Validation of Simple Shear Tests for Parameter Identification Considering the Evolution of Plastic Anisotropy

Abstract

The evolution of plastic anisotropy plays a key role for an accurate computational springback prediction in complex, multistage forming processes. In many studies, the identification of material parameters is based on experimental results from shear testing because this technique allows for large plastic deformations without facing stability problems that occur, for instance, during uniaxial tensile testing. However, little is known about the   comparability of different shear test setups. In this study, we systematically compare two quite different and widelyused setups for the simple shear test, the Miyauchi setup and the Twente setup. In the shear tests performed on an AA6016 aluminum alloy sheet, we observed a good agreement for the flow stresses measured with the two different   setups. We then use the mechanical data for the identification of a phenomenological model of the evolution of plastic anisotropy, and we demonstrate the importance of consistent and reliable experimental data studying a model for combined isotropic-kinematic hardening.