On bifurcation of homogenous deformation in metallic glasses

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	On bifurcation of homogenous deformation in metallic glasses
	Chen Y(陈艳); Dai LH(戴兰宏)
	2013
会议日期	June 16, 2013 - June 21, 2013
会议地点	Beijing, China
关键词	Bifurcation (mathematics) Continuum mechanics Elasticity Fracture Glass Glass transition Metallic glass Nanotechnology Shear bands Bifurcation condition Bifurcation theory Deformation localization Homogeneous deformation Inelastic deformation Loss of ellipticity Pressure sensitivities Structural evolution
页码	5768-5776
英文摘要	At temperatures well below the glass transition and at high stresses, the homogenous deformation in metallic glasses (MGs) usually develops to a critical point, at which the discontinuity in deformation rate is incipient across nano-scale shear bands. However, such a bifurcation condition of homogeneous deformation concerning the unique properties of MGs is still lacking for general stress state. In this paper, a new constitutive is introduced for MGs accounting for the pressure-sensitivity, dilatancy and structural evolution; the shear banding is regarded as the appearance of instability in the constitutive description of inelastic deformation. Tying the bifurcation theory to the new model, the general condition of deformation localization is derived. The shear band initiation and failure orientation are then precisely predicted for MGs by constructing a bridge between the microscopic origin and the loss-of-ellipticity instability in the constitutive law in continuum mechanics. Copyright © (2013) by International Conference on Fracture.
会议录	13th International Conference on Fracture 2013, ICF 2013
语种	英语
ISBN号	9781629933696
内容类型	会议论文
源URL	[http://dspace.imech.ac.cn/handle/311007/77985]
专题	力学研究所_非线性力学国家重点实验室
作者单位	State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing, 100190, China
推荐引用方式 GB/T 7714	Chen Y,Dai LH. On bifurcation of homogenous deformation in metallic glasses[C]. 见:. Beijing, China. June 16, 2013 - June 21, 2013.