抄録
In this work a material parameter identification procedure is presented which utilizes optical full-field displacement measurement data and digital image correlation. It is based on the Finite Element Model Updating (FEMU) principle and is controlled via an optimization algorithm. The parameters which are identified define the shape of the initial yield surface. The numerical material model is based on an orthotropic elasto-plastic approach at finite strain with a Hill-type yield function. The model is implemented into a commercial Finite Element (FE) simulation software tool. The tested material is a 2.0mm DC04 sheet steel which shows orthotropic characteristics. The objective is to identify the optimal material parameters at minimal experimental costs. The utilization of a biaxial tensile test with a self-designed specimen geometry leads to very well fitting results. The parameters identified with the FEMU procedure are verified through experimental testing by performing uni- and biaxial tensile and compression and shear tests.
