintenance intervals, i.e. longer service-life. In the field of fibre-reinforced polymer matrixcomposites possible contributions from nanotechnology are currently reviewed. The modification ofthe matrix by introducing a “nanophase” has attracted most attention up-to-date. Additionalapproaches include modification of traditional reinforcements, as well as the development of newreinforcing materials. Desired improvements include mechanical properties, interlaminar shearstrength, reinforcement in z-direction, fiber-matrix adhesion, and obtaining new functionalities.Starting from a summary of the most important effects of nano-modifiers in polymeric matrices, thepresentation will review published results on the modification of thermoset matrix fiber-reinforcedcomposites by using nanotechnology, as well as some of our own work in that field. Furthermore,applications of such modified composites in component parts are discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.149.pdf
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  • 120
    Electronic Resource
    Electronic Resource
    Investigation of Bimodal Particles Based Magnetorheological Elastomers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 165-168 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents the study of rheological and mechanical properties of MR elastomersfabricated using small and large particle. Analysis indicated that MR elastomers fabricated withbimodal particles at a specific particle ratio ingredient show enhanced MR effect compared withthose fabricated with monoparticles. MR elastomer samples were fabricated by using small andlarge particles with sizes of 5[removed info]m and 50[removed info]m respectively. Their rheological and mechanicalproperties were characterized with a MR rheometer. Experimental results agree well with theanalysis
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.165.pdf
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  • 121
    Electronic Resource
    Electronic Resource
    Analysis of Casting Roll Temperature Field during Twin-Roll Thin Strip Casting (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 169-172 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In twin-roll strip casting process, the temperature variation of casting roll can result inroll thermal stress and fatigue. It not only affects the thermal deformation of casting roll and thegeneration of the roll surface cracks significantly, but also influences the surface quality, shape andprofile of the produced strip, and the service life of the casting roll. In this paper, a 3D couplingthermal-flow finite element modelling has been conducted. For twin-roll casting of stainless steel,the influences of the casting speed and liquid level in molten pool on the temperature field ofcasting roll have been simulated and discussed. The developed model is very helpful in optimisingthe processing parameters and the design of casting roll during twin-roll thin strip casting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.169.pdf
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  • 122
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    Gate Location and its Effects on Product Quality in Injection Moulding (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 181-184 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Design of gate location is a crucial factor in achieving product quality in injectionmoulding. It Influences the manner of plastic flow into the cavity. The optimum gate locationimproves quality and avoids products defects. This paper presents an investigation for the effects ofgate location on product quality in injection moulding. Plastic advisor, simulation softwareembedded in Pro/Engineer package has been used for flow analysis of plastic product for selectedgate locations. It has been shown that optimum gate location improves cooling quality resulting in abetter product quality. The previous conventional experiences by individual credited engineers havebeen considered
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.181.pdf
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  • 123
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    The Development of a New Image Acquisition & Analysis System for 3D Surface Measurements Using Confocal Laser Scanning Microscopy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 173-179 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Quantitative surface measurement is an important field in many applications includingmaterials science and engineering quality control. A non-destructive and versatile technique forquantifying surface roughness in 3D is Confocal Laser Scanning Microscopy (CLSM). However,this technique has not been widely accepted to use for quantitative surface measurements due tolimited work on it. The project has researched the suitability of using the system for surfacecharacterization and appropriate settings for image acquisition for quantitative surface analysis.Based on the above fundamental work, this study has developed and presented a comprehensiveapproach of using the system for quantitative surface characterization through image processing, 3Dimage construction, image stitching and numerical image analysis. The surface characterizationresults presented in the paper have demonstrated that the system can be used to accurately measuresurface roughness of engineering surfaces
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.173.pdf
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  • 124
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    Effect of Surface Texture on Deformation Behavior of Asperity in Cold Metal Forming (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 185-188 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It was impossible to obtain the transverse friction along the strip width in mostprevious studies of cold strip rolling because the surface roughness lays were assumed to be verticalto the rolling direction. In this study, several types of oblique roughness textures were manufacturedon aluminum samples and compression tests were carried out to obtain the effect of differenttextures on the deformation behavior of surface asperity. Different surface textures resulted in verydifferent peak value of stress. It was found that stress was high and changed dramatically at theinitial compression stage but tended to be stable when the total reduction increased. The asperity ofwhich the top angle is 160° showed relatively high resistance to deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.185.pdf
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  • 125
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    Effect of Fully Porous-Coated (FPC) Technique on Osseointegration of Dental Implants (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 189-192 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper provides a preliminary understanding in biomechanics with respect to a fullyporous-coated (FPC) dental implant. A 2D multiscale finite element model is created for a typicaldental implantation setting. Under a certain mastication force (〈200N), a global response is firstobtained from a macro-scale model (without coated surface morphology details), and then it istransferred to a micro-scale model (with coated surface morphology details), which allowsdetermining a local biomechanical field. To facilitate the study in bone remodelling, strain energydensity and equivalent strain are analysed respectively. Different porosities of coating are taken intoaccount in this study to investigate the effect of FPC materials on these typical remodelling stimuli.The results evidently reflect the osseointegrative benefits generated from surface coating. The resultreveals that increasing in particle sizes has significant effect on biomechanical response
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.189.pdf
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  • 126
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    Simulation on Optical Properties of Gold and Silver Coated Nano Coreshell (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 39-44 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Fabrication, optical property of nano coreshells and their potential applications inchemical and biological sensors have attracted much research interest. In this paper, we simulatedthe effect of size, structure, and dielectric properties as well embedding medium on the opticalproperties of gold or silver coated coreshell nanoparticle and the corresponding effects both ofphase-retardation and of electron interface scattering as well as the nansize effect were discussed.Intriguing transition of the optical properties was simulated when a two-phase core-shellnanoparticle changes gradually into the single phase nanoparticle. We also obtained a goodcorrelation of the simulation to the experimental results. Thus, the simulation has many implicationsand can guide further core-shell nanostructure fabrication with optimization of its optical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.39.pdf
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  • 127
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    Finite Element Analysis of Plant Cell Wall Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 197-202 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Illuminating fundamental aspects of plant cell wall mechanics will lead to novelbiological and engineering inspired strategies for application in the cotton and wood fiber industriesand in developing novel plant-derived materials that are increasingly seen as environmentallyfriendly alternatives. The stiffness properties of cell wall polymers such as cellulose microfibrilsand xyloglucans are known but the relationship between the composite structure of the wall and itseffective stiffness remains poorly understood. Understanding this relationship is important toengineers using and designing plant-derived materials and to biologists studying plant growth. Wehave developed a software system to generate microfibril-xyloglucan networks resembling thosefound in cell walls. Finite element analysis was implemented to predict the effective Young’smodulus of varying sizes of the microfibril-xyloglucan network. Results from the finite elementmodels show that the network’s effective moduli of the cell walls having microfibrils parallel toapplied loadings are relatively high (~90-215MPa) compared with those of the walls havingrandomly oriented microfibrils (~20-47MPa). The walls having microfibrils parallel to each otherbut perpendicular to applied loadings have lowest stiffness (~17-118kPa). The Young’s moduli aresignificantly lower than those of its constituent polymers and generally in agreement withexperimentally measured values
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.197.pdf
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  • 128
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    Numerical Prediction of Influence of Diamond Burs on Subsurface Damage in Intraoral Adjustments of Porcelain Prostheses (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 203-206 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Failure rate is noticeably high in dental bioceramics for restorations even though progresshas been made in reinforcement of the materials. One of the major causes of failures is due to surfaceand subsurface damage induced in intraoral adjustments. This process is a routine clinical procedurefor marginal and occlusal fit using high-speed dental handpieces and diamond burs. Material removalusing the diamond burs easily produce surface and subsurface damage in ceramic prostheses.Therefore, it is essential to minimize the surface damage in clinical dentistry. In this paper, weinvestigated the effect of diamond burs with coarse, medium and fine grit sizes on the degrees ofsubsurface damage in in vitro dental adjustments via numerical modeling. Finite element analysis wasapplied to model the dental adjusting processes and to predict the degrees of subsurface damage usingdifferent grit sizes of diamond burs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.203.pdf
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  • 129
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    Magnesium and Magnesium Alloys as Degradable Metallic Biomaterials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 207-210 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Drawbacks associated with permanent metallic implants lead to the search for degradablemetallic biomaterials. Magnesium alloys have been highly considered as Mg has a high biocorrosionpotential and is essential to bodies. In this study, corrosion behaviour of pure magnesium andmagnesium alloy AZ31 in both static and dynamic physiological conditions (Hank’s solution) hasbeen investigated. It is found that the materials degrade fast at beginning, then stabilize after 5 daysof immersion. High purity in the materials reduces the corrosion rate while the dynamic conditionaccelerates the degradation process. In order to slow down the degradation process to meet therequirement for their bio-applications, an anodized coating is applied and is proved as effective incontrolling the biodegradation rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.207.pdf
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  • 130
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    Modification of Porous Alumina Ceramics with Bioinert and Bioactive Glass Coatings (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 211-214 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Porous biomaterials including porous bioceramics play important roles for hard tissuereplacement and regeneration. I this paper, porous alumina (with and without zirconia addition)ceramics were produced via coating polyurethane (PU) foams with Al2O3 (ZrO2) slurries, followedby drying at room temperature and sintering at 1300 oC. The advantage of the PU foam method wasthe achieved high pore interconnectivity, but the mechanical properties of the porous ceramics wererather poor due to the high macroporosity and the high microporosity. To remove the microporosityand strengthen the porous alumina ceramics, a lanthanum-modified aluminosilicate (LAS) glass wasused to infiltrate the alumina struts. Nevertheless, the resulting LAS-modified macroporous aluminaceramics would have no ability to bond to bone tissues. To impart a bioactivity (i.e. the ability ofbone bonding) to the bioinert porous ceramics, a bioactive glass layer was applied by dipping withthe bioactive glass slurry and sintering at 1200 oC. The twice coated porous alumina ceramicswould exhibit high compressive strengths, allow bone tissue ingrowth, and form strong bonematerialintegration. A biodegradable filler – calcium phosphate cement was also incorporated. Apossible application of the porous bioceramics would be for the maxillofacial reconstruction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.211.pdf
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  • 131
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    Novel Synthetic Bio-Mimic Polymers for Cell Delivery (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 215-222 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Cell-based therapy is one of the major potential therapeutic strategies for cardiovascular,neuronal and degenerative diseases in recent years. The aims of this study is to develop a novel biomimicpolymeric materials which will facilitate the delivery cells, control cell bioactivities andenhance the focal integration of graft cells with host tissues. We synthesized a novel tri-blockcopolymer, methoxy-terminated poly (ethylene glycol) (MPEG)-polyL-lactide (PLLA)-polylysine(PLL) via sequential polymerization of PLLA onto MPEG, followed by ring opening polymerizationof PLL onto the functionalized chain end. The triblock copolymer (5%) was then mixed with highmolecular weight PLLA (95%) to form cell-delivery membranes. The spectra of copolymers weredetermined by NMR and ATR-FTIR spectroscopy. Human osteoblasts were used for testingbiocompatibility and initial cellular reaction. It was noted that no cytotoxicity was detectable in oursynthesized copolymers. Compared with pure PLLA and diblock copolymers, the triblockcopolymers showed significantly better cell adhesion and proliferation. Interestingly we identifiedthat cellular activity (attachment, proliferation and differentiation) could be regulated by themolecular weight and composition of the triblock copolymers. In conclusion controllable syntheticcopolymers can be designed and synthesized to modulate cellular function in facilitating tissuerepair and regeneration
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.215.pdf
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  • 132
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    Evaluation of Dentinal Viscoelastic Properties Based on its Microstructural Characters (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 229-232 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: On the basis of the characters of dentinal microstructures, a new Three-Parameter-Solidviscoelastic mechanics model which can predict strain creep, stress relaxation and instant elasticitywith anisotropic constitutive relation for the human dentin is developed in this paper. The porousprotein-mineral model is adopted to obtain the independent dentinal viscoelastic moduli based onits microstructural characters. The influencing mechanisms and the viscoelastic properties of themicrostructural dentin are also evaluated by the Three-Parameter-Solid viscoelastic model. Theviscoelastic predictive results obtained from the Three-Parameter-Solid viscoelastic model agreewell with those from the experimental investigation in both wet and dry situations
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.229.pdf
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  • 133
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    In Search of a Parameter to Distinguish Viable from Non-Viable Articular Cartilage – Indentation and Ultrasound Studies (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 223-228 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: It has been recently established that mechanical indentation does not sufficientlydiscriminate between normal and degraded articular cartilage. Consequently, we have carried outpreliminary research to develop and evaluate a number of indices and parameters that cancharacterise and categorise the tissue into viable and degraded types relative to functional integrity.In this paper, we report the outcome of correlation studies between the instantaneous structuralrebound following unloading from a known level of indentation and reflected ultrasound signals,analysed in the frequency domain. We subjected 137 samples from 10 normal and 10 osteoarthriticjoints to ultrasound waves and mechanical indentation-rebound tests, and determined the degree ofcorrelation between the instantaneous rebound and the principal components of the ultrasoundspectra and further investigated this using canonical discriminate analysis that was fitted with ageneral linear model. Our results demonstrate a strong correlation between rebound and ultrasoundresults, leading to the conclusion that it is possible to determine the mechanical and structuralviability of articular cartilage using non-contact methods
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.223.pdf
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  • 134
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    Residual Stress Estimation of Tungsten Film by GIXRD (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 75-78 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Subsurface residual stresses of tungsten films induced by Chemical Mechanical Polishing(CMP) processes were investigated by the Grazing Incident X-Ray Diffraction (GIXRD). Basis of theGIXRD measurement was introduced and the experiments were conducted for residual stress oftungsten film measurements. Experimental procedures of the GIXRD measurements were presented.The obtained residual stresses value of tungsten films from 800 nm to 400 nm varies from 1086.1 ±105.2 MPa to 1670.6±103.4 MPa prior and after CMP process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.75.pdf
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  • 135
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    Stress Corrosion Cracking of NiTi Orthodontic Wires in Sodium Fluoride Solution (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 79-82 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The influence of fluoride on stress corrosion cracking (SCC) of NiTi orthodontic wireswas investigated using slow strain rate test (SSRT) and scanning electron microscopy (SEM). Theresults indicated that fluoride significantly accelerated the stress corrosion cracking of NiTiorthodontic wires. The fractographies of NiTi orthodontic wires exhibited striation pattern
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.79.pdf
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  • 136
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    Bonding of Aluminum Alloy by Hot-Dipping Tin Coating (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 93-98 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents bonding technology of aluminum alloy by hot-dipping tin. Thedissolution curve of copper in molten tin liquid was obtained in the experiment of hot-dipping Sn.Optimal hot-dipping parameter which was suitable for soldering was designed. To elucidatecharacteristics of interfacial evolution, the microstructure of the coatings, soldered joint wereanalyzed using optical microscopy, SEM and EDX. The shear strength of soldered joints was testedas high as 39.9Mpa, which is high enough to achieve the requirement of electronic industry
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.93.pdf
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  • 137
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    Experimental Research on Grain Orientation Evolution of Extruded Mg Alloy AZ31B Sheet during Uniaxial Tensile Deformation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 87-92 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The orientation rotation in extruded Mg alloy AZ31B sheets during uniaxial tension atroom temperature has been investigated using SEM/EBSD technique. According to theexperimental results and the calculated results of Sachs crystal model, the quantitative rule of thetensile axis rotation for the grains (parent), and the associated slip systems have been analyzed indetail. The influencing factors of twinning area fraction have also been studied. The results showthat the rule of the rotation of tensile axis can be explained by cross slip systems; the grains withdifferent initial orientations exhibit different twinning behaviors; the area fractions of extensivetwins have a close relationship with Schmid factors of tensile twinning, and with the angle betweenc-axis and tensile axis of the grains
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.87.pdf
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  • 138
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    Analytic Prediction of Structural Stress-Strain Relations of Microstructured Metal (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 83-86 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nanostructured and ultra-fine grained metals have higher strength but extremely limitedductility compared to coarse grained metals. However, their ductility can be greatly improved byintroducing a specific range of grain sizes in the microstructures. In the paper, multiscale unit cellapproach (UCA) is developed and applied to predict the averaged stress-strain relations of the multiscalemicrostructure metals. The unit cell models are three-phase structured at different scalelengths of 100 nm, 1 μm and 10 μm with different volume fractions and periodic boundaryconditions. The contributions of multi-scale microstructures to the macroscopic structural propertiesof metals are also studied using a analytic approach—two-step mean-field method (TSMF), wherethree microstructural parameters are introduced and thus mechanical properties such as strength andductility are presented as a function of these parameters. For verification of these proposednumerical and theoretical algorithms, the structural properties of the pure nickel with three-grainmicrostructures are studied and the results from FEA and the proposed theory have good agreement
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.83.pdf
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  • 139
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    Micro Impact Testing of Lead Free Solder Joints (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 99-102 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents data obtained from a newly-developed instrument to test the qualityof solder interconnections at high strain rate – the ‘micro-impactor’. This shear test of theinterconnection at high strain rate mimics the stress experienced by the solder joint whenundergoing shock due to drop-impact. Instrumented with a load cell and linear variabledisplacement transducer (LVDT), it also has the ability to provide dynamic impact force anddisplacement data. Earlier concepts to characterise the solder joint at high strain rates such as theminiature pendulum impact tester [1] lacked this capability. This micro-impactor was used to studythe effect of increasing silver (Ag) and copper (Cu) concentration in solder alloys on the shearstrength of the solder joint. The performance of these lead-free alloys was also compared to that ofthe well-established leaded solder. It was found that increasing the silver content increases the yieldstrength of the solder, causing the failure to occur at the brittle intermetallic layer instead of in thebulk of the solder
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.99.pdf
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  • 140
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    Evaluating Multi-Delamination of Composite Laminates Using an Active Sensor Network (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 103-106 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A quantitative evaluation approach for multi-delamination in fibre-reinforced compositelaminates was developed, in virtue of a built-in active sensor network. The approach, conductedhierarchically by activating different sensors in a sensor network, fused time-of-flight (ToF) extractedfrom signals at different levels, whereby to provide an overall consensus as to all possible instance(s)of damage in the laminates. Benefiting from the network, the dependence of evaluation on a specificsensor or signal was furthest minimised, and the need for interpreting complex signal involvingscattering by multi-damage was avoided. The approach was validated by assessing the locations andshapes of dual-delamination in a CF/EP woven laminate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.103.pdf
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  • 141
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    Optical and Piezoelectric Properties of ZnO Nanowires and FunctionalPolymer-Based Nanocomposites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 107-110 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Molecular dynamics simulations are employed to study electronic and mechanicalproperties of smallest ZnO nanowires. It has been shown that the electronic band structure ofnanowires varies with uniaxial strain and this property can be used for sensing deformation statewhen nanowires are embedded in a polymer matrix. A new atomic strain concept is formulated thatallows calculation of continuum quantities directly within a discrete atomic (molecular) system.Molecular modeling and strain calculations have been performed on ZnO/polypropylenenanocomposites and compared with a carbon nanotube/polypropylene system. The simulation cellof nanocomposite has been subjected to uniaxial tension along an inclusion axis and the analysishas been performed for seven deformation steps with equilibration runs after each step. Both nanoinclusionsfollow global nanocomposite strain to a certain loading and then both exhibitdeformation lag as loading level increases. This is clear evidence that both systems are prone tointerfacial sliding. The sliding is more significant with the ZnO nanowire as compared to carbonnanotube, which is also evidenced in weaker interaction of this system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.107.pdf
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  • 142
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    Tough Hypereutectic High Chromium White Iron – A Double 〈i〉In Situ〈/i〉 Fibrous Composite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 111-114 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A tough hypereutectic high chromium white iron has been developed by considering thealloy as a double in-situ fibrous composite and applying the principles of composite theory. Theeutectic in the ternary Fe-Cr-C system solidifies as M7C3 carbide rods of irregular hexagonal crosssection in a matrix of austenite. The carbide rods are intermittently joined together with nomisorientation at the joint. The colonies (eutectic grains) of a 27%Cr alloy solidify with a flat solid– liquid interface. In hypereutectic high chromium white irons the primary carbide solidifies assingle crystal rods with no branching. Depending on the thermal conditions in the mould theprimary carbides are nucleated only on the mould surface, or repeatedly at the solid – liquidinterface. In 27% Cr, 4.5%C hypereutectic alloys, the as-solidified microstructure is one of longparallel aligned primary carbides in a eutectic matrix of carbide rods in austenite, or short randomlyorientated primary carbides in a eutectic matrix. In either case the microstructure can be describedas a double in-situ fibrous composite. The application of composite theory has resulted inhypereutectic high chromium white iron castings with improved fracture toughness similar to thatof heat-treated alloy steel but with superior wear resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.111.pdf
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  • 143
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    Microstructural Analysis on Ti-6Al-4V and 10 Vol.% (TiB+TiC)/Ti-6Al-4V Metal Matrix Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 32 (Feb. 2008), p. 115-118 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Particulate reinforced Ti based metal matrix composites (MMCs) were made by in-situsynthesis using vacuum arc re-melting process. The microstructure of the Ti-6Al-4V base alloy and10 vol.% (TiB+TiC)/Ti-6Al-4V metal matrix composites was examined. The particulatereinforcements were analysed and identified TiB and TiC particles. The particle distribution wasanalysed using the quadrat method over 1620 quadrats. A homogeneous particle distribution wasfound to establish in the composites. The experimental distribution of the reinforcements agreedwell with the theoretical Poisson distribution. A skew factor, which characterizes the degree ofasymmetry of a statistical distribution, of 1.108 was determined for the particle distribution in thematerial
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.32.115.pdf
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  • 144
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    Effective Use of Commercial FEM Software in 2-Dimentional Crack Problems (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 103-108 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Finite element method (FEM) is used widely for various structural problems. However, ingeneral, it is difficult to guarantee the accuracy of results obtained by commercial software of FEM. Inthis paper, a practical finite element technique for calculating the stress intensity factors with highaccuracy is proposed. This technique is based on the characteristics of stress field due to a crack. Inthis study, the proposed method is applied to 2-dimentional crack problems
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.103.pdf
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  • 145
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    Fatigue Analysis for CNG Storage Gas Pressure Vessel Based on ANSYS (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 109-114 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The fatigue destruction is one way of expiration of pressure vessels, In order to avoid theaccident occurring, it is extremely important to carry on the fatigue analysis to the pressure vessels.First, this article introduces the definition of fatigue destruction, the primary factors of affecting thefatigue expiration, and the advantages the analysis principle when the ANSYS finite element isapplied to fatigue analysis; Then, this article carries on the stress analysis based on ANSYS softwareto the CNG storage gas pressure vessel, produces the stress distributed cloud chart, and gets the nodenumber where is the maximum stress; Finally, This article carries on the fatigue analysis based onstress analysis result, the fatigue analysis demonstrates the CNG pressure vessel is effective in theestablishment service life, Its fatigue accumulative damage coefficient is smaller than 1,Whichexplain it can satisfy the fatigue strength request
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.109.pdf
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  • 146
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    Effect of Size and Location of a Weld Defect on Fatigue Life for Argon-Arc Welded Titanium Alloy Joint (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 121-128 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Analytical studies were made on effect of size and location of a weld defect on fatiguelife for argon-arc welded titanium alloy joint. In the analyses, a weld defect was assumed as aninitial crack, and the crack growth life was taken as total fatigue life. By using the Isida andNoguchi’s stress intensity factor solution for a plate containing an embedded elliptical subsurfacecrack under tension, the life prediction code FASTRAN3.9 was revised. A small crack methodologybased on the plasticity-induced crack-closure concept and the effective stress intensity factor range,[removed info]Keff , was used to predict the total fatigue life of welded joint, and to study the effect of the sizeand location of weld defect on fatigue life by means of the revised FASTRAN3.9 code. Limitedamounts of experimental data were used to make comparison with the predictions. The predictedfatigue lives are in reasonable agreement with experiments, and the effect of both the size andlocation of the weld defect on fatigue life was found to be significant
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.121.pdf
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  • 147
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    Uniaxial Ratchetting-Fatigue Interaction of Tempered 42CrMo Steel and its Failure Model (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 115-120 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Uniaxial ratchetting-fatigue interaction of tempered 42CrMo alloy steel was observed byvarious cyclic stressing tests at room temperature. The ratchetting deformation and low cycle fatigue(LCF) property of the material as well as their interaction occurred in cyclic stressing were discussed.It is shown that progressive ratchetting deformation causes the decrease of fatigue life, and the fatiguelife of the material depends greatly upon the applied mean stress, stress amplitude, maximum stressand stress ratio. Since tempered 42CrMo steel presents significant cyclic softening feature, a tertiaryratchetting is observed. Based on the experimental results, a simple and reasonable failure modelconvenient to engineering application was constructed to predict the fatigue life of the material inuniaxial cyclic stressing. The basic variables of the model are maximum stress and stress ratio, andthe effect of cyclic softening feature on the ratcheting-fatigue interaction is also included in the modelby introducing a new variable. It is shown that the predicted lives are in fairly good agreement withthe experimental ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.115.pdf
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  • 148
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    Fatigue Crack Growth Simulation Using S-Version FEM (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 133-138 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Fatigue crack growth under mixed mode loading conditions is simulated using S-FEM. Byusing S-FEM technique, only local mesh should be re-meshed and it becomes easy to simulate crackgrowth. By combining with auto-meshing technique, local mesh is re-meshed automatically, andcurved crack path is modeled easily. Plural fatigue crack problem is solved by this technique. Fortwo parallel crack problem, criteria of crack coalescence are proposed. By simulating this problem byS-FEM, it is verified these criteria are conservative ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.133.pdf
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  • 149
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    The Failure Process Analysis on a Numerical Model of a Branching-Out Tunnel under Lateral Overload Action (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 129-132 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: As the implementations of the western development in China, more and more tunnelswill get through the western mountains in China. In order to economize the construction costs, anew type of underground structural form called branching-out tunnel must be applied. The failureprocess of the branching-out tunnel under lateral overload action is also greatly complicated, whichis related with the depth of the mountains, the branching-out angle, the in-situ stress field, thethickness of the middle wall and so on. This paper uses the 3D-physical model of geo-mechanicalmodel tests to study the stability and failure process of this complicated structure, especially the partof the middle wall. The physical model is built up in a new kind of analogy material. In the processof the whole experiments, different lateral pressures imposed on both of the lateral planes of thephysical model. According to different lateral pressures, we have attained the change of the stressand displacement field and looked into the failure process of the pivotal positions in thebranching-out tunnel. We also use finite element method analysis software RFPA (Realistic FailureProcess Analysis) to simulate the whole failure process of the branching-out tunnel. Finally, wehave got the load-bearing safety reliability of this complicated structure through comparativeanalysis of physical modeling and numerical simulation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.129.pdf
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  • 150
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    〈i〉In Situ〈/i〉 Observation of Fatigue Crack Growth and 90º Domain Switching for BaTiO〈sub〉3〈/sub〉 Ferroelectric Single Crystal under Cyclic Electric Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 145-150 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In-situ observation of the fatigue crack growth and 90o domain switching was carried outfor BaTiO3 ferroelectric single crystals under alternating electric field. It is shown that during theelectric cycling, the crack propagates continuously. Parallel lines of 90o domain boundaries can beseen and they flip at each reversal of the alternating electric field. The width of the 90o domainswitching zone grows with the number of cycles and its frontal always lies ahead of the crack tip. It issuggested that the cyclic stress field induced by the repeated 90o domain switching at the crack tip, aswell as the stress field caused by the electrically activated material between the electrode and thematerial under the electrodes contribute to the observed fatigue crack growth
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.145.pdf
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  • 151
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    Stress Classification and Fatigue Life Assessment of Modular Component with Asymmetric Perforated Parts (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 139-144 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the ASME Code Section III ‘design by analysis’ approach, stresses are determined bynumerical method and compared with corresponding stress limits. This approach provides severalstress criteria for fatigue life assessment and procedures for categorizing the representative stresscomponents. Since the stress criteria were derived from two-dimensional basis, however, it mayinappropriate to delineate structural components with complex geometry. In this paper, detailedtransient analyses are performed for modular pressurizer with an asymmetric geometry, whichincludes perforated parts to mount various piping and equipments. Also, the applicability of aneffective elastic modulus to consider the perforation and the appropriateness of stress linearizationmethod using stress classification line are assessed. Then, the cumulative usage factor as well as stressintensities at critical locations of the pressurizer are calculated and compared with correspondingallowable design stress limits. The key findings of this work can be used to make regulatory guides forevaluation and confirmation of structural intensity of components with asymmetric perforated parts
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.139.pdf
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  • 152
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    Fatigue Life Evaluation of Spot Weldment Using GA and FEM (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 157-162 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: HS40R and EZNCEN are extensively used as components of vehicle bodies because theysatisfy environmental standards and improve fuel ratio. Because vehicle body sheets are becomingthinner and stronger, it is difficult to satisfy the design standards of spot welding joints. This researchpresents the optimization of the welding condition for various welding variables of a spot weldingspecimen by genetic algorithm (GA). After obtaining the optimum welding condition by use of thegenetic algorithm, the fatigue properties of HS40R and EZNCEN spot welded joints are evaluated byusing the finite element method (FEM) to determine the durability and stability of a structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.157.pdf
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  • 153
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    Fatigue Life of Multi-Lap Welding of Automotives Steel Sheet by QSTS (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 151-156 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper shows how the number of lap of spot welded joints in automotive steel sheetschanges the life -cycle transform of itself. There has been significant developments in the lifeextension of automotive steel sheets, as well as in passenger safety. We verified the validity of theS-N curve of materials by QSTS test. Moreover, we used EZNCEN and HS40R, which are commonlyused as automotive steel sheets because of their excellence in increasing fuel efficiency. The purposeof research was to compare the fatigue life of multi - lap of spot welded joints to there. In addition s,we used the two different kinds of sheets together in the same welding under the same condition.Through this whole process, the hypothesis on the life cycle of lethargy coefficients was found to be ingood agreement with the result of the experiment. That is, when using sheets of the same materials inone welding, the fatigue life of two laps of a spot welded joint was found to be much superior byEZNCEN 5~14%, HS40R 17~30%,and when using each sheet of different materials, we found thedecrease in fatigue life by 6~16%. Finally, the best value from the data was chosen based on theexperiment for the analysis of the fatigue life of each layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.151.pdf
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  • 154
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    Experimental Study on the Fatigue Properties of RC Beam Strengthened by Prestressed CFL (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 169-173 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bonding prestressed CFL to strengthen reinforced RC structures can improve the bendingcapability of structures and the working efficient of CFL. Base on the fatigue experiments of 4 RCbeams strengthened by prestressed CFL, the present paper analyzes the fatigue properties ofprestressed CFL reinforced RC beams. Comparing with the experimental results of strengthened RCbeams without prestress, it can be concluded that the prestressed technology can improve thereinforcing effect and fatigue lives
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.169.pdf
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  • 155
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    Experimental Study on Fatigue Life of Steel Beams Strengthened with a CFRP Plate (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 163-168 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The adhesive bonding between the steel beam and carbon fibre reinforced polymer (CFRP)plate is the weakest link and fatigue performance is a major consideration. This paper gives details ofa fatigue test programme of a series of small-scale steel beams bonded with a CFRP plate. Twophases of the fatigue life, including crack initiation life and crack propagation life, are considered.Backface-strain technique was applied to monitor crack initiation. An S-N curve was developed fromthe test results. The curve correlates the maximum principal interfacial stress at the plate end to thecrack initiation life. The fatigue limit of the S-N curve was found to be about 30% of the ultimatestatic failure stress. In accordance with Paris Law, moreover, an equation was developed to predict thenumber of cycles during the crack propagation. The empirical coefficients of the equation wereobtained from the fatigue test results. This equation can correctly predict the crack propagation life.The fatigue load range affects the fatigue life, but its significance is much less than the magnitude ofthe maximum load in the load range
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.163.pdf
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  • 156
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    Crack Growth Life Estimating for MSD Panel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 175-180 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The problem of multiple site damage (MSD) has got more attention in ageing structures.Cumulative effects of interacting cracks may significantly degrade the damage tolerance capacity ofstructures. Cracks caused by MSD are extremely difficult to detect and greatly reduce the residualstrength, fatigue life and overall structural integrity of aircraft panels. This paper presents a simplenumerical method, which use the principles of fracture mechanics and the computation results, topredict the fatigue crack growth life of MSD structure. Comparing with calculating crack growth lifecycle by cycle, this method will save much time. To verify the validity of the proposed method,experiment was conducted and reported with simulation specimen of representative MSD structurewith 5 details. The comparison between the calculated a-N curves and the crack growth lives and thetest results shows that the prediction result with this fast method is acceptable. A discussion wascarried out by numerical analysis; in with typical MSD structures with different initial crack lengthwere adopted. Crack interaction effect was found obviously, but it occurred mainly in the last part ofthe crack growth lives. The relative size of MSD cracks depends significantly on the distribution ofthe initial cracks
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.175.pdf
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  • 157
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    Location of Initial Debonding and Stress Singularity at Interface End (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 315-320 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Interfacial stress distribution of bonded quarter-planes subjected to a concentrated forcewas re-investigated based on Bogy’s solution[1]. The characteristic length of the singular interface end,δ, was defined, and found varying in a very large size scale with the index of stress singularity frommillimeter to nanometer or even smaller scale. The influences the characteristic length scale on theinitial debonding of the interface end is a new question worth to pay attention. Photoelasticityexperiment was employed to verify whether the initial debonding is always located at interface endwith stress singularity. The test results show that the initial debonding does not start from singularinterface end if the index of stress singularity is small enough
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.315.pdf
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  • 158
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    Interaction between a Rigid Cylinder with a Piezoelectric Half-Space with Partial Adhesion (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 333-338 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An axisymmetric problem of interaction of a rigid rotating flat ended punch with atransversely isotropic linear piezoelectric half-space is considered. The contact zone consists of aninner circular adhesion region surrounded by an outer annular slip region with Coulomb friction.Beyond the contact region, the surface of the piezoelectric half-space is free from load. With the aidof the Hankel integral transform, this mixed boundary value problem is formulated as a system ofdual integral equations. By solving the dual integral equations, analytical expressions for thetangential stress and displacement, and normal electric displacement on the surface of thepiezoelectric half-space are obtained. An explicit relationship between the radius of the adhesionregion, the angle of the rotation of the punch, material parameters, and the applied loads is presented.The obtained results are useful for characterization of piezoelectric materials by micro-indentationand micro-friction techniques
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.333.pdf
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  • 159
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    Analysis of the Load-Carrying Capability of the Casing Plug Joint of Steel Tube Structures Considering the Contact Effect (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 321-326 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nonlinear finite element model analysis of the casing plug joints of steel tubular has beenrealized by ANSYS software. The law of load-carrying capability and stiffness of joint are separatelygained by changing the ratio of length and diameter (R/L) and the ratio of the casing length and themain tube length (l/L). The influence of the casing thickness on the load-carrying capability andstiffness are also discussed. The results indicated that the load-carrying capability and stiffness of thejoints both increase with the ratio(R/L) increment and the ratio of the casing length and main tubelength (l/L). When the main tube thickness is equal to casing thickness, the load-carrying capacity ofjoints achieves the most
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.321.pdf
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  • 160
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    Interfacial Fracture Analysis of Adhesive-Bonded Joints (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 327-332 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The failure in an adhesive-bonded structure starts at the interface, and the interfacialfracture is of interest whenever adhesion between different materials is concerned. One of primaryfactors limiting the application of adhesive-bonded joints to structural design is the lack of a goodevaluation tool for adhesion strength to predict the load-bearing capacity of boned joints. Theadhesion strength of composite/steel bonding has been evaluated using interfacial fracture mechanicscharacterization. The energy release rate of a composite/steel interfacial crack was compared with thefracture toughness of the interface, which was measured from bi-material end notched flexure (ENF)specimens, to predict the failure loads of bi-material lap joints. Fracture toughness, IIc G , was regardedas a property of the interface rather than a property of the adhesive. The results show that interfacialfracture mechanics characterization of adhesion strength can be a practical engineering tool forpredicting the load-bearing capacities of adhesive-bonded joints
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.327.pdf
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  • 161
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    Research on Mode I and Mode II Dynamic Fracture in High Strength Steels under High Loading Rates (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 351-356 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Mode I and Mode II dynamic fracture toughness (DFT) values, KId and KIId for highstrength steels 40Cr and 30CrMnSiNi2A were evaluated using a combined experimental-numericalmethod. The tests were performed on three point bend (3PB) and shear specimens with Hopkinsonpressure bar. The time of crack initiation was determined by a strain gauge. With the assistance of3-D transient finite element analysis, the temporal evolution of the dynamic stress intensity factorunder different loading rates was obtained, and the DFT was determined by the fracture initiationtime. In Mode I tests, a brittle transgranular fracture was found in 40Cr, while evidence for ductilefracture was observed on the failure surface of 30CrMnSiNi2A. In Mode II tests, both tensile cracksand adiabatic shear bands were found for the two steels. The effect of ligament size on fracturetoughness was discussed. The correlations of KId and KIId with loading rate were also investigated.The micromechanisms of loading rate effect on the DFT were discussed for both modes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.351.pdf
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  • 162
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    Compressive Properties for Alumina Subjected to Shock Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 345-350 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Alumina have been investigated for its distinguished characteristics to be widely used inarmor application. One-stage light gas gun were utilized to study the dynamic mechanical propertiesof alumina subjected to shock loading. Manganin gauges were employed to obtain the stress-timehistories at the different Lagrange locations in alumina target. The Hugoniot curves of stress andpressure versus specific volume were fitted based on the experimental data. The compressivebehaviors for AD90 alumina are shown to be from elastic to “plastic” below 12GPa and under morehigher pressure it will be transferred to similar-fluid state. Adopting LS-DYNA finite elementcode the dynamic failure of alumina ceramic armor are simulated. It is concluded that nucleationand growth of great number of radial and axial cracks and lateral cracks play dominant role infractured ceramic target under impact loading
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.345.pdf
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  • 163
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    Fracture Analysis for Damaged Aircraft Fuselage Using Substructure Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 29-34 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper primarily describes the development and application of substructurecomputational analysis techniques to determine stress intensity factors for the damaged panelssubjected to fatigue internal pressure. A program based on substructure analysis technique has beendeveloped for the fracture analysis of curved aircraft panels containing cracks. This program maycreate whole model which consists of substructure superelements and obtain fracture parameter of thecrack by expanding results in superelement automatically. For instance, a typical test curved panelmodel consists of 7 frames and 8 stringers is calculated. This numerical approach has been validatedthrough comparison between the calculation SIF results and available experimental data of a typicaltest panel with a longitudinal crack. The technique that has been established here is also applied to theother analysis of a test series of cracked panel with 7 frames and 10 stringers. SIFs of four cracks in itwith different crack lengths are obtained efficiently
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.29.pdf
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  • 164
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    Study on Ductile Fracture Including Shear-Lip Fracture under Mixed Mode Loading Condition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 23-28 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Dimple fracture tests are conducted under mode I and mixed mode lading conditions.Dimple fracture zone and shear-lip fracture zone are observed by scanning electron microscopeprecisely. It is found that crack growth direction is affected largely by the change of loadingcondition. It is also found that the differences of fracture pattern between mid-plane and at freesurface are very large. Void diameter and crack growth direction are measured. Numericalsimulation is conducted to simulate fracture tests in three-dimensional field. Gurson’s constitutiveequation is used and large deformation analyses are conducted. It is assumed that void nucleation iscontrolled by both plastic strain and stress. Numerical results are compared with those ofexperiments. It is found that results of numerical simulation agree well with those of experimentqualitatively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.23.pdf
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  • 165
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    Experimental Investigation of the Size Effects on the Fracture Toughness and Tearing Modulus (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 35-40 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Detailed experiments of fracture toughness in which SENB specimens of five differentthicknesses were included were carried out to investigate the size effect in the ductile to brittletransition temperature region. It is found that the fracture toughness of the upper shelf increases withthe thickness of the specimens with the similar geometry. While the fracture toughness of the lowershelf decreases with the thickness in the range of 4mm to 12mm and then drops up from 12mm to16mm with the appearance of shear lips which present the shearing fracture under the plane stressstate. The tearing modulus dJ/da which determines the resistance to stable crack growth increaseswith the increment of thickness and the reduction of the temperature. The results of the stresstriaxiality increasing with the reduction of the thickness explain well the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.35.pdf
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  • 166
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    Analysis of Interfacial Debonding of RC Beams Strengthened with CFL (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 47-54 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The interfacial bonding property between carbon fiber laminate (CFL) and concrete is akey issue in the application of RC beams strengthened with CFL. In this paper, fracture mechanicsmethod is used to develop a calculation formula of stress intensity factor for the CFL-concreteinterfacial crack. In combination with a series of tests, the interfacial fracture toughness is discussed,and the influencing factors and process of the intermediate crack-induced debonding (IC debonding)are also analyzed. The tests results show that IC debonding is generally induced by the flexural orflexural-shear cracks in the bottom of RC beams around the mid-span, and develop along theinterface towards the end of the beam. A method to determine IC debonding derived from theoreticanalysis and the tests results demonstrates that the interfacial failure can be effectively avoided bylimiting CFL strain in the range of the debonding strain
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.47.pdf
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  • 167
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    Peculiarity of Accelerated Propagation of Fatigue Crack for Medium Carbon Steel under Variable Amplitude Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 181-186 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Low cyclic fatigue testing of 45 medium carbon steel with the annular V-notch indicatesthat the propagation of crack under variable amplitude increase by degrees overloading is fasterthan that under constant amplitude overloading. Some problems which include the effect ofconstant amplitude overloading to propagation speed of crack, the suitable loading process ofaccelerating propagation of fatigue crack, and the fracture figure in suitable loading, should bediscussed. Based on the experimental results and the analysis of the fracture surfaces of thespecimens, the mechanism of propagation of fatigue crack under the overloading is explored. It isproposed that at the moment of the application of the overloading, the obvious instantaneousincrease of crack growth rates is due to crack blunting. Then an adequate way of loading to makepropagation of crack quickly is found that provide a basis for the engineering application ofextra-low cycle fatigue fracture
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.181.pdf
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  • 168
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    Evaluation of Fatigue Crack Growth of Interacting Surface Cracks (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 187-198 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Since mechanical interaction between multiple cracks affects the rate of crack growth dueto fatigue and stress corrosion cracking, it is important to consider its influence when predictinggrowth. In this study, a procedure predicting the growth of interacting surface cracks was developed.First, using the results of fatigue crack growth tests performed in a previous study, the transientgrowth behavior during coalescence and growth under interaction was evaluated based on area ofcrack face. It was shown that the area is a representative parameter of the growth of interacting surfacecracks as well as independent cracks. The growth in area showed good correlation with the crackdriving force defined using size of area. Then, in order to investigate the relationship between growthof interacting cracks and their relative spacing, crack growth simulations were carried out. The bodyforce method was used to evaluate the change in stress intensity factors (SIF) during crack growthunder interaction, and the simulation could reproduce the crack configurations obtained in the fatiguecrack growth test. SIF of an interacting crack tip converges to that of a coalesced crack as the distancebetween cracks decreases. It was concluded that when the distance between cracks is small enough,the cracks can be replaced with a semi-elliptical crack of the same area of crack face for a growthevaluation. The threshold offset distance for the replacement was suggested to be less than 0.1Rx,where Rx is the span length of two cracks on the surface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.187.pdf
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  • 169
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    Prediction of the Fatigue Life Based on Stiffness Degradation Concept (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 199-204 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to predict the fatigue life of matrix-dominated polymer composites, a new modelbased on stiffness degradation concept was proposed. The effect of off-axis was considered bydefining a non-dimensional modified stress level, and the expression of fatigue stress limit could beprovided in the new model. Based on the fatigue tension-tension experiment of PI/SiO2 hybrid thinfilms under different stress levels, the simulated results was confirmed to be well agreeable with theexperimental data
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.199.pdf
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  • 170
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    Fatigue Analysis of Locking Parts in the Gauge-Adjustable Wheelsets System Considering the Variation of the Fatigue Strength (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 217-222 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To reduce the cost and time of transport due to the different track gauges(narrow, standard,broad) in the Eurasian railroad network such as TKR(Trans-Korea Railway), TCR(Trans-ChinaRailway) and TSR(Trans-Siberia Railway), it is very necessary to develop and adapt thegauge-adjustable wheelsets system. The freight trains’ with gauge-adjustable system could operate onthe different track gauges in the transcontinental railway. Therefore, to assure the safety of the newlydeveloped gauge-adjustment wheelsets system, it is essential to evaluate integrity of locking parts inthe system by using fatigue analysis. In this study, it was performed that contact stress analysis oflocking parts by using FEM(Finite Element Method) in the case both the gauge changeover operationand freight trains' service in the curved track, respectively. Besides, to consider the variation of fatiguedata, the crack initiation life was statistically evaluated
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.217.pdf
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  • 171
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    Study of Initiator’s Shock-Resistibility Through Impact Using Hopkinson Pressure Bar (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 401-406 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper attempted to study the properties of Slapper detonator non-energetic elementsthrough exerting impact on them by Hopkinson Pressure Bar and evaluating the acceleration thatsamples received in accordance with one-dimensional stress wave theory. The results showed that thevelocity pulse width could be controlled and acceleration pulse width be improved by varying thepulse shaper material and strike bar length. And the critical acceleration causing the failure of theinitiator was closely connected with acceleration pulse width as well as acceleration amplitude. Whenthe strike bar length were 126 mm, 190 mm, 270 mm and 460 mm, the acceleration pulse width were58 μs, 93 μs, 130 μs and 160 μs, respectively, and the critical acceleration causing the failure of theinitiator were about 240 000 g, 130 000 g, 74 000 g and 72 000 g, respectively. The accurateness andreliability of acceleration value was accredited to the methods of changing sampling frequency,smoothing velocity and acceleration curve, and fitting curve. The FEM analog simulation was alsoconducted by using the LS-DYNA finite element program. Good agreements were achieved betweenthe acceleration curve and the simulation results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.401.pdf
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  • 172
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    Effect of Load Direction on Crack Propagation in High-Temperature Fatigue of Directionally Solidified Superalloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 205-216 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Directionally solidified (DS) superalloys, which have elongated large grains, are used forgas-turbine blades. Since the grain size is not small enough in comparison with the crack sizeobserved often in a real component, the inhomogeneous microstructure due to the aligned grains maystrongly affect the crack propagation property. Center-cracked-plate specimens with three differentorientations, TP0 with the parallel DS axis to the load, TP90T with the perpendicular DS axis to theload and the crack propagation direction, and TP90L with the perpendicular DS axis to the load andparallel to the crack propagation direction, are subjected to high-temperature (1143K) fatigue. Thespecimens after the tests show the transgranular cracking perpendicular to the load axis in TP0,intergranular one parallel to the DS axis in TP90L, and intergranular / transgranular one parallel to theDS axis in TP90T. The crack propagation rate da/dN shows a good correlation with effective stressintensity factor range [removed info]Keff in each cases. However, the magnitude of da/dN at a same [removed info]Keff in TP90Lis relatively higher than that in TP0, and that in TP90T remarkably fluctuates. A microscopicobservation of TP90T reveals that the high da/dN is caused by the intergranular cracking, while thelow da/dN is observed on the transgranular cracking. A procedure for the prediction of crackpropagation is proposed on the basis of the two types of cracking; transgranular and intergranularcracks perpendicular to the load axis. The validity of the proposed procedure is discussed by thecomparison of tested and predicted results of crack propagation in a fatigue condition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.205.pdf
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  • 173
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    Fatigue Behaviors of a NiCrAlYSi Coated Directionally Solidified Nickel Base Superalloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 229-236 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The fatigue behaviors of a directionally solidified (DS) nickel base superalloy, coated witha MCrAlY coating (NiCrAlYSi) were studied. Two kinds of tests were performed. One kind of testsare low cycle fatigue (LCF) test under strain control at different temperatures, another kind of testsare stress controlled LCF test with SEM-servo hydraulic testing machine for in situ crackingobservation. The results show that the effect of coating on LCF life of coating/substrate system wasrather different according to different strain levels and temperatures. The coating has no or less effecton LCF life under high strain range and the LCF life is governed by fatigue behavior of substrate inspite of the difference of temperature. However, when strain range is smaller, crack initiation andpropagation are observably affected by temperature, which leads to a shorter LCF life ofcoating/substrate system at 500ºC and a longer LCF life at 760ºC or 980ºC. This means the failure ofcoating/substrate system is dominated by the cracking of surface coating under low strain range. Thebrittleness at 500ºC lower than DBTT results in rapid stage II crack propagation. The crack initiationfrom coating surface was in situ observed at room temperature and 700 ºC and it was found thatcracks usually initiated from the surface roughness of coating and then propagate to failure. Thebrittleness and surface roughness are the basic acceptable causes leading to the early damage of acoating/substrate system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.229.pdf
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  • 174
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    Study of Fretting Fatigue Crack Initiation For Riveted Al 6xxx Components (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 243-248 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Riveting is a procedure widely used for fitting together two or more elements of astructure, that could be of the same or different material. In these assemblies the stress field iscomplex and a number of parameters, including effect of the geometrical discontinuities, contactbetween elements, tightening, material properties and applied load must be considered. The currentwork focuses on the study of fretting fatigue crack formation in common 6XXX aluminum alloys,used in land transportation equipments, and the determination of the characteristic crack initiationsites by means of both experimental and numerical methods. 3D finite element models were validatedby the experimental results obtained with strain gauges. The influence of the contact frictioncoefficient at the fretting surface and fastening forces on the initiation of cracks, are discussed by thecomparison of the different numerical results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.243.pdf
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  • 175
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    Shrinkage Cracking Test and Analytical Model for Concrete Considering Creep Behaviour at Early Age (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 435-440 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Cracking due to the restrained shrinkage stress has been frequently observed at early age inconcrete construction. The early-age shrinkage cracking reduce the structural performance of concreteand may accelerate deterioration to shorten the service life. Two kinds of strategies andinstrumentation have been developed to assess early age cracking: ring tests with a restraining core,longitudinal tests where the restraint is at the end grips of the specimen. Early-age concrete exhibitscreep or relaxation behavior that is a typical response of viscoelastic materials. Viscoelasticconstitutive model should be used to analyze stress development of the restrained concrete. Theassessment of the risk of cracking can be based on the model with input of the estimated concretedeformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.435.pdf
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  • 176
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    Numerical Simulation of Void Growth Induced Creep Rupture in HAZ at Elevated Temperature (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 441-448 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In structural welded joints after long-term service under elevated temperature, fractureoccurred mainly in the heat affected zone (HAZ). Recently, the nucleation and growth of creep voidsin the fine-grained HAZ of weldments, recognized as Type IV fracture, has become an importantproblem for ferritic heat resisting steel. In this paper, a new computational model was presented toanalyse the void growth induced creep damage development in HAZ. The new constitutive modelbased on continuum damage mechanics (CDM) equations is combined with amicromechanism-based model in order to account for the void growth process, which is differentfrom the previous studies of creep damage. Material properties used for the creep damagecomputations are fitted from actual creep test data. Basic benchmark tests were performed to verifythe new computational model. Then the model was used to study the creep damage development inthe welded joints where four different material properties, base material, coarse-grained HAZ,fine-grained HAZ, and weld material, are taken into account. The numerical simulation results forcreep lifetimes agreed well with the experimental results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.441.pdf
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  • 177
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    Dynamic Behavior of Tungsten Alloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 449-454 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The plate impact experiments have been conducted to investigate the dynamic behavior of91W-6.3Ni-2.7Fe. Lagrangian analysis technique was introduced to discuss the mechanical propertiesof the tungsten alloys under high strain rate and the stress-strain curves of the tungsten alloys weregiven. Based on the experimental observations, the three-dimensional finite element models ofprojectile and tungsten alloy target are established by adopting ANSYS/LS-DYNA, Dozens of caseswere performed to investigate the dynamic mechanical behavior of tungsten alloy target under impactloading. A good agreement between numerical predictions and experimental results was obtained,which suggests that the finite element model is efficient and credible to simulate the mechanicalproperties of tungsten alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.449.pdf
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  • 178
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    Influences of RE-Ti Composite Modification on the Structure and Properties of W6Mo5Cr4V2 Alloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 455-458 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The structural change and properties of W6Mo5Cr4V2 alloy (M2 steel) inoculated byaddition of rare earth (RE)-Ti were investigated. The results indicated that the impact toughness andfracture toughness were increased distinctly due to network eutectic carbides elimination, matrixstructure refinement, and well-distribution of eutectic carbides. The hardness of modified M2 steelhardly changed. In addition, the high temperature wear resistance was improved
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.455.pdf
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  • 179
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    Experimental and Numerical Simulation of the Mechanical Behavior of Stratospheric Balloons Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 597-602 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The school of aerospace of Tsinghua University has started a project to develop new kindof stratospheric balloons for earth observation. These balloons will be designed to stand in the sameposition during a few days at 20 kilometers of altitude. To reach this goal, the first step is to selectadapted materials for the balloon envelope. The materials for stratospheric balloons applicationshould have specific properties adapted to the environment such as mechanical, thermo-optical, andpermeability properties. Thus, we have asked a material manufacture company to develop andmanufacture a material adapted to our application. In this paper, we will present the first resultsconcerning the mechanical properties of the material. Experimental facilities have been developed totest the mechanical behavior of the materials at room and low temperature. The future development ofthe project will be to identify behavior law adapted to our material that fits with the experimentalresults
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.597.pdf
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  • 180
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    Jet Projectiles Penetration into Multilayer Metal Targets with Large Interval (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 603-608 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: At long standoff, a shaped charge with small cone angle will produce a jet with a high tipvelocity and a low tail velocity, causing it to stretch and break up, so its penetration ability intomultilayer metal targets is very weak, while the penetration depth of explosively formed projectiles istoo low to penetrate into multilayer metal targets. On account of this, the large cone angle shapedcharge, whose internal cone angle is about 100 degree, is proposed and designed in the paper. Thesensitivity of penetration effect into targets to the cone angle of the liner is investigated by experiment.The results reveal that the shaped charge penetration into multilayer metal targets with large intervalis more optimistic than that of the shaped charge with small cone angle and explosively formedprojectiles. In numerical simulation, based on interface tracking algorithm known as markers on cellline to reconstruct material interfaces, jet penetration into metal targets is simulated in atwo-dimensional multi-material Eulerian code. The numerical results are in good agreement with theexperimental ones and also indicate the interface tracking algorithm has much better resolution formoving interfaces, especially effective for large deformation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.603.pdf
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  • 181
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    Model Testing and Analysis Study on Shear Strength of Rock Mass Containing Multiple Cracks under Compression-Shearing Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 617-622 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two-phase modelling testing was performed to study the shear strength of rock bridges ofjointed rock mass in this paper. The failure process of rock sample containing multiple collinearcracks was observed. Based on theory of fracture mechanics and analytical method, a rock-bridgefailure model was proposed and the expression of shear strength was derived. Comparison ofcalculated shear strength and the model test results was made and they agree well
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.617.pdf
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  • 182
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    Numerical Simulation of Different-Shaped Random Aggregates’ Influence on Concrete’s Compression Strength (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 623-630 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A three-phase composite material specimen consisting of aggregates, mortar matrix andtheir bonding material is created through the Monte-Carlo method. The Mazars isotropic damageevolution model is used to describe the meso-mechanics damage deterioration of concrete. And thefinite element method is adopted to simulate respectively the uniaxial compression numericalmodels of two, three and full graded specimens with sphere and polyhedron aggregates. Followingare the conclusions from the test results: the ultimate load capacity of arbitrary polyhedronaggregate specimen is greater than that of the sphere one of the same grade; the size effect lawexists in these numerical models of concrete specimens; the stiffness of the polyhedron aggregates’specimen of the same grade is greater than that of the sphere ones’, and the softening curves of thesphere aggregate model are easier than those of the polyhedron by comparison in the softeningphase of stress-strain curves
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.623.pdf
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  • 183
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    Modeling of Stress-Induced Permeability Evolution and Damage of Rock (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 609-616 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Rock permeability is important in civil and geo-hydraulic engineering, the mining andpetroleum industries, and in environmental and engineering geology. In this paper, considering themutual hydro-mechanical response between stress-induced permeability and damage, a coupledmathematical model for solid deformation and gas flow in the coal or rock was established and anattempt is made to investigate the rock permeability evolution, fracture patterns, and flow vectors inrock samples at the scale of usual laboratory samples as well as the relation between permeability andstress induced damage in connection with the complete strain-stress process of loaded rocks.Numerical simulations show that the permeability of rock was not constant, closely related to thestate of stress, but varied with the stress and strain states in the rocks. Microcracking, resulting fromthe concentration of stress on relatively weak rock elements, triggers successive crack initiation andpropagation that in turn leads to permeability enhancement. Prior to the peak strength, thepermeability decreases with increasing load. A dramatic increase in permeability occurs in thepost-peak stress-strain region due to the catastrophic collapse of microstructure in rock. Moreover,the permeability of rock in post-peak stress-strain region is much higher that that of in pre-peakregion. Such intensive studies of gas flow in stressed heterogeneous rocks are useful as initialapproaches to many engineering problems in mining and petroleum industries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.609.pdf
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  • 184
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    Effect of Non-Homogeneity on Limit Bearing Capacity of Rock Block (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 631-638 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Rock is a typical non-homogeneous material. The behavior of a rock block undercompression and the process of micro-fracture in that block are phenomena of considerable interest inunderstanding the strength characterization of brittle rock. In this study, the effect of thenon-homogeneity on limit bearing capacity of rock block based on Rock Elasto-Plastic FailureProcess Analysis code (REPFPA) are simulated and investigated. Numerical simulations find out thatthere exists a functional relation between the heterogeneity coefficient and the limit bearing capacityof rock block. For specimens with the same heterogeneity, however, the numerical simulations showthat the failure modes depend greatly on the crack initiation location, which is found to be sensitive tothe local disorder features within the specimen. In addition, the characteristics of acoustic emissionswith the changing of heterogeneity coefficient were also found. These identifications are crucial forbetter understanding and interpreting the experimental results and consequently, improve ourconcepts in design or analysis of rock engineering structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.631.pdf
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  • 185
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    Coupled THM Model and Simulation of the Yucca Mountain and FEBEX Case Study within DECOVALEX-THMC Framework (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 639-644 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Task_D of the DECOVALEX_THMC project focus on predictive analysis of the long-termcoupled processes(up to 10,000 years) in two generic repositories, FEBEX type and Yucca MountainProject type for comparison. To better understand the coupled THM processes and their influence onthe system behavior, we have introduced a set of generic coupled THM governing equations. Basingon these equations, we develop simplified models according to given Task_D model inception phaserequest. Boiling model and empirical bentonite swelling model are introduced into generalsimulation which makes model more practical. Our numerical code FRT-THM upon this practicalmodels is developed and used in two BMT case study of Task_D. Simulation results are shown andverified in the 3rd and 4th workshop of DECOVALEX_THMC in 2005. There is a good agreementwith results of different participant teams which enhances confidence in prediction of coupled THMprocesses
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.639.pdf
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  • 186
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    Concrete Durability Test Due to Environmental Degradation Using Environment Simulation Technology (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 651-656 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Using environment simulation technology, simulation testing for environmental behaviorof concrete structure could be developed. Concrete durability experiment and its relative theoryresearch would be progressed, and it play an important role in ensuring security and durability ofstructures. Tailoring environment tests are discussed in the paper, as well as determining all kinds ofenvironmental factors of durability experiment and constructing several coupling environment.Simulation tests for environmental behavior of concrete structure will be developed based on thestudy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.651.pdf
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  • 187
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    The Thermo-Hydro Coupled Model of Low-Temperature Rock In Consideration of Phase Change (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 645-650 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Considering the influence of phase change and temperature variation on the physical andmechanical properties of low-temperature rock in cold regions, the mathematical model for theThermo-Hydro(TH) coupled problem is proposed based on the theory of convective heat transferfor porous medium. In this model, the influence of moisture migration on heat conduction in rock istaken into account, as well as the influence of temperature gradient on the seepage. The involvedparameters are determined according to the related equations given in this paper. Then the finiteelement model of a gas transmission pipeline in cold region is established using the proposedmathematical model. By selecting suitable boundary conditions, initial conditions and heatcomputation parameters, the freezing problem of low-temperature rock surrounding the pipeline isanalyzed. The calculated values of the temperature field and the measured data are basicallyconsistent, which indicates that the proposed TH coupling model for rock in cold regions isreasonable and reliable
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.645.pdf
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  • 188
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    A Constitutive Model of Anchored Jointed Rock Mass and its Application (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 657-662 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The jointed rock mass distributed in the nature widely and its mechanical characteristicinfluenced the stability of the rock engineering badly. The cracks propagated and coalesced eachother and macroscopic failure happened. Bolts were a kind of effective reinforcement instrumentand they could prevent the cracks from propagating. However, the anchoring mechanism of boltswas not realized clearly and their reinforcement could not be reflected effectively in the numericalsimulation yet. Based on the damage mechanics, a constitutive relation and damage equation ofanchored jointed rock mass were presented in this paper. With a project application, the model wasproved to be feasible one
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.657.pdf
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  • 189
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    Study On the Damage Evolution Equation of Rockburst (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 663-668 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper introduces the principle of minimum energy dissipation and its generalprocedures to establish development equation of internal variable. With the accepted viewpoint thatthe damage is only mechanics of energy dissipation during the rockburst and utilizing the totalstrength criterion based on released strain energy, the general damage evolution equation is deduced.Compared with the traditional research method of damage evolution equation, this method hasuniversal and objective characteristics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.663.pdf
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  • 190
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    Deformation Analysis of Shape Memory Alloy Using SEM Scanning Moiré Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 675-680 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, scanning electron moiré method is used to measure the mechanical behaviorof Ferro-based shape memory alloys(SMA). The moiré patterns are formed by the interferencebetween a 1000 lines/mm cross-type specimen grating (which is fabricated using electron beamlithography) and the scanning lines of Scanning Electron Microscope (SEM). When the specimen issubjected to uniform tension load at the room temperature, the unloading residual strain values in thedifferent regions under the same tensile load and the values in the same region under different tensileloads are compared respectively. The shape memory effect is also studied. From the experimentalresults, it can be concluded that the proposed moiré method is highly accurate to measure themechanical behavior of microscopic field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.675.pdf
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  • 191
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    Study of Mechanical Properties of the Spider Silk Using a Micro-Tensile System and DIC Methods (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 681-686 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The spider silk is considered as a new type of biomaterials with its excellent mechanicalproperties. The mechanical properties of the spider silk are crucial to their applications. In this studythe mechanical properties of spider silk were studied with a micro-tensile system driven bymagnet-coil force actuator, which is very effective to measure the properties of low dimensionalmaterials. The Young’s modulus of the spider silk is obtained, the relationship between themechanical properties of spider silk and time is also acquired
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.681.pdf
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  • 192
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    Effect of Initial Stress on the Behavior of Love Waves in an Elastic Half-Space with a Functionally Graded Layer (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 669-674 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The propagation behavior of Love waves in a functionally graded material layeredhalf-space with initial stress is taken into account. The Wentzel-Kramers-Brillouin (WKB)asymptotic technique is adopted for the theoretical derivations. The analytical solutions are obtainedfor the dispersion relations and the distributions of mechanical displacement and stress alongthickness direction in the layered structure. Firstly, these solutions are used to study effects of theinitial stress on the dispersion relations and phase velocities, then influences of the initial stress on thedistributions of mechanical displacement and shear stresses along thickness direction are discussed indetail. Numerical results obtained indicate that the phase velocity of Love wave increases with theincrease of the magnitude of the initial tensile stress, while decreases with the increase of themagnitude of the initial compression stress. The effects on the dispersion relations of the Love wavepropagation are negligible as the magnitudes of the initial stress are less than 100MPa. Some otherresults are shown for distributions of field quantities along thickness direction. The results obtainedare not only meaningful for the design of functionally graded structures with high performance butalso effective for the evaluation of residual stress distribution in the layered structures
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.669.pdf
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  • 193
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    The Moving Crack Problem of Orthotropic Functionally Graded Materials under Antiplane Loading (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 687-692 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Dynamic problems of Yoffe mode crack are studied under antiplane shear impact ininfinite orthotropic functionally graded materials. The shear modules in two directions are assumed tovary in terms with power function form of dual parameters of arbitrary time power. By using integraltransform-dual integral equations method, the stress field and dynamic stress intensity factor nearcrack tip are obtained. And the influences of material in homogenous coefficient and gradedparameters and crack moving speed to dynamic stress intensity factor are analyzed in virtue of Matlabsoftware. Results show that the dimensionless dynamic stress intensity factor will decrease with theincrease of moving speed of crack, which is opposite to the result of the dynamic problem of infinitestrip in FGM. And the dimensionless dynamic stress intensity factor will decrease with the increase ofgraded parameters and rise with the increase of material in homogenous coefficient
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.687.pdf
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  • 194
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    Growth Characteristic and Fracture Toughness of Laser Rapidly Solidified Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉/YAG/ZrO〈sub〉2〈/sub〉 Ceramic Eutectic 〈i〉In Situ〈i〉 Composite (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 495-500 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Directionally solidified oxide ceramic eutectic composites with superior strength,oxidation resistance, creep resistance, structural stability and low sensitivity to crack at hightemperature have aroused much attention in recent years, and various preparation techniques havebeen developed. In situ fabrication of ceramic eutectic composites by laser rapid solidification is acheap and quick method compared to conventional multi-step fabrication methods of fiber reinforcedcomposites for high temperature use. In this paper, Al2O3/YAG/ZrO2 ternary eutectics are rapidlyprepared from melt by directional solidification using laser zone remelting technique, the growthcharacteristic and fracture toughness are investigated. The results show that: (1) Laser rapidlysolidified Al2O3/YAG/ZrO2 ceramic eutectic in situ composite presents a fine interpenetratingnetwork structure, in which Al2O3, YAG and ZrO2 phases are continually interconnected and finelycoupled without pores, colonies and grain boundaries between interfaces. (2) Laser scanning rate andpower density strongly affect the eutectic growth. With the processing parameters adjusted properly,the eutectic shows homogeneous and coupled lamellar microstructure. The characteristic dimensionsof the microstructure are around 2~3 1m for Al2O3 and YAG phases, and around 0.2~1 1m for ZrO2phases, respectively. (3) The hardness and fracture toughness of the rapidly solidifiedAl2O3/YAG/ZrO2 eutectic are 16.7 GPa and 8.0 MPa.m1/2, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.495.pdf
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  • 195
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    Characterization of Expanded Graphite/Flake-Type Graphite Filled Conductive Polymer Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 515-520 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conductive polymer composites (CPCs) consisting of expanded graphite (EG), flake-typegraphite (FG) and thermalsetting resin were fabricated by means of a preform molding technique.Conductive fillers, EG and FG, were mechanically mixed with the phenol resin to provide anelectrical property to composites. The filler loadings were fixed at 75wt.% to obtain a high electricalconductivity. The mechanical and electrical properties of CPCs were optimized according to theweight ratio and the particle size of FG. As the weight ratio increased, the flexural strength increased,however, the electrical conductivity decreased for both cases of CPCs using different sizes of FG. Theparticle size was an important parameter to change the mechanical and electrical behaviors. Theflexural strength was sensitive to the particle size due to the different level of densification. Theelectrical conductivity also showed size-dependent behavior because of the different contribution tothe conductive networking
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.515.pdf
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  • 196
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    Study on Softening Property of 30Cr1Mo1V Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 521-526 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Softening, namely degradation, is an important characteristic for the componentslong-termly operating in high temperature environment. In this article, hardness is adopted to indicatethis effect. In order to study the independent effect of high temperature and stress on the materialproperties, the zero-stress ageing experiments at 540 oC, 565 oC, 660 oC and the stress-acceleratingsoftening experiments (i.e. creep experiment) at 540 oC, 565 oC with interruption were carried out insteel 30Cr1Mo1V, respectively. The stress range tested was from 240MPa to 320MPa. The Vicker’shardness was measured. The relationship between Larson-Miller parameter and the Vicker’s hardnessunder zero-stress softening condition and under stress-accelerating softening condition is obtained.Based on the extraction of the effects of temperature and time, the stress softening effect formulae areestablished
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.521.pdf
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  • 197
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    The Plane Problem Solution of Piezoelectric Material with a Line Crack (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 533-538 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A two-dimensional electromechanical analysis is performed on a transversely isotropicpiezoelectric material containing a line crack of length 2a, which is subjected to uniform distributedforces with intensity q along the crack faces and uniform electric displacement fields at infinity.Based on the impermeable electric boundary conditions, the closed complex form expression for theelectromechanical fields are deduced in the vicinity of the crack. Taking PZT-4 ceramic intoconsideration, electromechanical fields under different loads are illustrated through several examples.It can be seen that electromechanical fields show 1/2 order singularity at the crack tip, and thepiezoelectric effect can’t be negelected
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.533.pdf
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  • 198
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    Effect of Austenitizing Temperature and Air Cooling Rate on Microstructure and Properties of the Low Carbon Mn-Si-Cr Steel (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 527-532 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The air cooling rate of the Low Carbon Mn-Si-Cr steel bar with different diameter afteraustenitizing at 910oC and 960oC was simulated by Formaster-F Phase transforming instrument andGleeble-1500 thermal /mechanical simulating machine. Microstructure of the specimen was observedby OLYMPUS PME3 optical microscope and FEI QUANTA200F scanning electron microscope. Thehardness and impact toughness of the steel was tested by HBRV-187.5 hardness tester and JCSJ300-Iinstrumented Charpy impact tester. The experimental result showed that with the amount of CFB inCFB+M mixed microstructure increasing the combination of strength and toughness of the steel wasimproved. The higher the austenitizing temperature of the steel, the wider the air-cooling rate rangeobtaining CFB+M mixed microstructure. However, the steel produces mixed grain after austenitizingat 960 oC. For obtaining fine prior austenite grain size, Ti and Nb alloying element need to be added
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.527.pdf
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  • 199
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    Plane Electromechanical Fields in a Piezoelectric Material Containing an Elliptical Hole (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 539-544 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A two-dimensional electromechanical analysis is performed on a transversely isotropicpiezoelectric material containing an elliptical hole, which is subjected to uniform compressiveforces with intensity q acting on the edge of the hole and uniform electric displacement fields atinfinity. Based on the impermeable electric boundary conditions, general electromechanical fieldssolution are obtained in the form of complex potentials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.539.pdf
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  • 200
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    Strength Behaviour of Polysilicon Thin Film Flexure Hinge (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 545-552 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This work reports on strength behaviour of polysilicon thin film flexure hinge. In order todevelop a microscopic modelling of thin film flexure hinge for microstructures, in situ test bencheshave been designed and fabricated. The experiment demonstrated that a deviation between themacroscopic theory value and experimental result. A model similar to that used for rotational stiffnessin macroscopic steel is used to fit testing data for polysilicon film flexure hinge. The dynamiccharacteristic and fatigue behaviour of the thin film flexure hinge were also investigated. The hingewas excited by an integrated electro-thermal microactuator that could be self-heated and driven.Resonant frequency of the polysilicon flexure hinge test benches is 6.5 Hz, and the maximumoperating frequency reached 1KHz. When a cyclic loading of 1μN.μm was exerted to themicromachining flexure hinge, the limit stress alternation number exceed 1.0×108. When the stressalternation number exceeded 1.0×109, the polysilicon beam of microactuator would lost its elasticcharacter. If the micro hinge operated at high temperature (exceed 200/), the lifetime woulddecreased. If the working temperature were too high, the micro hinge would be burned out
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.545.pdf
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