Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 43, Issue 17, Pages 5217-5227Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2005.07.049
Keywords
semi-circular bend specimen; mode II fracture toughness; stress intensity factor; T-stress; brittle fracture
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The cracked semi-circular specimen subjected to three-point bending has been recognized as an appropriate test specimen for conducting mode I, mode II and mixed mode I/II fracture tests in brittle materials. The manufacturing and pre-cracking of the specimen are simple. No complicated loading fixture is also required for a fracture test. However, almost all of the theoretical criteria available for mixed mode brittle fracture fail to predict the experimentally determined mode II fracture toughness obtained from the semi-circular bend (SCB) specimen. In this paper, a modified maximum tangential stress criterion is used for calculating mode II fracture toughness K-IIc in terms of mode I fracture toughness K-Ic. The modified criterion is used for predicting the reported values of mode II fracture toughness for two brittle materials: a rock material (Johnstone) and a brittle polymer (PMMA). It is shown that the modified criterion provides very good predictions for experimental results. (c) 2005 Elsevier Ltd. All rights reserved.
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