Cracked Brazilian disc specimen subjected to mode II deformation

Abstract The centrally cracked Brazilian disc specimen has been used by many researchers to study mode I and mode II brittle fracture in different materials. However, the experimental results obtained in the past from this specimen indicate that the fracture toughness ratio ( K IIc / K Ic ) is always significantly higher than the theoretical predictions. It is shown in this paper that the increase in the ratio K IIc / K Ic can be predicted if a modified maximum tangential stress (MTS) criterion is used. The modified criterion takes into account the effect of T -stress in addition to the conventional singular stresses. The fracture toughness ratio K IIc / K Ic is calculated for two brittle materials using the modified criterion and is compared with the relevant published experimental results obtained from fracture tests on the cracked Brazilian disc specimen. A very good agreement is shown to exist between the theoretical predictions and the experimental results.

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