SEDL / STP / STP1172-EB / STP24719S

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

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

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

Pages: 7    Published: Jan 1992

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Abstract

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.