|On bifurcation of homogenous deformation in metallic glasses|
|Chen Y(陈艳); Dai LH(戴兰宏)
|Source Publication||13th International Conference on Fracture 2013, ICF 2013
|Conference Name||13th International Conference on Fracture 2013, ICF 2013
|Conference Date||June 16, 2013 - June 21, 2013
|Conference Place||Beijing, China
|Abstract||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.|
Loss of ellipticity
|Affiliation||State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Science, Beijing, 100190, China|
Chen Y,Dai LH. On bifurcation of homogenous deformation in metallic glasses[C]13th International Conference on Fracture 2013, ICF 2013,2013:5768-5776.
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