Modelling and simulation of thin sheet blanking

Abstract

In this chapter, two models are considered to study the blanking process of thin copper sheets. Both approaches are dedicated to problems involving strain rates and temperature effects. Because of the trend in the industry of having smaller sheet thickness and higher stroke rates, the modeling of blanking requires the development of advanced material models. Large plastic strain, high-strain-rate effects, adiabatic heating and the associated temperature effects, as well as damages and ruptures are taken into account. Finite-element predictions are compared with experimental results. The mechanical threshold stress (MTS) model, combined with a nucleation and growth damage model. This model is implemented in ABAQUS/Explicit as a user material subroutine. The results obtained with this physical model are compared with a phenomenological approach. The MTS model is based on the theory of dislocation motion. It allows a physical description of the material behavior over a large range of temperature and strain rates.