Hole-Expansion: Sensitivity of Failure Prediction on Plastic Anisotropy Modeling

The influence of yield function parameters on hole-expansion (HE) predictions are investigated for an anisotropic AA6022-T4 aluminum sheet. HE experiment is performed in a fully-instrumented double-action hydraulic press with flat-headed punch. Full strain fields measured by stereo-type digital image correlation (DIC) system. stress state gradually changes from uniaxial to plane-strain tension biaxial the radial direction. Besides HE, plastic anisotropy characterized and experiments. Uniaxial considered as most important, since it along hoop direction hole. For finite element (FE) simulation, Yld2000-2d non-quadratic used two different parameter sets, calibrated by: (1) only (termed Calib1) and, (2) both (Calib2). field show good agreement experiments Calib2, which takes into account well tension. This indicates importance modes, particular tension, adopted produce accurate simulations.