STP1389

    The Technical Basis for ASTM E 1820-98 Deformation Limits on JC

    Published: Jan 2000


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    Abstract

    ASTM Standard Test Method E 1820-96, “Measurement of Fracture Toughness,” was recently revised (E 1820-98). This revision includes a relaxation of the deformation limits/size requirements that must be satisfied to report a valid value of fracture toughness at instability prior to significant stable crack extension (JC). E 1820-96 required that valid JC values satisfy the following inequality (with an M value of 200). Bb0MJcσflow E 1820-98 relaxes this requirement to M = 100 for all metals and to M = 50 for ferritic steels. In this paper we present results from both finite element analysis and from fracture toughness testing that supports these changes. This evidence demonstrates that JC values meeting the deformation limits of E 1820-98 are specimen-size invariant. Consequently, these values can be applied with confidence in fracture integrity assessments of much larger structures.

    Keywords:

    fracture toughness testing, cleavage fracture toughness, deformation limits, size requirements, JC, constraint, ferritic steels


    Author Information:

    Kirk, MT
    Senior materials engineer, Office of Nuclear Regulatory Research, United States Nuclear Regulatory Commission, Washington, DC

    Lott, RG
    Advisory engineer, Westinghouse Electric Co., LLC, Pittsburgh, PA


    Paper ID: STP14801S

    Committee/Subcommittee: E08.93

    DOI: 10.1520/STP14801S


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