Inverse Yield Locus Identification using a biaxial tension apparatus with link mechanism and displacement fields

Abstract

The main impetus for this work is the reduction of experimental work associated with yield locus identification of sheet metal through homogeneous tests. Inverse identification strategies have been devised to simultaneously extract a number of model parameters from an experiment leading to non-uniform stress and strain fields. Amongst them, the Finite Element Model Updating (FEMU) technique is probably the most intuitive approach for which conclusive proof of concept can be found in literature. A thorough understanding, however, of the key FEMU-ingredients and their impact on the identification of plastic anisotropy of sheet metal is currently missing. This paper scrutinizes via a virtual heterogeneous experiment the impact of the number and spreading of load steps, the boundary conditions and DIC settings on the identification of the yield locus.