STP1189

    Growth of Surface Cracks During Large Elastic-Plastic Loading Cycles

    Published: Jan 1993


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    Abstract

    Thin Inconel 718 plates with deep elliptical surface flaws are subjected to large loading cycles under both load and displacement control. Closed-form estimates of the J-integral for surface flaws in finite thickness plates are derived with a modified reference stress method and compared with recent elastic-plastic finite element results. A J-resistance curve for the surface-cracked configuration is developed and compared with data from thick compact tension specimens. Special attention is given to the apparent relationship between ductile tearing and low-cycle fatigue crack growth mechanisms and rates.

    Keywords:

    elastic-plastic fracture mechanics, J, -integral, resistance curves, surface cracks, fatigue crack growth, ductile tearing, range marking, crack shape, crack closure, fracture mechanics, fatigue (materials)


    Author Information:

    McClung, RC
    Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

    Hudak, SJ
    Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

    Bartlett, ML
    Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX

    FitzGerald, JH
    Senior research engineer, manager, research engineer, and senior engineering technologist, Southwest Research Institute, San Antonio, TX


    Paper ID: STP24273S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP24273S


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