Application of generalized non-Schmid yield law to low-temperature plasticity in bcc transition metals

In this work, a generalized yield criterion that captures non-Schmid effects is proposed and implemented into a finite element crystal plasticity model to simulate plastic deformation of single and polycrystals.The parameters required for the constitutive formulation were calibrated to deformation experiments on single crystals.This model is used to investigate the effects of non-Schmid effects on the predictions of the stress-strain response and texture evolution in body-centered-cubic (bcc) metals.The non-Schmid contributions are required to accurately predict the stress-strain response of single crystals, and the concomitant non-associativity of the flow also increases the tendency of localization in polycrystal deformations.