Investigation of cold expansion of short edge margin holes with preexisting cracks in 2024-T351 aluminum alloy

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Title Investigation of cold expansion of short edge margin holes with preexisting cracks in 2024-T351 aluminum alloy
Publication Type thesis
School or College College of Engineering
Department Mechanical Engineering
Author Andrew, Dallen Lee
Date 2011-12
Description When a crack indication is found at a hole, current United States Air Force (USAF) technical data require that the hole must be oversized to a larger diameter to remove the damage. Unnecessarily oversizing a hole is undesirable from a fatigue point of view. This research has the potential benefit of not requiring the hole to be oversized and potentially could reduce the number of inspections required for aircraft. The experiments performed in this research investigated the fatigue crack growth lives of short edge margin holes. Three configurations were used â€" a baseline condition consisting of non-cold-expanded holes, another baseline condition of holes that were cold-expanded, and the test condition of holes containing a crack when cold-expanded. All configurations were loaded under constant and variable-amplitude loading. The hypothesis is that the cold expansion of a hole with a preexisting crack will provide a significant increase in fatigue life compared to an identical hole that was not cold-expanded. Additionally, the USAF analytical approach used to account for the fatigue life benefit due to cold expansion is compared to the experiment data, and may not be providing conservative predictions for the specific geometry and loading used in this experiment.
Type Text
Publisher University of Utah
Subject AFGROW; Cold expansion; Cold work; Fatigue; Fracture; Precrack
Dissertation Institution University of Utah
Dissertation Name Master of Science
Language eng
Rights Management Copyright © Dallen Lee Andrew 2011
Format application/pdf
Format Medium application/pdf
Format Extent 5,340,573 bytes
Identifier us-etd3,71147
Source Original in Marriott Library Special Collections, TL8.5 2011 .A63
ARK ark:/87278/s6rj507w
Setname ir_etd
ID 194623
Reference URL https://collections.lib.utah.edu/ark:/87278/s6rj507w
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