Assessing Coefficients of the Barlat Yield Criterion for Anisotropic Aluminum Alloy Sheets by Means of the Evolutionary Strategy

The aggregate-objective optimization technique has been used to assess the optimal set of coefficients of the Barlat yield criterion for anisotropic alloy sheets by means of the evolution strategy. The aggregate-objective problem has been quantified by the Euclidean-type objective function. Computational results indicate that standard procedures, based on three uniaxial yield stresses for different directions of loading in-plane, the balanced biaxial yield stress, and three Lankford coefficients of anisotropy determined for three different directions of loading in-plane, cannot be sufficient to assess unequivocally the Barlat yield criterion for anisotropic alloy sheets.