Evaluation of inelastic constitutive models under plasticity-creep interaction in multiaxial stress state: The second report of the benchmark project (A) by the Subcommittee on Inelastic Analysis and Life Prediction of High Temperature Materials, JSMS

Abstract

Some of the results of the benchmark study on the evaluation of constitutive models are presented as the second phase of the project by the Subcommittee on Inelastic Analysis and Life Prediction of High Temperature Materials, JSMS. By specifying normalized and tempered 2 1 4 Cr−1 Mo steel at 600°C, fourteen kinds of experiments of six categories were performed in combined stress states of tension and torsion: (I) simple and cyclic plastic straining and creep under tension or torsion, (II) multiaxial loading under mixed modes of plasticity and creep, (III) straining along cruciform and circular paths, and stressing along creep in circular path, (IV) mechanical ratcheting under cyclic torsion combined with tensile stress, (V) in-phase cyclic straining, and (VI) out-of-phase cyclic straining. The experimental results of these benchmark tests are compared with the corresponding predictions by ten constitutive models to evaluate their accuracy in simulating the actual behaviour of the material.