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Origin of stress overshoot in amorphous solids
Jiang MQ(蒋敏强); Wilde G; Dai LH(戴兰宏); Jiang, MQ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
AbstractBased on the shear-transformation-zone (STZ) theory, we propose a constitutive model for describing homogeneous elastoplastic deformation of amorphous solids where the interaction of shear transformations and free volume dynamics is incorporated. This theoretical model can reproduce the stress overshoot behavior that shows the dependence of strain rate, temperature, STZ population and dilatancy of systems. It reveals that the stress overshoots its steady state value due to the delayed activation of shear transformations that results from the insufficient free volume in the system. However, the subsequent strain softening (stress drop) is attributed to the shear-induced dilatation that is a result of the positive interplay between shear transformations and free volume creation, the latter playing the dominant role. Our analysis also demonstrates that the STZs, as basic carriers of amorphous plasticity, govern the yielding of the system, whereas the free volume dynamics significantly affects the post-yielding behaviors. (C) 2014 Elsevier Ltd. All rights reserved.
KeywordAmorphous Solid Plastic Flow Stress Overshoot Shear Transformation Zone Free Volume
Subject AreaMaterials Science ; Mechanics
Indexed BySCI ; EI
WOS IDWOS:000348255300007
Funding OrganizationThis work was supported by the National Nature Science Foundation of China (Grant Nos 11372315, 11132011 and 11023001) and the National Key Research Program of China (Grant No 2012CB937500). MQJ acknowledges the Alexander von Humboldt Foundation for support with a research fellowship. GW acknowledges the support by DFG. LHD acknowledges the CAS/SAFEA International Partnership Program for Creative Research Teams.
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Cited Times:48[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorJiang, MQ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Jiang MQ,Wilde G,Dai LH,et al. Origin of stress overshoot in amorphous solids[J]. MECHANICS OF MATERIALS,2015,81:72-83.
APA 蒋敏强,Wilde G,戴兰宏,&Jiang, MQ .(2015).Origin of stress overshoot in amorphous solids.MECHANICS OF MATERIALS,81,72-83.
MLA 蒋敏强,et al."Origin of stress overshoot in amorphous solids".MECHANICS OF MATERIALS 81(2015):72-83.
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