STP995V2

    Prediction of Critical Crack Size in Plastically Strained Welded Panels

    Published: Jan 1988


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    Abstract

    Fracture toughness data for two HY80 weld metals are used to illustrate the application of Jc as a fracture analysis parameter in a form analogous to that developed in the United Kingdom for critical crack-tip opening displacement, c, testing and analysis. Jc results from dynamically tested, shallow-surface-notched, welded bend specimens are shown to correlate well with the crack size and plastic strain levels required to initiate unstable fracture in fatigue-cracked Pellini bulge explosion test panels. Jc is shown to be a clear function of crack depth for shallow cracks in bending. The use of Jc data from conventional deeply notched bend specimens results in very conservative critical crack size predictions.

    Keywords:

    fracture, mechanical properties, J, -contour integral, dynamic loading, Pellini bulge test, elastic-plastic fracture mechanics, fracture mechanics, nonlinear fracture mechanics


    Author Information:

    Sumpter, JDG
    Senior principal scientific officer, Admiralty,


    Paper ID: STP27721S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP27721S


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