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  • 1
    Electronic Resource
    Electronic Resource
    Three-Dimensional Elastic-Plastic Finite Element Analysis of Biaxially Loaded Cracked Plates (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 699-704 
    Details
    ISSN: 1013-9826
    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 detailed two-dimensional (2-D) and three-dimensional (3-D) finite element (FE)analyses, this paper attempts to quantify in-plane and out-of-plane constraint effects on elastic-plastic J and cracked tip stresses for biaxially loaded plate with a through-thickness crack and semi-elliptical surface crack. It is found that the reference stress based approach for uniaxial loading can be applied to estimate J under biaxial loading, provided that the limit load specific to biaxial loading is used, implying that quantification of the biaxiality effect on the limit load is important.Investigation on the effect of biaxiality on the limit load suggests that for relatively thin plates with small cracks, in particular with semi-elliptical surface cracks, the effect of biaxiality on the limit load can be neglected, and thus elastic-plastic J for a biaxially loaded plate could be estimated, assuming that such plate is subject to uniaxial load. Regarding the effect of biaxiality on crack tip stress triaxiality, it is found that such effect is more pronounced for a thicker plate. For plates with semi-elliptical surface cracks, the crack aspect ratio is found to be more important than the relative crack depth, and the effect of biaxiality on crack tip stress triaxiality is found to be morepronounced near the surface points along the crack front
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.699.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    A Study on Flow Performance of Axial Inlet Cyclone for Dust Collector (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1321-1324 
    Details
    ISSN: 1013-9826
    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 study, numerical analysis to develop optimal dust collector having an axial inletcyclone was performed for the 3 dimensional flow field with a control volume including gases andparticles. We applied FVM(Finite Volume Method) for calculating the flow distribution and thepressure drop into the control volume using a commercial code FLUENT. The k-ε turbulence modelwas used to obtain the analytical results and the major parameters were the geometrical dimensionof helical guide vanes, the inner diameter and length of cylindrical part. Particle trajectorycalculations were performed for the particle sizes of 5~75㎛ corresponding to KS A 0090. Finallywe found out and recommended one dust collector that showed appreciable performanceimprovement. The experiment for confirming the numerical results was conducted by KS R 1041.From the numerical analysis and the experimental test, it was seen that the specified collectorrecommended in this study had dust collecting rate of about 99.91% and the pressure drop of23.9mbar, and was more effective than old one that had been conventionally used in real work field
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1321.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Physical Property Evaluation for High Purity Niobium and Tantalum Rare Metals (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1059-1062 
    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: Thermal, electrical and mechanical properties of high purity niobium and tantalumrefractory rare metals were investigated to evaluate the physical purity. Higher purity niobium andtantalum metals showed lower hardness due to smaller solution hardening effect. Temperaturedependence of electrical resistivity showed a typical metallic behavior. Remarkable decrease inelectrical resistivity was observed for a high purity specimen at low temperature. However, thermalconductivity increased for a high purity specimen, and abrupt increase in thermal conductivity wasobserved at very low temperature, indicating typical temperature dependence of thermalconductivity for high purity metals. It can be known that reduction of electron-phonon scatteringleads to increase in thermal conductivity of high purity niobium and tantalum metals at lowtemperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1059.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Optical and Surface Morphological Study of GaN Nanocolumn Grown on Gallium Coated Si by Molecular Beam Epitaxy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 31 (Nov. 2007), p. 120-122 
    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: Vertically aligned GaN nanocolumn arrays were grown by molecular beam epitaxy onGallium coated silicon substrate. The dense packing of the NCs gives them the appearance of acontinuous film in surface view, but cross-sectional analysis shows them to be isolatednanostructures. The GaN nanocolumns have uniform diameters of 85 nm, lengths up to 720 nm andpossess a pyramid like tip. Photoluminescence measurements of NCs show excitonic emission witha dominant, narrow peak centered at 363 nm and FWHM of 68 meV. From the Raman spectrum,peaks at 566.9 and 730 cm-1 are assigned to the E2 and A1(LO) GaN phonons modes which clearlyindicates that the grown nanocolumns are highly crystalline. The grown nanocolumns are highlyoriented and perpendicular to the growth 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.31.120.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Growth and Evaluation of GaN Grown on Patterned Sapphire Substrates (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 351-354 
    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: We report the microstructure and optical properties of gallium nitride (GaN) epilayersgrown on lens shape patterned sapphire substrate (PSS) using metalorganic chemical vapordeposition (MOCVD) for various growth times. A lens shaped pattern was used to reduce thethreading dislocation density and to improve optical emission efficiency. A scanning electronmicroscope (SEM) image shows flat and smooth surface of GaN grown on PSS at 80 min which couldbe achieved by lateral growth from the trench region. From the DCXRD spectra, full width at halfmaximun (FWHM) value was decreased with increasing growth time. FWHM of the sample grown at80 min was 473.5 arc sec. This indicates there is an improvement in crystalline quality of the GaNgrown on PSS as the growth time increases. From photoluminescence (PL) spectra, an increase inband edge emission intensity and a decrease in defect related yellow luminescence was observed forGaN on PSS as the growth time increased. From the PL spectra, FWHM was 82.2 meV at peakposition 363.9 nm for the sample grown for 80 min. It is clearly seen that the threading dislocationscan be reduced by lateral growth improving the light emission efficiency by internal light reflection onthe lens surface for GaN grown on PSS
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.351.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Titanium-Reinforced Polytetrafluoroethylene Membrane Combined with Inorganic Polyphosphate Induces Exophytic Bone Formation in Rabbit Calvaria (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1075-1078 
    Details
    ISSN: 1013-9826
    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 purpose of this study was to examine if the application of titanium-reinforced expandedpolytetrafluoroethylene(TR-ePTFE) membrane combined with bovine bone mineral(BBM) soakedin inorganic polyphosphate promotes exophytic bone formation in rabbit calvaria. For this purpose,a total of 8 rabbits were used, and rectangular decorticated calvaria sites were created using a roundcarbide bur. In the control group, rectangular parallelepiped-shaped TR-ePTFE membranes(RPTPMs) were filled with BBM soaked in saline and placed on the decorticated sites and fixedwith metal pins. In the experimental groups, RPTPMs were filled with BBM soaked in 4%, 8% and16% inorganic polyphosphate prior to fixing with metal pins. Animals were sacrificed at 4 and 8weeks after surgery, and new bone formation was assessed by histomorphometric as well asstatistical analysis. The results indicated that at 8 weeks, all the experimental groups demonstratedexophytic bone formation. At 8 weeks, the 8% polyphosphate group revealed the most new boneformation (p〈0.05). On the basis of these findings, we conclude that inorganic polyphosphate has apromoting effect on bone regeneration, possibly by enhancing osteoinductivity of the decorticatedwound area and osteoconductivity of the carrier material, but not much as we expected
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1075.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of Microstructure on SiC〈sub〉p〈/sub〉/AZ91 Magnesium Composite Fabricated by Rotation-Cylinder Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 510-511 (Mar. 2006), p. 182-185 
    Details
    ISSN: 1662-9752
    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: Eco-friendly development and on-going research strategy of Rotation-Cylinder Method (RCM) is given for SiCp/AZ91 Mg composites, identifying some of the key factors that need to be controlled and indicating subsequent casting processes. RCM produces U-shaped laminar melt surface with a Rankine vortex even at high rotation speed in an ambient atmosphere, which allows quick and efficient incorporation and homogeneous distribution of SiC particulates into molten Mgalloys. Therefore, sound SiCp/AZ91 Mg composites can be manufactured in conjunction with subsequent casting processes, such as investment casting and thixocasting. A transmission electron microscopy study showed that the interfacial reaction products consist of Mg2Si, MgO, Mg17Al12 and Al6Mn, which were analyzed using primitive cell volume and zero order Laue zone pattern andsingle convergent beam electron diffraction pattern containing higher order Laue zone ring from a nanosized region
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.510-511.182.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Making Alumina Microcomponents From Al Powder (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 1041-1044 
    Details
    ISSN: 1662-9752
    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 microcomponents have distinguishing advantages over Si counterparts.However, the shrinkage of alumina, as high as 20%, makes it difficult to produce precisioncomponents that require a high tolerance. A new fabrication process is presented to greatly reducethe shrinkage. The process consists of forming an Al powdered component through sintering andtransforming the Al powdered component into an alumina part. In this way, the shrinkage occurringin sintering the Al powder component will be compensated by the expansion occurred when Altransforms into alumina. The process involves producing micro-moulds, preparing metallic paste,filling the micro-moulds with the metallic paste, demoulding, sintering the green Al patterns andfinally oxidising the sintered Al-based components to achieve alumina components. The processwas proven successful. Characterization of the sintered alumina microcomponents has beenundertaken, including SEM image analysis, density and scale measurements
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1041.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    High Temperature Deformation Behavior of Beta-Gamma TiAl Alloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1531-1536 
    Details
    ISSN: 1662-9752
    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 study, high-temperature deformation behavior of newly developed beta-gamma TiAl alloyswas investigated in the context of the dynamic-materials model (DMM). Processing mapsrepresenting the efficiency of power consumption for microstructure evolution were constructedutilizing the results of compression test at temperatures ranging from 1000oC to 1200oC and strainrates ranging from 10-4/s to 102/s and Artificial Neural Network simulation method. With the helpof processing map and microstructural analysis, the optimum processing condition for the betagammaTiAl alloy was investigated. The role of β phase was also discussed in this study
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1531.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Sintering Behaviour of Al-Cu-Mg-Si Blends (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 597-600 
    Details
    ISSN: 1662-9752
    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 increasing demand for automotive industries to reduce the weight of the vehicles hasled to a growing usage of Al alloy powder metallurgy (P/M) parts such as camshaft bearing caps,shock absorber pistons and brake calipers [1,2]. In order to control the sintered microstructure andmechanical properties of the aluminium alloy powder metallurgical (P/M) parts, it is essential toestablish a fundamental understanding of the microstructural development during the sinteringprocess. Current research at Birmingham University is focussed on the investigation of the sinteringbehaviour of Al-Cu-Mg-Si powder blends using a combination of Scanning Electron Microscopy,Energy Dispersive Microanaylsis (SEM) and Differential Scanning Calorimetry (DSC). This paperpresents a detailed study of the effect of temperature and initial starting materials on the evolutionof microstructure during the sintering of Al-Cu-Mg-Si blends for PM
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.597.pdf
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