STP514: The J Integral as a Fracture Criterion

    Begley, JA
    Westinghouse Research Laboratories, Pittsburgh, Pa.

    Landes, JD
    Westinghouse Research Laboratories, Pittsburgh, Pa.

    Pages: 23    Published: Jan 1972


    Abstract

    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.

    Keywords:

    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


    Paper ID: STP38816S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP38816S


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