Bridging necking and shear-banding mediated tensile failure in glasses

The transition between necking-mediated tensile failure of glasses, at elevated temperatures and/or low strain-rates, and shear-banding-mediated failure, high is investigated using experiments on metallic glasses atomistic simulations. We experimentally simulationally show that this occurs through a sequence macroscopic patterns, parametrized by the ultimate strength. Quantitatively analyzing spatiotemporal dynamics preceding large scale simulations corroborated experimental fractography, reveals how collective evolution mutual interaction shear-driven plasticity dilation-driven void formation (cavitation) control various modes. In particular, we find global size largest cavity in loading direction exhibits nonmonotonic dependence temperature fixed strain rate, which rationalized terms interplay shear- plasticity. also scales with cross-sectional area undeformed sample. These results shed light highlight need to develop elasto-plastic constitutive models incorporating both irreversible processes.