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    Near-Threshold Fatigue Crack Growth Prediction under Spectrum Loading

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    A constant crack closure stress-based model assuming the absence of a threshold stress intensity range under spectrum loading forms the basis for a simple procedure to predict crack growth under spectrum loading. The procedure requires material constants that can be derived from constant amplitude fatigue crack growth tests at two stress ratios: (1) at a high stress ratio in the absence of fatigue crack closure, and (2) at a stress ratio corresponding to the most severe cycle under the load spectrum of interest. Crack growth estimates were compared with available experimental data for a variety of materials and load spectra.


    fatigue crack, spectrum loading, Rainflow analysis, fatigue crack closure, threshold stress intensity

    Author Information:

    Sunder, R
    National Aeronautical Laboratory, Bangalore,

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP24158S