ASTM WK46990

    Revision of E1820 - 13 Standard Test Method for Measurement of Fracture Toughness

    (What is a Work Item?)

    Active Standard: E1820 - 13

    Developed by Subcommittee: E08.07 | Committee E08 | Contact Staff Manager



    WK46990

    1. Rationale

    This item is a reballot of revisions to Annex A11 originally proposed in Ballot E08(14-01). This latest revision addresses concerns expressed by a persuasive negative vote on the prior ballot. This revision adds a requirement that for the case of unstable crack extension during the test, at least one data point must lie between the 0.2 mm and 0.5 mm offset lines when determining Q. Under the original proposal, it was permissible to have all four data points lie between the 0.15 and 0.2 mm offset lines and the power law fit could be extrapolated to the intersection with the 0.2mm offset line. This is no longer the case.


    Keywords

    crack initiation; crack-tip opening displacement; CTOD; ductile fracture; elastic-plastic fracture toughness; fracture instability; J-integral; JIc; KJic; Jc; δc; plane-strain fracture toughness; resistance curve; stable crack growth;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    08-12-2014

    Technical Contact:
    James Joyce

    Status:
    Draft Under Development