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.
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