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    STP1207

    Fracture Criteria for Surface Cracks in Brittle Materials

    Published: 01 January 1994


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    Abstract

    If a structural material behaves in a linearly elastic manner, it is generally assumed that plane-strain fracture toughness (KIc) and a proven equation for calculating an applied stress-intensity factor can be used to predict conditions for catastrophic fracture. The adequacy of this approach has been verified for some specific applications, generally through-cracks in plate material. Recent fracture test results and analyses of surface cracks in brittle materials have raised a concern about the validity of using KIc and the maximum value of the calculated stress-intensity factors to predict fracture conditions. This paper presents test data and results obtained from different procedures, all based on KIc, for predicting failure for three-dimensional surface cracks.

    Keywords:

    surface crack, plane-strain fracture toughness, metal, ceramic


    Author Information:

    Reuter, WG
    Principal engineer, Idaho National Engineering Lab., EG&G Idaho, Idaho Falls, ID

    Newman, JC
    Senior scientist, NASA-Langley Research Center, Hampton, VA

    Macdonald, BD
    Principal engineer, Knolls Atomic Power Lab., Schenectady, NY

    Powell, SR
    Engineering specialist, Bell Helicopter Textron, Fort Worth, TX


    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP13729S