STP856

    A Comparison of Crack-Mouth Opening and Load-Line Displacement for J-Integral Evaluation Using Bend Specimens

    Published: Jan 1985


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    Abstract

    The measurement of the displacement at the crack mouth of three-point bend specimens is compared to the measurement of load-line displacement for crack-length and J-integral evaluation. For crack-length determination by the unloading technique, the correction that must be made when using a clip gage mounted on knife edges is derived from load-line and crack-mouth opening displacements expressed as a function of crack length. Experimental results with tough steels show excellent agreement between the crack lengths determined by the two types of displacement measurements. The J integral can be evaluated using either method. The agreement between the two methods of J evaluation depends essentially on the evaluation of crack length. It is concluded that the J integral may be measured easily with a clip gage mounted at the crack mouth of three-point bend specimens.

    Keywords:

    pressure vessels, unloading, modulus of elasticity, pressure vessel steel, three-point bend test, unloading technique, crack-mouth opening, crack-length evaluation, J integral


    Author Information:

    Faucher, B
    Research scientist and section head of Engineering and Metal Physics Section, CANMET, Physical Metallurgy Research Laboratories, Ottawa, Ontario

    Tyson, WR
    Research scientist and section head of Engineering and Metal Physics Section, CANMET, Physical Metallurgy Research Laboratories, Ottawa, Ontario


    Paper ID: STP34530S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP34530S


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