Quarter-Elliptical Cracks Emanating from Holes in Plates.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO
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A 1971 analysis of United States Air Force aircraft structural failures showed that over one third of all failures originated from cracks emanating from fastener holes. Some of the cracks are caused by the manufacturing processes and since holes act as stress raisers, other cracks form under the influence of fatigue. If the cracks are cyclically loaded, they will grow through fatigue until they are detected, or until a catastrophic failure occurs. Crack growth under fatigue loading can be related to the stress intensity factor. So far, only one solution for a three dimensional crack emanating from a fastener hole has been obtained, leaving a multitude of important radial crack problems to be solved. This dissertation presents solutions for the stress intensity factor for the case of flat, quarter-elliptical, corner cracks emanating from a circular hole in a finite thickness plate.
- Metallurgy and Metallography