| Abstract: | Quantitative comparisons are drawn between the predictions of three kinds of multiaxial anisotropic creep constitutive equations (the author's model, the Murakami-Ohno model and the Mróz-Trampczynski-Hayhurst model) with special consideration of repeated stress changes. Numerical simulations of these anisotropic creep models are performed regarding the creep behavior observed for type 304 stainless steel at 650 °C under repeated multiaxial nonproportional loading conditions. From these results, it is shown that these creep models can reproduce fairly well the observed anisotropic creep behavior and that the predictive capabilities are almost comparable with each other. The similarities and differences between them are also discussed within the context of the structure of the theories and the procedure to determine the material constants involved. |
