IDENTIFICATION OF DYNAMIC BEHAVIOUR LAW PARAMETERS FOR METALLIC MATERIALS USING TAYLOR IMPACT TEST

摘要

This paper presents an identification procedure of dynamic behaviour law parameters based on Taylor impact test. Experiments are done using a compressed gas gun facility allowing to obtain high strain rates for metallic materials under impact. The evaluation of the experimental results is based on the measure of the final deformed shape by a macro-photographic device. An identification program based on a combined Monte-Carlo and Levenberg-Marquardt algorithms performs a minimisation between experimental final geometry and the numerical one provided by the corresponding FE model. This algorithms combination, implemented using the C++ language in the home made identification program called Identif, gives the numerical values for the constitutive parameters of the identified laws. An application for an aluminium alloy shows the efficiency and robustness of the proposed procedure.