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On bifurcation of homogenous deformation in metallic glasses
Chen Y(陈艳); Dai LH(戴兰宏)
2013
会议名称13th International Conference on Fracture 2013, ICF 2013
会议日期June 16, 2013 - June 21, 2013
会议地点Beijing, China
会议录名称13th International Conference on Fracture 2013, ICF 2013
页码5768-5776
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.
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
ISBN号9781629933696
收录类别EI
语种英语
文献类型会议论文
条目标识符http://dspace.imech.ac.cn/handle/311007/77985
专题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],2013:5768-5776.
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