STP743: Stress-Intensity Factor for a Corner Crack at the Edge of a Hole in a Plate

    Palusamy, SS
    Fellow engineer and senior scientist, Westinghouse Nuclear Technology Division, Pittsburgh, Pa.

    Raymund, M
    Fellow engineer and senior scientist, Westinghouse Nuclear Technology Division, Pittsburgh, Pa.

    Pages: 18    Published: Jan 1981


    Abstract

    A corner-cracked hole in a plate, subjected to remote tension loading, is one of the three benchmark problems identified for the validation of three-dimensional techniques at the workshop held in Battelle Columbus Laboratories. Stress-intensity factor results for the case of circular corner crack obtained by the macroelement technique is presented in this paper. Results for the remote tension loading are compared with those obtained by the boundary-integral equation (BIE) method and three-dimensional finite-element technique based on singular elements.

    Since this investigation was carried out as a part of an overall program aimed at developing stress-intensity factor values for cracks in reactor vessel nozzles, results for six other crack surface loadings were obtained and compared with the results obtained by BIE method.

    For the case of remote tension loading, the results of the macroelement technique in the regions removed from the free surface agree within 2.5 percent of those obtained by BIE and the singularity finite-element method. For the case of crack surface loadings, the results of the macroelement technique are shown to be in good agreement with the BIE method throughout the crack front. Comparisons with the limited results available in the literature which take into account constraint variation at the free surface show that the macroelement results for the free surface will be too conservative for thermal shock applications. However, it is concluded that the macroelement technique will give reasonably accurate results for nozzle corner crack problems except in the regions of free surface.

    Keywords:

    corner crack, stress-intensity factors, surface flaws, fatigue (materials), finite-element analysis, pressure vessels


    Paper ID: STP28812S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP28812S


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