The Unloading Compliance Method for Crack Length Measurement Using Compact Tension and Precracked Charpy Specimens

    Published: Jan 1985

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    The unloading compliance method has been used to measure crack lengths during the fracture toughness testing of an A508 Class II (Unified Numbering System [UNS] K12766) steel. It is shown that accurate crack length predictions (within ±4%) can be achieved by accounting for the extraneous compliance inherent in the testing fixture. Both precracked Charpy and 25-mm compact tension specimens have been tested over the temperature range − 150 to 300°C. From a comparison of the data, an assessment of the capability of precracked Charpy specimens to measure the fracture toughness of pressurized water reactor (PWR) steels is made.


    fracture tests, steels, unloading, A508 steel, unloading compliance method, extraneous compliance, crack length predictions, fracture toughness, temperature range, compact tension specimen, precracked Charpy specimen, pressurized water reactor (PWR)

    Author Information:

    Neale, BK
    Research officers, Berkeley Nuclear Laboratories, Berkeley, GloucestershireGL

    Priest, RH
    Research officers, Berkeley Nuclear Laboratories, Berkeley, GloucestershireGL

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP34536S

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