Abstract
Abstract The mechanical characteristics of two aluminium alloys, AA7108 and AA6063, have been investigated by means of uniaxial tensile tests. The experiments show that the alloys exhibit significant anisotropy in yield strength, plastic flow and ductility. Based on the experiments, some existing phenomenological models of elastoplasticity were examined. The ingredients of the models are a yield criterion, a flow rule and a strain-hardening rule. Three yield criteria proposed by Hill (1950) , Barlat and Lian (1989) , and Karafillis and Boyce (1993) were evaluated. None of these have been found to give a satisfactory description of the mechanical behaviour.
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