Rock Fracture Toughness Determination with Chevron-Notched and Straight-Through-Notched Three-Point Bend Round Bar Specimens

    Published: Jan 1992

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    Chevron-notched and straight-through-notched three-point bend round bar specimens were used to test fracture toughness of a Chongqing limestone. Comparable values were obtained from these two kinds of specimens, but the chevron-notched specimens had the merits of easiness for deducing and detecting overloading, less the possibility for deviation of crack growth from notch plane, and a included nonlinear correction factor in fracture toughness calculation. However, there was some size effect for chevron-notched specimens; the test values increased with increment in crack length and diameter.


    chevron notch, straight-through notch, three-point bend, round bar, rock fracture toughness, stable crack growth, nonlinear correction factor, size effect

    Author Information:

    Qizhi, W
    Associate Professor and Professor, Chongqing University, Chongqing,

    Xuefu, X
    Associate Professor and Professor, Chongqing University, Chongqing,

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP24719S

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