SEDL / STP / STP612-EB / STP27895S

Life Prediction of Thermal-Mechanical Fatigue Using Strainrange Partitioning

Halford, GR
Engineer, Lewis Research Center, National Aeronautics and Space Administration, Cleveland, Ohio

Manson, SS
Professor, Case Western Reserve University, Cleveland, Ohio

Pages: 16    Published: Jan 1976

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Abstract

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.