A multi-scale algorithm for dislocation creep at elevated temperatures
为脱臼的一个多尺度的算法在提高的温度爬作者机构:State Key Laboratory of Nonlinear MechanicsInstitute of MechanicsChinese Academy of SciencesBeijing 100190China School of Future TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China School of Engineering SciencesUniversity of Chinese Academy of SciencesBeijing 100049China
出 版 物:《Theoretical & Applied Mechanics Letters》 (力学快报(英文版))
年 卷 期:2021年第11卷第1期
页 面:42-46页
核心收录:
学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 080102[工学-固体力学] 0801[工学-力学(可授工学、理学学位)]
基 金:support from the National Key Research and Development Program of China (Grant 2017YFB0202800) the National Natural Science Foundation of China, Basic Science Center for “Multiscale Problems in Nonlinear Mechanics” (Grant 11988102) the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant XDB22020200) the Chinese Academy of Sciences Center for Excellence in Complex System Mechanics
主 题:Multi-scale algorithm Dislocation glide Dislocation climb High temperature creep Dislocation dynamics
摘 要:Dislocation creep at elevated temperatures plays an important role for plastic deformation in crystalline *** using traditional discrete dislocation dynamics(DDD)to capture this process,we often need to update the forces on N dislocations involving~N 2 *** 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 *** a multi-scale algorithm lowers the computational load to~N *** employed this algorithm to model dislocation creep in Al-Mg *** simulation leads to a power-law creep rate in consistent with experimental *** stress exponent of the power-law creep is a resultant of dislocations climb for~5 and viscous dislocations glide for~3.