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This paper describes the features of the method of strainrange partitioning that make it applicable to the life prediction of thermal-mechanical strain-cycling fatigue. An in-phase (230 to 760°C) test on Type 316 stainless steel is analyzed as an illustrative example. The method utilizes the recently proposed step-stress procedure of experimental partitioning, the interaction damage rule, and the life relationships determined at an isothermal temperature of 705°C. Implications of the present study are discussed relative to the general thermal fatigue problem.
thermal fatigue, intergranular fracture, plastic strain, creep strain, life prediction, strainrange partitioning, stainless steels
Engineer, Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio
Professor, Case Western Reserve University, Cleveland, Ohio