期刊
INTERNATIONAL JOURNAL OF PLASTICITY
卷 144, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijplas.2021.103030
关键词
Dislocations in crystals; Drag coefficient; Elastic precursor decay
资金
- U.S. Department of Energy [89233218CNA000001]
- Physics and Engineering Models sub-program element of the Advanced Simulation and Computing program
The translation mainly discusses the influence of dislocations on plastic deformation and the importance of accurately modeling dislocation drag and dislocation density evolution under high stress conditions. On one hand, dislocation drag is modeled based on first principles derivation, with its dependence on stress and dislocation character; on the other hand, much less is known about dislocation density evolution, leading to greater uncertainty in model parameters.
Plastic deformation is mediated by the creation and movement of dislocations, and at high stress the latter is dominated by dislocation drag from phonon wind. By simulating a 1-D shock impact problem we analyze the importance of accurately modeling dislocation drag and dislocation density evolution in the high stress regime. Dislocation drag is modeled according to a first principles derivation as a function of stress and dislocation character, and its temperature and density dependence are approximated to the extent currently known. Much less is known about dislocation density evolution, leading to far greater uncertainty in these model parameters. In studying anisotropic fcc metals with character dependent dislocations, the present work generalizes similar earlier studies by other authors.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据