Parameter Identification and Sensitivity Analysis
We propose to identify the constitutive equation parameters of anisotropic sheet metals and to study the effect of variations in parameters on the response of a given behaviour model. These anisotropic coefficients are identified by solving an inverse identification problem based on a set of experimental tests and on the coupling of a specific finite element method with an optimization algorithm. The parametric sensitivity analysis developed in this paper is based on a specific method, which allows the calculation of the variation of the stress field in the sample with respect to anisotropic parameters. Therefore, the sensitivity of the global response of the whole structure is then calculated. In this study, elastoplastic behaviour models associated to isotropic hardening are assumed. The orthotropic and quadratic Hill criterion and the transverse isotropic yield function with associated flow rule are considered.
Ali KHALFALLAH, Hédi BEL HADJ SALAH, Abdelwaheb DOGUI
sensitivity analysis, inverse identification, plane tensile, elastoplasticity, FEM, anisotropy.