Comparison of Different Biaxial Tests for the Inverse Identification of Sheet Steel Material Parameters

The aim of this work is to compare different biaxial specimen geometries and loading conditions concerning their applicability as experimental database for an inverse finite element model updating procedure to identify the material parameters of sheet steel. Therefore, the deformation of the specimens is recorded with an optical, three-dimensional full-field deformation measurement system, and the utilised displacement data at the surface of the specimens are calculated via digital image correlation. The numerical material model for the simulations is based on a three-dimensional, anisotropic elasto-plastic ansatz and is implemented into a commercial finite element software code. The material parameters that are identified with the different specimen geometries are the hardening variables and the anisotropic plastic values. Based on the identification results, a selection criterion for the evaluation of specimen geometries for the inverse parameter identification is presented.