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ASTM Selected Technical Papers
Advances in Accelerated Testing and Predictive Methods in Creep, Fatigue, and Environmental Cracking
Editor
Kamran Nikbin
Kamran Nikbin
Symposium Chair and STP Editor
1
Imperial College London
,
London,
GB
Search for other works by this author on:
Zhigang Wei
Zhigang Wei
Symposium Chair and STP Editor
2
University of Michigan
,
Ann Arbor, MI,
US
Search for other works by this author on:
Sreeramesh Kalluri
Sreeramesh Kalluri
Symposium Chair and STP Editor
3HX5, LLC,
NASA Glenn Research Center
,
Cleveland, OH,
US
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ISBN:
978-0-8031-7733-8
No. of Pages:
352
Publisher:
ASTM International
Publication date:
2023

Environmental cracking of high-strength aluminum alloys in corrosive atmospheres presents significant maintenance and safety issues for aircraft and may decrease service life. The service life of an aircraft structure is dependent on the degradation associated with the deposition of corrosive contaminants, the formation of corrosion damage, crack nucleation, and crack propagation. Each of these stages is a time-dependent function of many factors, including environmental severity, material combinations, mechanical loading, and protective properties of coatings. Predictions of aircraft service life may be improved through explicit consideration of corrosive environments in addition to traditional stress and fatigue analysis. This investigation focuses on the influence of cyclic humidity, crevice conditions, and galvanic coupling on the growth of cracks under static load, with the intent to generate relationships between environmental spectra and stress corrosion cracking phenomena for use in aircraft service-life prediction models. Spring-actuated double cantilever beam test systems with continuous displacement monitoring are employed in atmospheric environments to produce estimates of crack length and crack growth rate. Simultaneous zero resistance ammeter measurements of the corrosion currents between galvanically coupled aerospace materials and aluminum double cantilever beam samples provide insight into interactions between the atmospheric environment, electrochemical processes, and crack nucleation and growth. Results demonstrate highest galvanic corrosion rates at high humidity, distinct differences in the effect of wetting and drying processes on crack growth, and peak crevice corrosion and crack growth rates during drying. The atmospheric environmental cracking test system and experimental method may be useful for materials performance testing and model development and validation.

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