A Fracture Instability Data Qualification Limit

    Published: Jan 1991

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    The purpose of this work was to identify a fracture instability data qualification limit. Transition regime fracture data were sorted to disqualify those higher Jmax valued fracture instability data which had exhibited significant prior stable crack extension. Qualified data were identified as having Jmax values below the JIc scatterband. Disqualified data had more than double the average prior stable crack extension of qualified data and had Jmax values in or above the JIc scatterband. The higher Jmax values and significant crack extension of disqualified data appeared to have been associated with a loss of constraint. The data indicated that a specimen size requirement may be needed for elastic-plastic fracture instability data that is different from those for elastic fracture instability or elastic-plastic tearing onset data. However, the value of Jmax relative to the JIc scatterband seems more to the point of identifying data that undergo fracture instability prior to significant crack extension.


    transítion regime, elastic-plastic fracture

    Author Information:

    Macdonald, BD
    Principal engineer and lead engineer, General Electric Company, Schenectady, NY

    Oberdick, RH
    Principal engineer and lead engineer, General Electric Company, Schenectady, NY

    Hiser, AL
    Materials engineer, U.S. Nuclear Regulatory Commission, Washington, DC,

    Paper ID: STP16849S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP16849S

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