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    The J Integral as a Fracture Criterion

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    The path independent J integral, as formulated by Rice, can be viewed as a parameter which is an average measure of the crack tip elastic-plastic field. This together with the fact that J can be evaluated experimentally, makes a critical J value an attractive elastic-plastic fracture criterion. The JIc fracture criterion refers to crack initiation under plane strain conditions from essentially elastic to fully plastic behavior.

    Experiments supporting the validity of a JIc fracture criterion are presented in this paper. Values of the J integral were determined experimentally for two steel alloys, one of low and the other of intermediate strength. A review is given of the analytic support for the JIc fracture criterion. The range of applicability of the JIc concept, its limitations, and its advantages are also discussed.


    fracture (materials), failure, cracking (fracturing), crack initiation, elastic theory, plastic theory, tensile properties, stress strain diagrams, bend tests, analyzing, steels, rotor steels, pressure vessel steels

    Author Information:

    Begley, JA
    Westinghouse Research Laboratories, Pittsburgh, Pa.

    Landes, JD
    Westinghouse Research Laboratories, Pittsburgh, Pa.

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP38816S