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Title: Collective evolution dynamics of multiple shear bands in bulk metallic glasses
Author: Chen Y(陈艳); Jiang MQ(蒋敏强); Dai LH(戴兰宏)
Source: INTERNATIONAL JOURNAL OF PLASTICITY
Issued Date: 2013-11
Volume: 50, Pages:18-36
Abstract: The collective behavior of multiple shear bands was investigated under in situ four-point bending tests of a Zr-based bulk metallic glass (BMG) over a wide range of sample scales. The self-organization of shear band pattern, characterized by shear band spacing and shear offset, is observed with the variation of sample size and bend curvature, which presents significant size effect and tension-compression asymmetry. To unveil these fundamental behaviors, an analytical model for the evolution dynamics of multiple shear banding is developed for BMGs. In this model, both micro-structural evolution and pressure sensitivity are taken into account by introducing a new law for the stress softening of BMGs within the framework of continuum mechanics; the collective evolution of shear bands is regarded as the coupling result of the structural softening, the momentum diffusion, and the energy conservation. Applying the proposed theoretical model to the bending deformation of BMGs, the analytical solutions of shear band spacing, shear offset and failure strain are obtained. The fundamental behaviors of multiple shear bands are uncovered, in line with the experimental observations: notable scaling laws are found in the evolution of shear band spacing and shear offset, and the inhomogeneous size effect of plasticity is revealed by a transition from weak to strong size-dependence of failure strain with decreasing sample thickness. To be further, a competing map of shear band nucleation and propagation is established based on energy dissipation. The underlying mechanism of these size dependent behaviors of multiple shear bands in BMGs is found to be ascribed to the energy dissipation competition between the nucleation and propagation of shear bands.
Keyword: Bulk metallic glasses ; Multiple shear bands ; Size effect ; Momentum diffusion ; Energy dissipation
Language: 英语
Indexed Type: SCI ; EI
Corresponding Author: Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
Correspondent Email: lhdai@lnm.imech.ac.cn
Related URLs: 查看原文
WOS ID: WOS:000323872600002
ISSN: 0749-6419
Rank: [Chen, Y.; Jiang, M. Q.; Dai, L. H.] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
Subject: 固体力学::新型材料的力学问题
Department: LNM冲击动力学与新型材料力学性能
Classification: 一类
Citation statistics:
Content Type: 期刊论文
URI: http://dspace.imech.ac.cn/handle/311007/47449
Appears in Collections:非线性力学国家重点实验室_期刊论文

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Recommended Citation:
陈艳;蒋敏强;戴兰宏.Collective evolution dynamics of multiple shear bands in bulk metallic glasses,INTERNATIONAL JOURNAL OF PLASTICITY,2013,50():18-36
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