About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
G-21: Elucidating the Effect of High Altitude Environments on the Fatigue Life of 7075-T651 Aluminum Alloy Determined by Using AFGROW Modeling |
Author(s) |
Luke Brown |
On-Site Speaker (Planned) |
Luke Brown |
Abstract Scope |
Aluminum alloy 7075 is used extensively in aerospace applications which undergo fatigue loading in high atmosphere environments. The fatigue life of these parts is generated from laboratory crack growth rates using linear elastic fracture mechanics software, such as AFGROW. Crack growth rates in high altitude environments (low water vapor, low temperature) have been shown to have significantly slower growth rates when compared to standard laboratory environments. By combining FALSTAFF and ENSTAFF (loading and environment spectra for fighter wings) it is possible to determine the increase in fatigue life when laboratory crack growths are used versus when high atmosphere crack growths are used in AFGROW. While this method does not take into account the transient behavior when changing from one environment to another, a 67% increase in fatigue life was predicted and demonstrates that by implementing these growth rates into current fatigue life models, the inspection burden can be significantly reduced. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |