STP945

    Unloading-Compliance and Load-Drop Analysis of JIc Tests of Irradiated 348 Stainless Steel

    Published: Jan 1988


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    Abstract

    Procedures for determining J-integral fracture toughness were applied to load versus load-line displacement data from a series of three-point bend specimens of irradiated 348 stainless steel tested at 23 and 427°C. The ASTM Test Method for JIc, a Measure of Fracture Toughness (E 813-81) was emphasized, using both unloading-compliance and load-drop measures of crack growth.

    An effective modulus procedure was included in the unloading—compliance method using recently published load-line displacement results. Two procedures were used for calculating JIc from the J versus unloading-compliance crack growth plots: the linear fit procedure from ASTM Method E 813 and a power-law fit with a 0.2-mm offset value of JIc.

    Based on the results of these various procedures, conclusions were reached regarding the most consistent measures of fracture toughness from these data. Suggestions were given regarding the use of effective modulus with unloading-compliance measurement of crack growth and the limitations of the load-drop method for measuring crack growth.

    Keywords:

    J, Ic, tests, unloading compliance, load-line displacement, effective modulus, three-point bend specimen, side grooves, load drop


    Author Information:

    Underwood, JH
    Research engineer, U.S. Army Armament Research Development and Engineering Center, Watervliet, NY

    Haggag, FM
    Engineering specialist and principal engineer, Idaho National Engineering Laboratory, Idaho Falls, ID

    Reuter, WG
    Engineering specialist and principal engineer, Idaho National Engineering Laboratory, Idaho Falls, ID

    Haggag is currently with Battelle Columbus Laboratories, Columbus, OH


    Paper ID: STP23265S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP23265S


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