Prestrain-dependent viscoplastic damage model for austenitic stainless steel and implementation to ABAQUS user-defined material subroutine

Austenitic stainless steel shows complex mechanical behavior at a low-temperature range based on the transformation-induced-plasticity (TRIP) phenomenon. The prestrain effect is a plasticity process that is used for a particular purpose such as enhancing the strength, ductility, or hardness. In this paper, a viscoplastic model that considers the prestrain effect and temperature effect is proposed. In addition, a continuum damage mechanics approach is coupled with the viscoplastic model to predict material fractures under arbitrary loads. The proposed viscoplastic model is implemented in the developed ABAQUS user-defined subroutine UMAT to demonstrate its feasibility. This simulation results are compared with prestrain-dependent experimental results, which show good agreement.