Abstract
Fatigue crack propagation behavior in typical corrosion environments is the precondition of damage tolerance design for metallic structures in aircraft; therefore, in order to determine corrosion fatigue crack propagation behavior, fatigue tests were performed on three categories of aluminum alloys (i.e., 2E12-T3, 2E12-T42 and 7050-T7451) in two kinds of corrosion environments (3.5wt% NaCl solution and fuel tank ponding) under constant amplitude loading. Corrosion fatigue crack propagation properties in different corrosion environments were analyzed and compared with each other, and the interaction mechanisms between corrosion and fatigue were deduced from fractographic studies by using SEM analysis. It is showed that the effect of fuel tank ponding on fatigue crack propagation behavior is more significant than that of 3.5wt% NaCl solution, and aluminum alloys 2E12-T3 and 2E12-T42 hold superiority over aluminum alloy 7050-T7451 in corrosion fatigue crack propagation behavior. Corrosion crack propagation is enhanced due to the hydrogen embrittlement effect and anodic dissolution mechanism.
| Original language | English |
|---|---|
| Pages (from-to) | 935-941 |
| Number of pages | 7 |
| Journal | Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics |
| Volume | 43 |
| Issue number | 5 |
| DOIs | |
| State | Published - May 2017 |
Keywords
- Aluminum alloy
- Corrosion
- Crack propagation
- Fatigue
- SEM
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