An Energy Approach Applied to Define Elasto-Plastic Constitutive Models Describing Thermomechanical Metallic Materials Behavior During Forming Processes

Abstract

A new formalism for the definition of metallic materials constitutive laws expressing the
stress as a function of the plastic deformation energy it is proposed. This new approach, called energy
approach, can integrate physical mechanisms governing the microstructure changes during a plastic
deformation. It is also important to emphasize that the proposed energy formulation is more relevant
since it can describe physical phenomena taking place in a material forming process characterizing at
the different scales the material properties evolution. This formulation remains valid for a large field of
deformation, the whole spectrum of loading conditions and remains able to predict rigorously the
material response for all types of stresses states: static, transient or dynamic.