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  • 2005-2009  (3)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Multiaxial Electromechanical Couple Behavior of Ferroelectric Ceramic PZT53 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 463-470 
    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 multi-axial constitutive behavior of poled and unpoled ferroelectric ceramic PZT53is measured under different proportional tension-torsion loading and compression-torsion loadinguntil destroy. Deformation is measured using strain gauges. These results are used to map out“Switching” and “destroy” surfaces. The two surfaces are found to be a function of the polarization.Switching surface is similar to Mises and Tresca yield surface. Destroy behavior corresponds tomaximal principal normal stress rule. For poled PZT53, the effect of bias electric field on itsmultiaxial behavior has also been exploited.The results indicated that the “Switching” surfacedisappear with the increased bias electric. The ultimate goal is to develop an experimentallyvalidated micromechanics based phenomenological constitutive model for ferroelectric materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.463.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Finite Element Simulation of Superplastic Isothermal Forging Process for Nickel-Base PM Superalloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 551-552 (July 2007), p. 297-302 
    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 Chinese nickel-base powder metallurgy (PM) superalloy FGH96, which wasprocessed through hot isostatic pressing, is very difficult to deform. FGH96 superalloy has bettersuperplasticity in special deformation conditions and superplastic isothermal forging is the bestformation method at present. The accurate constitutive equations of the FGH96 alloy was establisheddepended on the isothermal compression experiments. A two dimensional and thermomechanicalcoupled axisymmetric finite element(FE) model in which both part and die were taken inconsideration was established to fully simulate the FGH96 superalloy turbine disk superplasticisothermal forging process. Some physical parameters about the turbine disk forging process, such asload, stress field and strain field were calculated at different temperature within the forging range ofFGH96. The regularity of peak equivalent stress acted on die cavity surface, yield limit and ultimatestrength of die material during the forging process was found. Based on the regulation, peakequivalent stress acted on cavity surface must be extremely less than yield limit of die material, theoptimized processing parameter 1050°C that is the best deformation temperature for the alloy wasdetermined. That was proved better in practice and high quality disk was forged
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.297.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An Analysis about Response of Small Structure Suffered Underwater Explosion (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 293-294 (Sept. 2005), p. 685-694 
    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: According to the characteristics of anti-explosion analysis about the small cylindricalshell structure under water, in which the wave scattering is so great that it cannot be ignored, an approximate procedure is proposed to analyze the shock load of the structure suffered underwater explosion. The shock wave is decomposed as the summation of plane harmonic waves with various frequencies, then the scattered acoustic field around the cylindrical structure is studied, by which the overall pressure distribution on the surface of the structure can be obtained. The average overall pressure of the structure suffered underwater explosion can be calculated also, which can be considered as the underwater explosive load. An underwater explosion trial is done in a lake to validate the proposed procedure, and the results show that the overall pressure distribution on the surface predicated by the procedure theoretically nicely agree with the results of trial. Then, the time history of stresses from the trial is quite close to that from numeric simulation. The procedure is understood easily, and can be applied in analyzing the time history of stresses of small cylindrical structures impacted by shock wave, in which the wave scattering of structures plays a key part
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.293-294.685.pdf
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    Paper (German National Licenses)
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