STP743

    A Model for Representing and Predicting the Influence of Hold Time on Fatigue Crack Growth Behavior at Elevated Temperature

    Published: Jan 1981


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    Abstract

    An analytical model is developed to represent and predict the influence of hold time on fatigue crack growth behavior at elevated temperature where creep deformation is significant. This model was formulated by considering the relaxation of stress in the crack-tip region due to creep deformation and its influence on the crack-growth behavior during the hold time.

    Fatigue crack growth rate data at various hold times were obtained for ASTM A470 Class 8 (chromium-molybdenum-vanadium) steel at 538°C (1000°F) to evaluate the model. Based on these results and the data taken from the literature on Inconel alloy 718, it was concluded that the proposed model is capable of accurately representing and predicting the effect of hold time on the fatigue crack growth behavior at elevated temperature. This model represents a significant improvement over the linear damage summation model used previously. Some limitations of the model are also discussed.

    Keywords:

    creep, fatigue, fracture mechanics, stresses, intensity, Inconel 718, cracks, parameters, chromium-molybdenum-vanadium steel


    Author Information:

    Saxena, A
    Senior engineers, Structural Behavior of Materials Department, Westinghouse R&D Center, Pittsburgh, Pa.

    Williams, RS
    Senior engineers, Structural Behavior of Materials Department, Westinghouse R&D Center, Pittsburgh, Pa.

    Shih, TT
    Senior engineers, Structural Behavior of Materials Department, Westinghouse R&D Center, Pittsburgh, Pa.


    Paper ID: STP28792S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP28792S


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