Effects of complex loadings on plastic deformation of stainless steel (SUS 304) at high temperature

The plastic deformation for complex loadings are experimentally investigated under various high temperature conditions. The experiments are conducted by subjecting thin wall tubular specimens to combined axial load and torsion. The stress-strain curves after plastic prestraining are obtained by subsequent loading along the stress path with corners. The subsequent loadings are given at a different temperature from that of the prestrained temperature. The effects of plastic prestraining as well as temperature history on the stress-strain curves are examined under variable temperature conditions. The stress-strain curves after creep straining are determined by subsequent loading at constant temperature. The effects of creep strain on plastic hardening are observed by comparison with the stress-strain curves without creep straining. The stress-strain curves for cyclic loading are obtained under various temperature conditions. The cyclic loadings are performed between fixed strain limits. The effects of cyclic loadings on the saturation properties of cyclic hardening are examined at constant and variable temperatures