期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 53, 期 6, 页码 1280-1294出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2005.02.001
关键词
dislocations; crystal plasticity; non-local plasticity
Gurtin recently proposed a strain-gradient theory for crystal plasticity in which the gradient effect originates from a defect energy that characterizes energy storage due to the presence of a net Burgers vector. Here we consider a number of different possibilities for this energy: specifically, working within a simple two-dimensional framework, we compare predictions of the theory with results of discrete-dislocation simulations of stress relaxation in thin films. Our objective is to investigate which specific defect energies are capable of capturing the size-dependent response of such systems for different crystal orientations. (c) 2005 Elsevier Ltd. All rights reserved.
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