期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 112, 期 -, 页码 508-522出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2018.01.007
关键词
Strain gradient; Crystal plasticity; Size effect; Surface effects; Surface yielding
资金
- China Scholarship Council (CSC)
- National Natural Science Foundation of China (NSFC) [11772220]
A finite-deformation gradient crystal plasticity theory is developed, which takes into account the interaction between dislocations and surfaces. The model captures both energetic and dissipative effects for surfaces penetrable by dislocations. By taking advantage of the principle of virtual power, the surface microscopic boundary equations are obtained naturally. Surface equations govern surface yielding and hardening. A thin film under shear deformation serves as a benchmark problem for validation of the proposed model. It is found that both energetic and dissipative surface effects significantly affect the plastic behavior. (C) 2018 The Authors. Published by Elsevier Ltd.
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