SEDL / STP / STP631-EB / STP35535S

Ductile Rupture Blunt-Notch Fracture Criterion

Begley, JA
professor, Mechanics Department, Westinghouse Research LaboratoriesOhio State University, PittsburghColumbus, Pa.Ohio

Logsdon, WA
professor, Mechanics Department, Westinghouse Research LaboratoriesOhio State University, PittsburghColumbus, Pa.Ohio

Landes, JD
professor, Mechanics Department, Westinghouse Research LaboratoriesOhio State University, PittsburghColumbus, Pa.Ohio

Pages: 9    Published: Jan 1977

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Abstract

A blunt-notch fracture criterion is proposed. The criterion is shown to be applicable for the initiation of ductile tearing in the plane-strain regime. Elastic to fully plastic behavior can be treated. Experiments have shown ductile crack initiation to occur at a J-integral value which is only a function of notch root radius. Two specimen geometries have been tested using a nickel-chromium-molybdenum-vanadium-rotor steel. The onset of ductile tearing from the notch tip was measured using the multiple specimen heat tinting resistance curve technique. Notch-root radii for blunt-notch compact-toughness specimens and center-notched panels varied from 0.10 in. (0.25 cm) to that of a fatigue precrack. Results are also presented for blunt-notch toughness tests of aluminum alloy 6061-T651 using compact-toughness specimens.