SEDL / STP / STP995V2-EB / STP27721S

Prediction of Critical Crack Size in Plastically Strained Welded Panels

Sumpter, JDG
Senior principal scientific officer, Admiralty,

Pages: 18    Published: Jan 1988

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Abstract

Fracture toughness data for two HY80 weld metals are used to illustrate the application of J^c 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. J^c 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. J^c is shown to be a clear function of crack depth for shallow cracks in bending. The use of J^c data from conventional deeply notched bend specimens results in very conservative critical crack size predictions.