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 order to describe scale effects in rigid-viscosity-plastic deformation at micro scale, astrain rate gradient model with couple stress is proposed. In the constitutive equation, couple stress,strain rate gradient are introduced on the assumption that the potential energy depends upon the scalarinvariants of the strain rate tensor and strain rate gradient tensor, at the same times, the influences oflength scale of body, grain size and temperature are also considered. A FEM-based program based onthis strain rate gradient model is used to simulate the process of high temperature gas pressureforming, and the value of length scale 2 l is evaluated by simulation pilot calculation. It is indicatedthat rigid-viscosity-plastic deformation can be more accurately simulated by the present straingradient rate model as long as the material parameters in constitutive equation are selected suitably
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.323.pdf
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