SEDL / STP / STP1122-EB / STP24155S

Application of a Thermal Fatigue Life Prediction Model to High-Temperature Aerospace Alloys B1900 + Hf and Haynes 188

Halford, GR
Senior Research Engineer, NASA-Lewis Research Center, Cleveland, OH

Saltsman, JF
Research Engineer, NASA-Lewis Research Center, Cleveland, OH

Verrilli, MJ
Research Engineer, NASA-Lewis Research Center, Cleveland, OH

Arya, V
NASA Resident Research Associate, University of Toledo, Toledo, OH

Pages: 13    Published: Jan 1992

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Abstract

This paper presents the results of the application of a newly proposed thermomechanical fatigue life prediction method to a series of laboratory TMF results on two high-temperature aerospace engine alloys: cast B1900 + Hf and Haynes 188. The method, referred to as TMF/TS-SRP, is based upon three relatively recent developments: the Total Strain version of the method of Strainrange Partitioning (TS-SRP), the bithermal testing technique for measuring TMF behavior, and advanced viscoplastic constitutive models. The high-temperature data reported in a companion paper are used to evaluate the constants in the model and to provide the TMF verification data to check its accuracy. Predicted lives are in agreement with the experimental lives to within a factor of approximately 2.