Numerical Simulation of Sheet Metal Blanking Process using a Coupled Finite Elastoplastic Damage Modelling

摘要

This paper presents a numerical methodology which aims to improve virtually any sheet metal blanking processes. This methodology is based on elastoplastic constitutive equations accounting for non-linear mixed isotropic and kinematic hardening "strongly" coupled with isotropic ductile damage. This set of fully coupled constitutive equations have been implemented into a Dynamic Explicit (DE) finite element code (Abaqus/Explicit) using user subroutine Vumat. The local integration of the plastic-damage constitutive equations is performed using an asymptotic implicit scheme applied to only two scalar equations solved by Newton-Raphson algorithm. This procedure has been shown to be able to simulate any cutting operation due to the propagation of the fully damaged zones. It gives a very helpful numerical procedure to improve "virtually" any blanking operation in order to avoid the commonly used trial and error expensive method. Applications are made to study the effect of some technological parameters on sheet metal blanking processes.