Effect of Different Yield Criteria and Material Parameter Identification Methods on the Description Accuracy of the Anisotropic Behavior of 5182-O Aluminum Alloy

Based on the BBC2005 yield criterion, a material model that accounts for the deformation anisotropy of sheet metals is developed, named the BBC2005-different work hardening (BBC05-DWH) yield criterion. In contrast to the standard formulation, in this model the material parameters depend on the equivalent plastic strain. To evaluate the different material models, uniaxial and biaxial tensile tests and hydraulic bulging tests are carried out on a 5182-O aluminum alloy produced by Kobelco. The results show that predictions based on the developed material model are more accurate than predictions based on three other yield criteria that use different material parameter identification methods (Hill48-r, Hill48-σ, Barlat89-r, Barlat89-σ and BBC2005 yield criteria). The developed material model is also used to modify the hardening curve produced by the hydraulic bulging test. In the process of extrapolating the hardening curve in the reference direction, the influences of different yield criteria, material parameter identification methods and different work hardening behavior on the equivalent stress are discussed.