Elasto–Viscoplastic Constitutive Formulation with Temperature-Dependence for General loading Process Including Monotonic and Cyclic Loading Processes: Extended Subloading-Overstress Model

Abstract The exact formulation of the subloading surface model is provided in this article for the description of the elastoplastic and elasto–viscoplastic deformations not only for the monotonic but also the cyclic loading processes at general deformation rate ranging from the quasi-static to the impact loading in a unified manner by the subloading-overstress model. Here, it is noteworthy that even the elastoplastic deformation can be described more exactly by the present elasto–viscoplastic constitutive equation, noting that the elastoplastic constitutive equation is limited to the description of the quasi-static deformation behavior, but the purely quasi-static deformation does not exist actually. Therefore, the elastoplastic constitutive equation can be disused only by using the subloading-overstress model. It will be extended to describe the temperature-dependence for metals, since the elasto–viscoplastic deformation behavior is influenced by the temperature in general. Then, the validity of the extended subloading-overstress model for the prediction of the temperature-dependent elasto–viscoplastic deformation of metals will be verified by the comparisons with the test data of metals for various isothermal and/or non-isothermal deformations in the monotonic and the cyclic loading processes.