Affiliation:
1. Sino‐European Institute of Aviation Engineering Civil Aviation University of China Tianjin China
2. College of Mechanical Engineering Yangzhou University Yangzhou China
3. School of Engineering, College of Science and Engineering University of Galway Galway Ireland
4. Ryan Institute University of Galway Galway Ireland
5. I‐Form Advanced Manufacturing Research Centre Dublin Ireland
Abstract
AbstractThis paper presents characterization for fatigue failure analysis of precorroded AA7075‐T651 under air and exfoliation corrosion (EXCO) environments, with respect to damage accumulation, macrocrack and microcrack behavior via 3D digital image correlation (DIC), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD). It is shown that that corrosion pits induce fatigue cracking with different nucleation times, and locations. It is furthermore shown that while the corrosive environment accelerates crack formation, it significantly hinders fatigue crack propagation at low stress amplitudes due to crack closure and tip passivation. Five dominant fatigue microcrack initiation types (pit bottom, corrosion tunnel, corrosion micropit, corrosion jut‐in, and chapped feature) and relevant mechanisms were identified, related to corrosion pit macro–micro morphology, material microdefect, local material grain structure, and loading condition.
Funder
Fundamental Research Funds for the Central Universities
National Natural Science Foundation of China
Science Foundation Ireland
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
1 articles.
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