Development of new experimental test for sheet metals through-thickness behaviour characterization

The present work proposes a new testing system to evaluate the through-thickness shear behaviour of anisotropic sheet metals, that can be employed in identification methods such as the Virtual Fields Method (VFM) and the Finite Element Model Updating (FEMU). In fact, only the planar components of anisotropy are usually considered due to assumption of plane stress condition, and the through-thickness shear behaviour can be relevant in the prediction of failure models and plastic instabilities in such industrial applications where localized shear occurs during metal forming processes. The new experimental protocol is based on the application of Unnotched Iosipescu test to large strain plasticity, using DIC for the thickness surface displacement measurement. Here, a first configuration of the experimental set-up is tested employing specimens obtained from 5355 steel blank. Then, the test performed is used to identify the anisotropy shear parameter in the thickness plane of constitutive model Hi1148 via FEMU method.