Abstract

Cracked rock masses are usually subjected to complex loading conditions. Therefore, it is among favorite concepts for rock fracture researchers to investigate the fracture of rocks under mixed mode I/II loading. There are numerous experimental studies on mixed mode I/II fracture of rocks using different test specimens. Semi-circular bend (SCB) specimen is one of the favorite test configurations for conducting mixed mode fracture toughness experiments in rock materials. This specimen is simple and its manufacturing is inexpensive. By changing the parameters a/R, S/R and β(see Fig. 1), the SCB specimen can provide pure mode I, pure mode II and any combination of modes I and II.

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