STP868

    Evaluation of Analytical Solutions for Corner Cracks at Holes

    Published: Jan 1985


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    Abstract

    This paper evaluates four state-of-the-art stress intensity factor solutions for a single corner crack at a hole. The solutions considered are Newman and Raju's, Shah's, and Liu's one-dimensional and two-dimensional solutions. The analytical solutions are correlated with experimental stress intensity factors obtained using the James-Anderson backtracking technique. The analytical solutions are further evaluated through analytical/experimental correlations of subsequent crack growth lives and crack shape changes. The materials considered are polymethyl methacrylate (PMMA), which is a transparent polymer material, and 7075-T651 aluminum. Excellent correlations are obtained for Newman and Raju's as well as Shah's solutions. However, Liu's one-dimensional and two-dimensional solutions are unconservative.

    Keywords:

    stress intensity factor, corner crack, fastener hole, fatigue crack growth, crack shape aspect ratio, polymethyl methacrylate (PMMA), 7075-T651 Al, James-Anderson technique


    Author Information:

    Heckel, JB
    Aerospace Engineer, General Dynamics Corporation, Ft. Worth, TX

    Rudd, JL
    Aerospace Engineer, Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, OH


    Paper ID: STP34245S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP34245S


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