A Microstructure Sensitive Model for Simulating the Impact Response of a High Manganese Austenitic Steel

Abstract

Microstructurally informed macroscopic impact response of a highmanganese austenitic steel was modeled through incorporation of the viscoplastic selfconsistent (VPSC) crystal plasticity model into the ansys lsdyna nonlinear explicit finiteelement (FE) frame. Voce hardening flow rule, capable of modeling plastic anisotropy in microstructures, was utilized in the VPSC crystal plasticity model to predict the micromechanical response of the material, which was calibrated based on experimentally measured quasistatic uniaxial tensile deformation response and initially measured textures. Specifically, hiring calibrated Voce parameters in VPSC, a modified material response was predicted employing local velocity gradient tensors obtained from the initial FE analyses as a new boundary condition for loading state. The updated micromechanical response of the material was then integrated into the macroscale material model by calibrating the Johnson–Cook (JC) constitutive relationship and the corresponding damage parameters. Consequently, we demonstrate the role of geometrically necessary multiaxial stress state for proper modeling of the impact response of polycrystalline metals and validate the presented approach by experimentally and numerically analyzing the deformation response of the Hadfield steel (HS) under impact loading.