SYMPOSIA PAPER Published: 01 January 1992

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


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.

Author Information

Qizhi, W
Chongqing University, Chongqing, People's Republic of China
Xuefu, X
Chongqing University, Chongqing, People's Republic of China
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Developed by Committee: E08
Pages: 191–197
DOI: 10.1520/STP24719S
ISBN-EB: 978-0-8031-5219-9
ISBN-13: 978-0-8031-1480-7