Transition of mechanisms underlying the rate effects and its significance | |
Xiao P(肖攀); Wang J(王军); Yang R(杨荣); Ke FJ(柯孚久); Bai YL(白以龙); Xiao, P (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. | |
Source Publication | COMPUTATIONAL MATERIALS SCIENCE |
2015-02-15 | |
Volume | 98Pages:70-75 |
ISSN | 0927-0256 |
Abstract | The strain rate dependency of materials' failure has been widely observed in experiments and simulations, yet its microscopic mechanism is still elusive due to the complexity of failure processes. In this work, modified molecular dynamics simulations are carried out to investigate the strain rate effect over a wide strain rate range. The results demonstrate three typical failure modes induced by the competition of two timescales involved. The transition of mechanisms underlying these failure modes is discussed with a simplified model. The corresponding analysis indicates that the thermal activation model offers a good prediction for the variation of failure strain with respect to applied strain rate for failure mode I; the coupled evolution of atomic motions and potential landscapes governs the failure mode II; and the failure mode III is a result of the rapid separation between loading and deformation parts of the sample. (C) 2014 Elsevier B.V. All rights reserved. |
Keyword | Strain Rate Effect Molecular Dynamics Thermal Activation Model Potential Landscapes |
Subject Area | Materials Science |
DOI | 10.1016/j.commatsci.2014.10.065 |
URL | 查看原文 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000346733000011 |
Funding Organization | Support from the National Basic Research Program of China (Grant No. 2012CB937500), the National Natural Science Foundation of China (Grant Nos. 11202212, 11172305, 11172024, 11232013 and 11372022), is gratefully acknowledged. Computations were performed on the ScGrid of Supercomputing Center, Computer Network Information Center of Chinese Academy of Sciences and LNMGrid of the State Key Laboratory of Nonlinear Mechanics. |
Department | LNM材料的分子/细观统计力学行为 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/49599 |
Collection | 非线性力学国家重点实验室 |
Corresponding Author | Xiao, P (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
Recommended Citation GB/T 7714 | Xiao P,Wang J,Yang R,et al. Transition of mechanisms underlying the rate effects and its significance[J]. COMPUTATIONAL MATERIALS SCIENCE,2015,98:70-75. |
APA | Xiao P,Wang J,Yang R,Ke FJ,Bai YL,&Xiao, P .(2015).Transition of mechanisms underlying the rate effects and its significance.COMPUTATIONAL MATERIALS SCIENCE,98,70-75. |
MLA | Xiao P,et al."Transition of mechanisms underlying the rate effects and its significance".COMPUTATIONAL MATERIALS SCIENCE 98(2015):70-75. |
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