Plastic and viscoplastic damage models with numerical treatment for metal forming processes

Abstract

Abstract Metal forming processes are problems with a multiplicity of non linearities. There are physical non linearities (plasticity, viscoplasticity, damage), geometrical non linearities (large displacements, large deformations), contact and friction non linearities. Therefore, numerical simulations of metal forming processes lead to choosing appropriate constitutive equations and a suitable algorithm to solve these problems. The work presented here treats these difficulties. Firstly, we proposed a stable elasto-plastic damage model and a stable elasto-viscoplastic (visco) damage model for large transformations. Secondly, we use the large time increment method in a version adapted to solve non linear geometrical problems with contact and friction.