About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
The Effect of Molecular Transport on the Environmentally Assisted Fatigue Crack Growth Behavior of Aerospace Al-alloys in High Altitude Environments |
Author(s) |
James Burns, Adam Thompson, Luke Brown |
On-Site Speaker (Planned) |
James Burns |
Abstract Scope |
High altitude environments are typified by low temperatures and low water vapor pressures, which reduce the crack growth rates (da/dN) observed in aerospace aluminum alloys by orders of magnitude. Incorporation of such behavior into linear elastic fracture mechanics (LEFM) modeling can result in a decreased inspection burden, increased airframe availability, and increased prediction accuracy. Such modeling approaches require a testing methodology that will rigorously generate environment specific crack growth kinetics that will ensure similitude between laboratory generated data and the behavior of engineering components. Despite a constant bulk environment and ΔK similitude can be compromised by variations in the molecular transport path. This study will provide clear evidence of this transport mediated behavior, present computational flow models that capture the microchannel flow at the relevant high Knudsen numbers, and will explore testing protocol recommendations to enable generation of data that can be rigorous used in engineering scale predictions. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |