Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Stress Relaxation of Polycrystalline Ceramics with Grain-Boundary Sliding and Grain Interlocking (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The stress relaxation of two-phase polycrystalline ceramics has been examined. A two-dimensional array of elastic hexagonal grains embedded in a contiguous fluid has been used as a model for grain-boundary sliding and grain interlocking. The viscoelastic constitutive equation, in a phenomenological sense, is of a nonlinear Maxwell type; the model is composed of a strain-dependent dashpot and an elastic spring connected in series. The squeezing-in/out processes and mechanisms of grain-boundary fluid essentially result in the rheological nonlinearity. The experimental results in stress-relaxation tests of a β-spodumene glass-ceramic under simple shear are characterized from the standpoint of the nonlinear constitutive equation. It is emphasized that the stress-relaxation test is one of the important test techniques that enables one to study quantitatively the rheological behavior of polycrystalline ceramics with grain-boundary sliding and grain interlocking without any of the difficulties and ambiguities that are accompanied by stress-induced grain-boundary cavities, which so often appear in conventional creep tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01737.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Grain-Boundary Sliding and Grain Interlocking in the Creep Deformation of Two-Phase Ceramics (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Grain-boundary sliding and grain interlocking of two-phase ceramics during creep are examined on the basis of the Dryden–Kucerovsky–Wilkinson–Watt theory. That theory is extended to the plane–strain creep deformation of model arrays of square and hexagonal grains embedded in a continuous grain-boundary melt phase to develop consti-tutive equations for their universal creep. Superposition is derived for the “time-applied stress” and the “time–temperature” relations during creep. The “shift factor” for the time–temperature superposition characterizes the temperature dependence of the apparent viscosity of the ceramic. A two-phase ceramic during creep acts as a non-Newtonian fluid, the viscosity of which is dependent on the creep strain. The constitutive relation between the creep strain rate and the creep strain is then utilized to estimate the viscosity and the volume fraction of the intergranular melt phase. The equilibrium creep strain to achieve grain interlocking is considered through the rotational motion of grains. Creep tests for a β-spodumene glass-ceramic are conducted under simple shear to generate experimental results for scrutinizing the theoretical predictions. Satisfactory agreement is observed, giving important rheological information on the creep process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02523.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The Role of Grain Morphology in Superplastic Deformation (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 247 (Aug. 2003), p. 283-286 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.247.283.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Grain-Size-Dependent Cooperative Grain-Boundary Sliding in Superplastic Deformation (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 447-448 (Feb. 2004), p. 97-104 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.447-448.97.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Elastoplastic Line Contact in Cylindrical Indentation (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 857-860 
    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: A novel indentation method is proposed to study the mechanical properties of porousand/or heterogeneous materials by the use of a cylindrical indenter with line loading on test specimens. The problems in line contact are examined. The indentation load P versus penetration depth h relation in line contact is expressed in terms of the radius R of cylindrical indenter and the contact length L. An application of a cylindrical indentation to a polycrystalline graphite leads to a successful determination of the Young's modulus and the yielding strength. It is concluded that the line contact rather than the conventional pyramidal point contact is more efficient for the experimental deternination of mechanical properties of porous and/or heterogeneous materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.857.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Sintering Behavior of Microstructured γ-Alumina with Nanosized γ-Alumina Additive (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 7-10 
    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 order to fabricate an alumina ceramics with high density at low sintering temperature,nanosized γ–Al2O3 powders with average size of 9.7 nm were added to microsized γ–Al2O3powders with 2 #m and they were well mixed. Its sintering behavior was studied in the temperaturerange of 1000oC to 1300oC and in holding time from 1 hour to 10 hours. Compacted samples with adifferent mixed ratio of nanosized and microsized Al2O3 powders (N/M ratio) were prepared andpressured at 1 GPa in a uniaxial direction. The phase transformation from γ–Al2O3 to α–Al2O3 takesplace at 1100oC for 1hour sintering in all compacted samples. This rate is increased with increasingN/M ratio. The relative density varied from 70% to 95% depending on temperature and N/M ratio.With increasing sintering temperature from 1000oC to 1300oC, it was changed from 70% to 93%.Especially, the relative density was enhanced about 9% higher than that of only microsized sampleby only 10 wt% addition of nanosized powders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.7.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Indentation Contact Deformation of 3Y-TZP at Elevated Temperatures (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 469-472 
    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 contact deformation mechanisms of a superplastic ceramic, 3Y-TZP (3mol %yttria-partially stabilized tetragonal zirconia polycrystals) are examined in indentation creep tests athigh temperatures. A large discrepancy between the uniaxial compression and the pyramidalindentation contact behaviors is observed. The indentation creep curves exhibit a hardening behavior,i.e., the penetration rate decreases as the penetration depth and/or the creep time increases. This factimplied that the cooperative grain-boundary sliding (CGBS) in a microscopically localized region,such as the sub-surface contact region beneath a pyramidal indenter, is very limited through themicroscopic processes of localized grain interlocking
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.469.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Mechanical Properties of Sol-Gel Inorganic-Organic Hybrid Films in Nanoindentation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 317-322 
    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: Methylsilsesquioxane films were formed on glass substrates by dropping a sol preparedfrom methyltriethoxysilane and then heat-treated in an oven. Nanoindentation test was performed toassess the elastoplastic properties of the films, including the relative residual depth ξr, Meyer hardnessHM, work-of-indentation WI and the elastic modulus E’. The values of ξr, HM and WI were obtained bya Berkovich indenter and E’ was determined by a spherical indenter on the basis of Hertz elastictheory. ξr decreased with the increase in the heat treatment time, whereas HM , WI and E’ significantlyincreased with the time. The changes in the mechanical properties with the heat treatment time wellreflected the evolution of the Si-O-Si network structure in methylsilsequioxane film
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.317.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of Monodispersed Inorganic-Organic Hybrid Particles from Phenyltriethoxysilane (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 677-682 
    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: Preparation of monodispersed inorganic-organic hybrid particles has become one of themost attractive research topics in recent years. In this study, phenylsilsesquioxane (PhSiO3/2) particleswere synthesized from phenyltriethoxysilane (PhSi(OEt)3), ethanol (EtOH), hydrochloric acid forhydrolysis and ammonia water for polycondensation by the sol-gel method. Spherical PhSiO3/2particles were obtainable by varying the mole ratios of EtOH, H2O, HCl and NH3, to PhSi(OEt)3. Theparticle size was changed from 0.1 to 5.0 .m with the mole ratio. Under the optimum conditions,monodispersed particles with 1.50 .m in diameter and 0.05 of normalized standard deviation weresuccessfully prepared
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.677.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Titania Nanocrystals-Dispersed Coatings from SiO〈sub〉2〈/sub〉-TiO〈sub〉2〈/sub〉 Gel Films through Hydrolysis and Dissolution (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 565-568 
    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: Anatase nanocrystals were formed on sol-gel derived SiO2-TiO2 coatings with water vaporor hot water treatments. The anatase nanocrystals were precipitated through hydrolysis of Si-O-Tibonds, dissolution of SiO2 component, migration of hydrolyzed titania species, and nucleation andgrowth. The process temperatures can be lowered below 60oC, which should open new applications.It was found that the crystal habit of titania was changes from roundish anatase to sheet-like titania byapplying vibration during the hot water treatment. The nanosheets were identified as hydrated titania,TiO2 . mH2O, with layerd structure. The coatings of hydrated titania showed high photocatalyticactivities and excellent antifogging properties due to their unique morphology
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.565.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...