Effects of crack geometries on reliabilities using probability theories |
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Authors: | Ouk-Sub Lee and Dong-Hyeok Kim |
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Affiliation: | (1) School of Mechanical Engineering, INHA University, 253, Yonghyun-dong, Nam-gu, Incheon, South Korea, 402-751;(2) Department of Mechanical Engineering, INHA University, 253, Yonghyun-dong, Nam-gu, Incheon, South Korea, 402-751 |
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Abstract: | The methodologies to estimate the reliability of cracked structures using the fracture toughness and the SIF are developed.
The probability theories such as the FORM and the SORM are utilized to calculate the failure probability. It is found that
the failure probability increases with the increase of the crack size and the applied stress, and the decrease of the fracture
toughness. It is also found that the failure probabilities obtained by the FORM and the SORM are similar each other for the
through crack,the edge crack, and the single and the double crack emanated from a hole, and turn out different for the elliptical
and semi-elliptical surface cracks. It is noted that the tensile stress affects significantly on the failure probability among
the other random variables on the various crack geometries. |
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Keywords: | Failure Probability Reliability Crack FORM SORM Stress Intensity Factor Sensitivity Index |
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