About this Abstract |
Meeting |
MS&T25: Materials Science & Technology
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Symposium
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Understanding Corrosion-Related Cracking
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Presentation Title |
Understanding the ability of combined effects corrosion fatigue accelerated testing to properly reflect in-service performance for aerospace Al alloys |
Author(s) |
Jenifer S. Locke, Olivia Underhill, Brandon Free, Daniel Egbuzie, Jason Niebuhr, Sarah Galyon Dorman, Christopher Taylor |
On-Site Speaker (Planned) |
Jenifer S. Locke |
Abstract Scope |
This work is part of a larger collaborative effort aimed at advancing life prediction models by utilizing machine learning and a Bayesian network cumulative probability approach. The research discussed here will focus on corrosion fatigue (CF) testing of Al-Mg-Cu-Zn alloys under atmospheric environments controlling surface salt deposits, relative humidity, and temperature aimed at understanding how conventional full immersion testing may not accurately predict service CF damage accumulation. Testing on AA7085-T7451 with only NaCl deposited on the surface has shown the acceleration in fatigue crack growth rate from the environment persists to higher fatigue loading frequencies than predicted by testing under full immersion. Tests are on-going examining AA7075-T6 and complex sea salt that more closely approximate near seacoast atmospheric conditions. Current experimental progress and how data and outdoor testing a will be utilized to understand the most critical environmental parameters and be utilized in modelling efforts will be discussed. |