Abstract
Three kinds of testing methods for mode II fracture toughness of rock materials, antisymmetric four-point bending test, direct shearing test and compression-shear test, were studied experimentally and numerically. It is concluded that mode II fracture can be successfully achieved in both four-point bending and direct shearing specimens with guiding-grooves and also in compression-shear specimens. The magnitude of Knc is about 2-3 times that of K, c and may be regarded as the mode II fracture toughness of rock.
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CITATION STYLE
Rao, Q. H., Stillborg, B., Sun, Z. Q., Wang, G. Y., & Xu, J. C. (1999). Mode II fracture toughness testing of rock. In 9th ISRM Congress (pp. 731–734). International Society for Rock Mechanics.
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