STP856

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

    Published: Jan 1985


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    Abstract

    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.

    Keywords:

    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


    Paper ID: STP34536S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP34536S


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