|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XV
||Deformation in Amorphous Notched Bars; A Discrete Shear Transformation Zone Plasticity Analysis
||Babak Kondori, Amine Benzerga, Alan Needleman
|On-Site Speaker (Planned)
A discrete Shear Transformation Zone (STZ) plasticity framework is used to study plane strain tension of amorphous un-notched and notched bars. Deformation is accommodated by the formation of STZs, modeled as Eshelby inclusions. Superposition is used to represent a boundary value problem (BVP) solution in terms of discretely modeled Eshelby inclusions and an image solution that enforces the prescribed boundary conditions. The image problem is a standard linear elastic BVP, solved by the finite element method. Potential STZ activation sites are randomly distributed in the bars and constitutive relations are specified for their evolution. The computed stress-strain curves are serrated with the magnitude of the associated stress-drops depending on bar size, notch acuity and details of STZ kinetics. Depending on the STZ kinetics, both notch strengthening and notch weakening are obtained. The analyses provide a rationale for some conflicting findings regarding notch effects on the mechanical response of metallic glasses.
||Planned: Supplemental Proceedings volume