Abstract
In this study, effects of viscosity and aging on plastic behavior of A7475 aluminum alloy under biaxial loading and in stress relaxation at several temperatures, are investigated experimentally, and are analyzed theoretically based on the Two-Factors constitutive concept, which means the overstress concept including aging effect. As much as temperature become higher, viscosity stress increases, on the other hand, aging stress decreases. Both viscosity and aging in axial loading are larger than those in torsional loading. The model based on Two-Factors constitutive concept gives systematic predictions on both plastic flow behavior and relaxation behavior for each loading direction.
