Constitutive parameters identification for elastoplastic materials in finite deformation

In this contribution, inverse identification methods of constitutive laws for elastoplastic behaviour are compared. These proposed inverse algorithms are composed on a finite element calculation combined with an optimisation procedure. They are applied to identify material anisotropic coefficients using a set up of easy performed tests. The used experimental data are the plane tensile test and the off axes tensile tests. The data correspond to various virtual elastoplastic orthotropic materials where quadratic or non quadratic criteria with or without associated normality are considered. Three identification methods are compared to find anisotropic parameters. Particular attention is devoted to the impact of the hypothesis on identified parameters.