Collective evolution dynamics of multiple shear bands in bulk metallic glasses

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	Collective evolution dynamics of multiple shear bands in bulk metallic glasses
	Chen Y(陈艳); Jiang MQ(蒋敏强); Dai LH(戴兰宏)
刊名	INTERNATIONAL JOURNAL OF PLASTICITY
	2013-11
通讯作者邮箱	lhdai@lnm.imech.ac.cn
卷号	50 页码:18-36
关键词	Bulk metallic glasses Multiple shear bands Size effect Momentum diffusion Energy dissipation
ISSN号	0749-6419
通讯作者	Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
产权排序	[Chen, Y.; Jiang, M. Q.; Dai, L. H.] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
中文摘要	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.
学科主题	新型材料的力学问题
分类号	一类
收录类别	SCI ; EI
资助信息	NSFC [11202221, 11132011, 11002144, 11021262]; National Natural Science Foundation of China-NSAF [10976100]; National Key Basic Research Program of China [2012CB937500, 2009CB724401]
原文出处	http://dx.doi.org/10.1016/j.ijplas.2013.03.010
语种	英语
WOS记录号	WOS:000323872600002
公开日期	2013-09-27
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47449]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Chen Y,Jiang MQ,Dai LH. Collective evolution dynamics of multiple shear bands in bulk metallic glasses[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2013,50:18-36.
APA	陈艳,蒋敏强,&戴兰宏.(2013).Collective evolution dynamics of multiple shear bands in bulk metallic glasses.INTERNATIONAL JOURNAL OF PLASTICITY,50,18-36.
MLA	陈艳,et al."Collective evolution dynamics of multiple shear bands in bulk metallic glasses".INTERNATIONAL JOURNAL OF PLASTICITY 50(2013):18-36.