Material models for highly dynamic metal forming processes

In industry, metal forming processes are widely used in manufacturing. For optimization, simulation is becoming more and more important. Forming processes can be effciently analysed with the Finite Element Method. To obtain reliable results, a suitable material model that includes all important physical effects is essential, [1]. Especially, the ow curve model for the description of the plastic material behaviour is crucial for realistic results. In this work, we mainly focus on highly dynamic forming processes like bending or punching. First, a dynamic ow curve model for mild steel has been selected according to the literature. To use the model for forming processes with high strain rates, the temperature is considered in addition to the strain rate for modelling the adiabatic heating effect. The selected dynamic ow curve model was then implemented as a user subroutine in the Finite Element software ABAQUS. After verifying this subroutine with a unit test on one Finite Element, the material has been calibrated. For this sake, static and dynamic tensile tests as well as in-plane torsion tests have been performed. As an important material type in sheet metal production, DC01 has been chosen. The parameters of the material model have been identi ed according to [2]. Outcome of this work is a calibrated material, ready to use for simulation of industrial sheet metal forming applications.