| Publication Type |
thesis |
| School or College |
College of Engineering |
| Department |
Mechanical Engineering |
| Author |
Carlson, Scott Spencer |
| Title |
Experimentally derived beta corrections to predict fatigue crack growth at cold expanded holes in 7075-T651 aluminum alloy |
| Date |
2008-08 |
| Description |
Fastener holes represent one of the most common fatigue details found in airframe structures. In order to minimize the impact fastener holes have on the fatigue behavior of critical aircraft components, many are processed by cold expansion. Cold expansion imposes a residual compressive stress field around a hole that retards fatigue crack growth from the volume of cold working and increases the fatigue life of the component. According to the current United States Air Force's guiding documents state that a damage tolerance analysis can take advantage of cold expansion by reducing the initial flaw size to a minimum of a 0.005 inch corner crack. A more physically based approach was investigated to take analytical advantage of the cold expansion process. The author explored, through experimental fatigue testing, the development of an empirical correction factor j8 for the effects of cold expansion in 2024-T351 aluminum alloy. This method takes into account the interaction of the fatigue crack and the residual stress field found in the body. Many common current methods are unable to account for this critical interaction. The (3 correction factor can be used in fatigue crack growth and damage tolerance analysis and can be shown to provide a more accurate model of the crack growth behavior at cold expanded holes. |
| Type |
Text |
| Publisher |
University of Utah |
| Subject |
Aluminum alloys; Airframes; Fatigue |
| Dissertation Institution |
University of Utah |
| Dissertation Name |
MS |
| Language |
eng |
| Relation is Version of |
Digital reproduction of "Experimentally derived beta corrections to predict fatigue crack growth at cold expanded holes in 7075-T651 aluminum alloy" J. Willard Marriott Library Special Collections, TA7.5 2008 .P54 |
| Rights Management |
© Scott Spencer Carlson |
| Format Medium |
application/pdf |
| Format Extent |
130,234 bytes |
| Identifier |
us-etd2,33250 |
| Source |
Original: University of Utah J. Willard Marriott Library Special Collections |
| ARK |
ark:/87278/s66404bw |
| Setname |
ir_etd |
| ID |
193344 |
| Reference URL |
https://collections.lib.utah.edu/ark:/87278/s66404bw |
