SYMPOSIA PAPER Published: 01 January 1997

Corrosion-Fatigue Crack Nucleation in Alclad 2024-T3 Commercial Aircraft Skin


The processes that influence the transition from corrosion pit to crack formation in Alclad 2024-T3 under cyclic loads in aqueous environments were examined in laboratory experiments in salt water. Results suggest that the nucleation of corrosion-fatigue cracks involves two competing mechanisms: hydrogen effects in the cladding and electrochemical dissolution at constituent particles in the core alloy. Cracks in the clad did not necessarily nucleate at the largest corrosion pit, suggesting that a contributing factor to crack nucleation from a pit may be the creation of a local region of weakness. This paper presents results from experiments to assess the effects of pH and cladding on the nucleation and propagation of corrosion-fatigue cracks.

Author Information

Schmidt, CG
SRI International, Menlo Park, CA
Crocker, JE
University of Connecticut, Storrs, CT
Giovanola, JH
SRI International, Menlo Park, CA
Kanazawa, CH
SRI International, Menlo Park, CA
Shockey, DA
SRI International, Menlo Park, CA
Flournoy, TH
FAA Technical Center, Atlantic City, NJ
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Developed by Committee: G01
Pages: 74–88
DOI: 10.1520/STP19954S
ISBN-EB: 978-0-8031-5357-8
ISBN-13: 978-0-8031-2408-0