STP803V1

    Evaluation of Plate Specimens Containing Surface Flaws Using J-Integral Methods

    Published: Jan 1983


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    Abstract

    Using annealed Type 304 stainless steel plate specimens containing ellipsoidal, rectangular, or triangular-shaped surface flaws, critical values of J are calculated for three separate situations: (1) the assumption that the specimen consists of a single-edge notch (SEN) and two unflawed specimens, (2) the prediction of an equivalent-length through-thickness defect for the surface flaw, and (3) the use of an equation developed by Paris. It was concluded that Jinit (Charpy specimen) and JIc cannot be used to successfully predict structural integrity using any of the three approaches for the 6.4-mm-thick (0.25-in.) annealed Type 304 stainless steel.

    Since it was not possible to develop a comparison between the absolute values of Jinit (from the surface-flawed specimen) and JIc, an attempt was made to evaluate a possible relative agreement. Values of Jinit and Jpen from only those specimens containing rectangular-shaped defects were used to calculate ΔJα. The average values agree reasonably well with those obtained in the open literature.

    Keywords:

    surface flaws, J-integral, Type 304 stainless steel, Δ, J, /Δ, a, elastic-plastic fracture


    Author Information:

    Reuter, WG
    Senior engineering specialist, and engineer, Materials Technology Division, EG&G Idaho, Inc., Idaho Falls, Idaho

    Chung, DT
    Senior engineering specialist, and engineer, Materials Technology Division, EG&G Idaho, Inc., Idaho Falls, Idaho

    Eiholzer, CR
    engineer, Materials Technology Division, EG&G Idaho, Inc., Idaho Falls, Idaho


    Paper ID: STP37311S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP37311S


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