Abstract
A unique method for producing either single or double fatigue cracks embedded in fastener hole walls is described. The method repeatedly produces small semielliptical fatigue cracks and is valuable for basic experimental evaluations dealing with crack growth from fastener holes. Test specimens were prepared from 7075-T651 aluminum alloy plate for collecting constant amplitude embedded crack growth data for open and filled hoies without load transfer. Fractographic data are presented to show crack front shape and growth rates. Crack shape data correlated well with similar data derived from naturally induced embedded cracks. Analytical predictions were made for the same cases evaluated experimentally. Good correlations between the analytical and experimental results were obtained.
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