Rate efect and coupled evolution of atomic motions and potential landscapes  

作　　者：Pan Xiao Jun Wang Rong Yang Fu-Jiu Ke Meng-Fen Xia Yi-Long Bai 

机构地区：[1]State Key Laboratory of Nonlinear Mechanics (LNM),Institute of Mechanics, Chinese Academy of Sciences [2]School of Physics and Nuclear Energy Engineering,Beihang University

出　　处：《Acta Mechanica Sinica》2013年第5期676-681,共6页力学学报（英文版）

基　　金：supported by the National Basic Research Program of China (973 Program)(2012CB937500);the National Natural Science Foundation of China (11202212,10932011,11021262,11172024,11172305,and 11232013)

摘　　要：Since rate effect of materials plays a key role in impact engineering, the microscopic mechanism of rate effect is investigated at molecular level in this paper. The results show that rate effect on the strength of atomic system is closely related to the coupled evolution of atomic motions and potential landscapes. Accordingly, it becomes possible to develop a new algorithm of molecular simulation, which could properly and efficiently demonstrate strain rate effect under a wide range of loading rates and unveil the mecha- nisms underlying the strain rate effects.Since rate effect of materials plays a key role in impact engineering, the microscopic mechanism of rate effect is investigated at molecular level in this paper. The results show that rate effect on the strength of atomic system is closely related to the coupled evolution of atomic motions and potential landscapes. Accordingly, it becomes possible to develop a new algorithm of molecular simulation, which could properly and efficiently demonstrate strain rate effect under a wide range of loading rates and unveil the mecha- nisms underlying the strain rate effects.

关 键 词：Strain rate effect Atomic motions - Potential landscape Molecular simulation 

分 类 号：O344.1[理学—固体力学]