ABSTRACT
The paper deals with aspects of anisotropic elastoplastic analysis at finite strain. The material model is based on the multiplicative decomposition of the deformation gradient. An anisotropic elastic constitutive law, described in invariant setting by the use of structural tensors, is presented. An anisotropic Hill-type yield criterion, described by an Eshelbylike stress tensor and further structural tensors, is developed. It considers nonlinear isotropic hardening as well. Explicit results for the specific case of orthotropic anisotropy are given. An accurate and trivial wise objective integration algorithm employing the exponential map is given. The numerical example demonstrates the influence of anisotropy on the elastoplastic deformation process as well as the robustness and accuracy of the proposed formulation.