Evaluation of strength model parameters from Taylor impact tests

This paper provides a method to extract sets of parameters from Taylor impact tests [1]. The method consists in a two steps algorithm which associates a Monte-Carlo method to a Levenberg-Marquardt [2, 3] optimization loop, as proposed by Nistor [4]. Iteratively, the algorithm searches the set of constants that best fits the simulations to the experiments by minimizing the error between the data. The deformation of the cylinder is modeled by an axisymetric, two-dimensional model. Validation of the solver is performed by comparisons with ANSYS Autodyn simulations. We focus our study on the Johnson-Cook model [5]. First tests on the 6061-T6 aluminum and 4340 steel have shown good agreements. Some improvements are proposed. (C) 2011 Published by Elsevier Ltd. Selection and peer-review under responsibility of ICM11