Abstract:Tensile stress-strain curves of five metallic alloys, i.e., SKH51, STS316L, Ti-6Al-4V, Al6061 and Inconel600 were analyzed to investigate the working hardening behavior. The constitutive parameters of three constitutive equations, i.e., the Hollomon, Swift and Voce equations, were compared by using different methods. A new working hardening parameter was proposed to characterize the working hardening behavior in different deformation stages. It is found that Voce equation is suitable to describe stress-strain curves in large strain region. Meanwhile, the predicting accuracy of ultimate tensile strength by Voce equation is the best. The working hardening behavior of SKH51 is different from the other four metallic alloys.

Key words: constitutive equation; tensile stress-strain behavior; piecewise fitting; coordinate transformation