Identification of optimized constitutive model parameters at a high strain rate using electromagnetic ring expansion test results

Abstract

In this article, parameters of the material constitutive model have been identified at high strain rate electromagnetic ring expansion test using experimental data taken from literature for oxygen-free electronic copper (OFE Cu). The experimental data were processed using a finite-element optimization procedure in which the measured deformation has been applied to a specimen. An optimal set of material constants for JohnsonCook constitutive model have been computed by minimizing the standard deviation of differences between experimental and calculated stressstrain curves. The applicability of identified parameters has been validated successfully by using simulation of reverse Taylor impact test results. The presented method in this article was found to be an effective method for identifying the material model parameters at high strain rates.