Effect of

Anisotropic yield surface description is required to perform numerical simulation of forming processes such as stamping. The BBC2005 criterion, available in AutoForm software, is well adapted for aluminium alloys. This model requires the tuning of 8 parameters including ab and rb, respectively the bulge yield stress and the ratio of strain in the two directions of the sheet plane. Nevertheless, there is not strict consensus on how these values can be identified from bulge test. The different methods that can be found in the literature are reviewed and tested on 8 different aluminium alloys from 5xxx and 6xxx families. Based on numerical simulations of stamping of representative industrial automotive parts, the sensitivity of modelling results to the ab and rb values is shown and the selection of the most appropriate identification method is discussed.