A hybrid VFM-FEMU approach to calibrate 3D anisotropic plasticity models for sheet metal forming

Abstract

Abstract. Recently, inverse methods such as the Virtual Fields Method (VFM) or the Finite Element Model Updating (FEMU), coupled with a full-field measurement technique, have been distinguished as efficient strategies for the calibration of complex plasticity models [1]. The use of heterogeneous strain fields, in fact, offers a larger amount of material information compared to the classical standard test, enriching the identification process and, in general, reducing the experimental effort for the calibration [2]. Here, an inverse identification framework is proposed for the calibration of a full-scale anisotropic plasticity model. The inverse identification procedure employs full-field information from two main experiments: a tensile test on double notched specimens for the calibration of the coefficients expressing the planar anisotropy, and an innovative Iosipescu-like test for the through-thickness shear ones. A hybrid approach is used with the VFM employed to identify the planar coefficients and the FEMU for the through thickness ones.