Implementation of ABAQUS User Subroutines for Viscoplasticity of 316 Stainless Steel and Zircaloy-4

This paper describes the formulations for the viscoplasticity of metals based on the Chaboche and Delobelle model. The implementations of the viscoplastic models were detailed herein and then implemented via user subroutines for material models (UMAT) in ABAQUS. Two typical metals, i.e., 316 Stainless Steel and Zircaloy-4, were chosen as examples and their viscoplastic behaviors were captured. Numerical simulations are compared to reported experiments in order to validate the models and the UMAT codes. The typical viscoplastic behaviors of both metals, such as stress relaxation and creep, were captured well through the available experiments. We have publicized all the data and codes.

Automated summary

This paper presents the formulations for the viscoplasticity of metals based on the Chaboche and Delobelle model, and implements them using UMAT in ABAQUS. The viscoplastic behaviors of two typical metals, 316 Stainless Steel and Zircaloy-4, are captured and validated through numerical simulations and comparison with experimental data. The data and codes are made publicly available.