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The Numerical Failure Prediction by the Damage Model GISSMO in Various Materials of Sheet Metal

Responding to continuous demands for weight saving and enhancement of collision safety of vehicles, high-strength steel sheets are widely used for car bodies. Also, the applications of aluminum sheets are increasing for seeking more lightweight, recently. In applying sheet metals with thinner thickness and higher strength to car bodies, numerical fracture predictions are strongly required to ensure collision safety, since the reduction of ductility becomes key issure for these materials. As a failure model, we use a well examined damage model GISSMO which includes incremental formulation for the description of material instability and localization. In this study, failure curves for GISSMO are identified by experimental data. Numerical failure prediction using GISSMO is conducted for the quasi-static axial crush test of HAT member. Based on experimental and numerical results, validity of the damage model GISSMO for high strength steel and aluminum alloy sheets are discussed.