Prediction of mechanical behaviour of an ultra-thin sheet metal under non-proportional loading using a crystal plasticity model

A theoretical crystal plasticity model to predict mechanical responses of ultra-thin (<0.1 mm thick) sheet metal under non-proportional loading, which are difficult to measure experimentally due to premature buckling in simple shear or compression-tension test, was developed. In the model, three different dislocation density components, namely, forward, reverse and latent dislocations, were incorporated in the crystal plasticity model. The model was applied for 100 μm thick ultra-thin ferritic stainless steel sheet to predict mechanical responses under two-step tension, and the predicted results were compared with the experimental data. (paper)