Prediction of forming limit diagrams using the Phi-model and the Marciniak Kuczynski Model
Résumé
Without taking into account the evolution of the material microstructure such as texture development during simulation of sheet metal forming processes, it is impossible to accurately predict the plastic deformation, the anisotropy and the Forming Limit Diagrams (FLD) of metals. Crystal plasticity based models are often used and are required in simulations. One of them is the viscoplastic phi-model which predicts results that span from the upper bound (Taylor model) to the lower bound (Static model) approaches [1-2]. Many localization criteria have been developed and are used for the construction of FLD [3-4]. Here, we propose the prediction of localized necking using consideration of texture development. The construction of advanced FLD will be performed by the coupling of the phi-model and the Marciniak-Kuczynski model [5]. FLD for fcc metals under many assumptions and for various values of phi, which controls the strength of the interactions in the polycrystal, are presented.