Abstract
Abstract A method for calibration of anisotropic yield criteria based on yield stresses obtained in tensile and bending tests is developed. It is thus possible to calibrate anisotropic criteria by means of simple tests without using the R -ratios in combination with the associated flow rule. Explicit formulas are derived for the calibration of Hill's yield criterion, while a numerical procedure is developed for calibration of the Barlat and Lian yield criterion. Results from tensile and bending tests on the aluminium alloy AA 7108 in temper T76 are presented. Tests in three material directions are carried out in order to characterise the plastic anisotropy of the alloy. In the tensile tests the stress–strain curves and the R -ratios are determined, whereas the bending tests establish the moment–curvature curves.
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