An Enhanced Rousselier Model to Predict Ductile Fracture under a Wide Range of Loading Conditions
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The objective of this study is to propose an enhanced Rousselier model for predicting ductile fracture in metallic materials under a wide range of loading conditions. As is well known, ductile fracture is widely classified into pressure-dominated and shear-dominated types by the different damage mechanisms. The pressure-dominated fracture is represented by the combination of Rousselier model as the growth of voids depending on hydrostatic stress and the conventional void nucleation criterion from the primary inclusions. On the other hand, the shear-dominated failure is realized by the Tresca yield criterion as the formation of the shear band depending on Lode angle and the additional criterion as the subsequent void nucleation from the secondary inclusions due to the strain localization. Throughout numerical examples in which several types of specimens are utilized for a wide range of loading conditions, the capability of the proposed model is demonstrated by comparison with the conventional Rousselier model.
