Chapter 2: Continuum Mechanics Models and Development of VUMAT

In chapter 2 we identify the capabilities and limitations of phenomenological models on predicting such as the stress and strain curve evolution as well as the fracture tendency. To do this, we implemented one of the most popular phenomenological models – combined kinematic/isotropic model into finite element program (ABAQUS/EXPLICIT) and developed a robust user subroutine, which provides a useful tool to study formability of sheet forming process. After that we propose a modification of hardening law to predict correctly stress-strain curves with reverted load.