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    Prediction of Critical Crack Size in Plastically Strained Welded Panels

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    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.


    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,

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP27721S