An overstress elasto-viscoplasticity model for high/low cyclic strain rates loading conditions: Part II - Numerical analyses

The present paper aims to show the ability of the extended overstress subloading surface EOSS theory to model the rate-dependency of metallic materials subjected to different loading conditions. The numerical results were carried out by means of Finite Elements FE simulations reproducing pure creep, stress relaxation, monotonic tensile and cyclic loading conditions. A particular emphasis is given to show the model response under quasi-static and high strain rates loading conditions describing the evolution of the main variables and investigating the convergence rate of the implicit integration scheme. The validation of the EOSS model is carried out against experimental tests, found in the literature, on a lead-free solder material and a SS316L stainless steel. The numerical results are in good agreement with the experimental data proving the ability of the EOSS model to catch a realistic material description. (C) 2020 Elsevier Ltd. All rights reserved.