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Rock Mechanics and Rock Engineering · 2022 · Vol. 55 · Issue 11 · Springer
In this study, mode I fracture tests on cracked straight-through Brazilian disc (CSTBD) and notched semi-circular bend (NSCB) shale specimens with different sizes were conducted to investigate the difference between maximum tangential stress fracture criterion and the size effect law (SEL) model in predicting apparent fracture toughness ( K a ) of shale. In addition, the effects of specimen size and geometry on the K a and the...