Journal
ENGINEERING FRACTURE MECHANICS
Volume 103, Issue -, Pages 115-123Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2012.09.021
Keywords
Rock fracture toughness; Mixed mode loading; SCB specimen; Critical tangential stress; K-T model
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The semi-circular bend specimen subjected to three-point bending has received much attention in recent years for measuring the mixed mode I/II fracture resistance of rocks. In this paper, the experimental results reported in literature and obtained from fracture tests using the semi-circular bend specimen are revisited for several different rocks including marble, sandstone, limestone, and mudstone. It is shown that a two-term expression for the near-crack-tip stresses together with a criterion based on a fixed critical tangential stress under mixed mode loading provide very good estimates for the experimental results reported for mixed mode I/II fracture in the investigated rocks. (C) 2012 Elsevier Ltd. All rights reserved.
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