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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 PublicationCOMPUTATIONAL MATERIALS SCIENCE
2015-02-15
Volume98Pages:70-75
ISSN0927-0256
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.

KeywordStrain Rate Effect Molecular Dynamics Thermal Activation Model Potential Landscapes
Subject AreaMaterials Science
DOI10.1016/j.commatsci.2014.10.065
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000346733000011
Funding OrganizationSupport 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.
DepartmentLNM材料的分子/细观统计力学行为
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49600
Collection非线性力学国家重点实验室
Corresponding AuthorXiao, 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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