Results of nonproportional stress changes on creep and plastic strains resulting from abrupt changes in proportion of tension and torsion are reported. Both step-up and step-down changes are included. Constitutive equations based on data for single step creep and recovery tests previously reported are used to describe the test results. A viscous-viscoelastic model with aging effects and modifications for step-down tests predicted the creep behavior reasonably well. The prediction of time-independent plastic strains is also described.
Creep and Plastic Strains Under Side Steps of Tension and Torsion for 304 Stainless Steel at 593°C
Cho, U. W., and Findley, W. N. (September 1, 1983). "Creep and Plastic Strains Under Side Steps of Tension and Torsion for 304 Stainless Steel at 593°C." ASME. J. Appl. Mech. September 1983; 50(3): 580–586. https://doi.org/10.1115/1.3167094
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