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A multi-scale algorithm for dislocation creep at elevated temperatures

文献类型：期刊论文

作者Yuan LC(袁力超); Wei YJ(魏宇杰)
刊名THEORETICAL AND APPLIED MECHANICS LETTERS
出版日期2021-01
卷号11期号:1页码:100230
关键词Multi-scale algorithm Dislocation glide Dislocation climb High temperature creep Dislocation dynamics
ISSN号2095-0349
DOI10.1016/j.taml.2021.100230
英文摘要Dislocation creep at elevated temperatures plays an important role for plastic deformation in crystalline metals. When using traditional discrete dislocation dynamics (DDD) to capture this process, we often need to update the forces on N dislocations involving similar to N-2 interactions. In this letter, we introduce a multi-scale algorithm to speed up the calculations by dividing a sample of interest into sub-domain grids: dislocations within a characteristic area interact following the conventional way, but their interaction with dislocations in other grids are simplified by lumping all dislocations in another grid as a super one. Such a multi-scale algorithm lowers the computational load to similar to N-1.5. We employed this algorithm to model dislocation creep in Al-Mg alloy. The simulation leads to a power-law creep rate in consistent with experimental observations. The stress exponent of the power-law creep is a resultant of dislocations climb for similar to 5 and viscous dislocations glide for similar to 3. (C) 2021 Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics.
分类号二类
WOS研究方向Mechanics
语种英语
资助机构National Key Research and Development Program of China [2017YFB0202800] ; Basic Science Center for Multiscale Problems in Nonlinear Mechanics [11988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22020200] ; Chinese Academy of Sciences Center for Excellence in Complex System Mechanics ; National Natural Science Foundation of China
其他责任者Wei, YJ (corresponding author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. ; Wei, YJ (corresponding author), Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China. ; Wei, YJ (corresponding author), Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China.
源URL[http://dspace.imech.ac.cn/handle/311007/93703]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Sch Future Technol, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式
GB/T 7714		 Yuan LC,Wei YJ. A multi-scale algorithm for dislocation creep at elevated temperatures[J]. THEORETICAL AND APPLIED MECHANICS LETTERS,2021,11(1):100230.
APA 袁力超,&魏宇杰.(2021).A multi-scale algorithm for dislocation creep at elevated temperatures.THEORETICAL AND APPLIED MECHANICS LETTERS,11(1),100230.
MLA 袁力超,et al."A multi-scale algorithm for dislocation creep at elevated temperatures".THEORETICAL AND APPLIED MECHANICS LETTERS 11.1(2021):100230.

入库方式： OAI收割

来源：力学研究所

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