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    STP1060

    Measurements of CTOD and CTOA Around Surface-Crack Perimeters and Relationships Between Elastic and Elastic-Plastic CTOD Values

    Published: 01 January 1990


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    Abstract

    A difficulty associated with predicting structural integrity is that the surface cracks found in structural components are three-dimensional whereas the crack-tip opening displacement (CTOD) and J-integral analytical techniques were derived from two-dimensional theory. This paper provides data from specimens containing surface cracks (aspect ratio either 0.1 or 0.5 and crack depth-to-thickness ratio 0.6); presents measured values of CTOD, crack-tip opening angle (CTOA), and Δa; provides experimental results relative to the center of rotation and the use of the Newman-Raju solutions for predicting the variation in CTOD around the crack perimeter; and evaluates possible correlations between CTOD, CTOA, and Δa.

    Keywords:

    fracture toughness (, K, Ic, , K, crit, , CTOD, CTOA), Surface cracks


    Author Information:

    Reuter, WG
    Principal engineer and senior engineer, Idaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID

    Lloyd, WR
    Principal engineer and senior engineer, Idaho National Engineering Laboratory, EG&G Idaho, Inc., Idaho Falls, ID


    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP23433S