STP590: Predicting Fatigue Crack Retardation Following a Single Overload Using a Modified Wheeler Model

    Gray, TD
    Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio

    Gallagher, JP
    Air Force Flight Dynamics Laboratory, Wright-Patterson Air Force Base, Dayton, Ohio

    Pages: 14    Published: Jan 1976


    Abstract

    A modification to the Wheeler fatigue crack retardation model is proposed. The modification allows the model to be used without reliance on data fitting and, therefore, without the subsequent limiting to a specific material or to a specific set of loading parameters. The new model is used to predict existing data for the number of delay cycles following a single overload in 2024-T3 aluminum, 4340 steel, and Ti-6A1-4V titanium alloy. All predictions were within essentially a factor of two of the experimental data.

    Keywords:

    crack propagation, retardation models, cyclic loads, stresses, residual stress, mechanical properties, fatigue (materials)


    Paper ID: STP33955S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP33955S


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