STP942

    Thermal Mechanical Fatigue of Cast René 80

    Published: Jan 1988


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    Abstract

    Hot path components of aircraft engines contain complex thermal and mechanical fields which can interact to produce thermal mechanical fatigue (TMF) failure. Development of a model of thermal mechanical fatigue for cast René 80 is underway through TMF experiments, a series of isothermal tests, and finite element analysis. The modelling effort consists of two parts, the determination of a suitable damage parameter and a technique for calculating the quantities required by the damage parameter. Classical plasticity theory was employed in a finite element code to model the TMF deformation. The predicted hysteresis loops were compared to the experimental values; the correlation was excellent for both the in-phase and out-of-phase cycles at 871 to 982°C but not as good as 760 to 871°C. The thermal cycle variation in these tests is limited, but the model's ability to correlate the TMF lives and predict the constitutive behavior of a material whose behavior changes with temperature provides optimism that this analysis may be applied to other TMF situations.

    Keywords:

    nickel-base superalloy, elevated temperature fatigue, thermomechanical fatigue, fatigue life prediction, inelastic finite element analysis, cyclic constitutive behavior


    Author Information:

    Cook, TS
    General Electric Company, AEBG, Cincinnati, OH

    Kim, KS
    General Electric Company, AEBG, Cincinnati, OH

    McKnight, RL
    General Electric Company, AEBG, Cincinnati, OH


    Paper ID: STP24515S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24515S


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