STP687

    Assessment of the Sensitivity of Crack Growth Rate Constants to Predictive Accuracy of Part-Through Crack Fatigue Life Predictions

    Published: Jan 1979


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    Abstract

    Fatigue crack life predictions were performed for specimens containing part-through cracks subjected to constant-amplitude loading. A computer routine, EFFGRO, was employed in the crack growth predictions. Three rounds of predictions were made by using different crack growth rate constants derived from the compact- type (CT) specimen da/dN versus ΔK data. The predictive accuracies of each round of predictions were assessed. The results show that accurate predictions of part-through crack fatigue lives using CT specimen crack growth rate data can be achieved if there are known part-through crack test data serving as guidelines.

    Keywords:

    fatigue life prediction, part-through crack, constant amplitude, aluminums, stress intensity factor, crack propagation, fatigue (materials)


    Author Information:

    Chang, JB
    Member of technical staff, Fatigue and Fracture Mechanics, Structures Systems, Rockwell International, Los Angeles, Calif.


    Paper ID: STP35038S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP35038S


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