Material Constitutive Parameter Identification using an Electromagnetic Ring Expansion Experiment Coupled with LS-DYNA® and LS-OPT®

In this paper, a parameter identification procedure to obtain the constitutive properties of metals at high strain rate and high temperature is presented. This procedure uses experimental results from electromagnetic ring expansions, coupled with LS-DYNA® simulations using the newly developed electromagnetism module, driven by LS-OPT®. The experiments were performed at The Ohio State University and the expansion velocities of the ring were measured. These are used as the target data for the optimization process where the constitutive properties are varied. The procedure is presented in details. It is then tested on a numerical case where the target velocity was generated by a simulation with given constitutive properties. Finally, it is used to find the constitutive properties of a copper alloy.