Cracked Brazilian disc specimen subjected to mode II deformation |
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Authors: | MR Ayatollahi MRM Aliha |
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Affiliation: | Fatigue and Fracture Laboratory, Department of Mechanical Engineering, Iran University of Science and Technology, Narmak, 16844, Tehran, Iran |
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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 (KIIc/KIc) is always significantly higher than the theoretical predictions. It is shown in this paper that the increase in the ratio KIIc/KIc 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 KIIc/KIc 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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Keywords: | Brazilian disc specimen Brittle fracture Mode II Stress intensity factor T-stress |
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