Stress intensity factors for surface cracks at countersunk holes |
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Authors: | Chul Young Park Alten F. Grandt Jr. |
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Affiliation: | a Eclipse Aviation Corporation, 2503 Clark Carr Loop SE, Albuquerque, NM 87106, United States b Professor and Graduate Student, School of Aeronautics and Astronautics, Purdue University 315 N. Grant St., West Lafayette, IN 47907, United States |
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Abstract: | Fatigue crack growth from countersunk fastener holes loaded in remote tensile loading was studied using the transparent polymer PMMA. A single edge corner crack at the bottom of the plate and a single internal surface crack at the sharp intersection between the bore and the countersink were induced in the PMMA specimens by pre-cracking. The specimens were then fatigue tested under constant amplitude remote tensile loading and the ‘back-calculation’ method was used to determine stress intensity factors at several crack front locations. When variations in fatigue crack closure were taken into account, the experimental stress intensity factors agreed well with the computational results at selected crack fronts. |
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Keywords: | Stress intensity factor Countersunk hole Crack closure PMMA |
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