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| Corrosion-Fatigue Life of Aircraft Suspension Materials in Tropical Marine Atmosphere |
| Received:August 13, 2024 Revised:September 06, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2024.12.015 |
| KeyWord:tropical marine atmosphere 40CrNiMoA alloy steel 2A12 aluminum alloy corrosion-fatigue failure mechanism life |
| Author | Institution |
| LI Han |
Southwest Institute of Technology and Engineering, Chongqing , China |
| WEI Xiaoqin |
Southwest Institute of Technology and Engineering, Chongqing , China |
| WANG Qi |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHAO Yang |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHAO Fangchao |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHANG Jinshang |
Southwest Institute of Technology and Engineering, Chongqing , China |
| ZHOU Xuepeng |
Southwest Institute of Technology and Engineering, Chongqing , China |
| LIU Wei |
Southwest Institute of Technology and Engineering, Chongqing , China |
| HUANG Wenming |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The work aims to investigate the life of typical aircraft suspension materials under corrosion-fatigue dynamic environments. Statistical analysis was conducted on service environment factors. An accelerated test environment spectrum was designed by the equivalent corrosion acceleration relationship and the conversion factors for typical metal materials. 40CrNiMoA alloy steel and 2A12 aluminum alloy were placed in a simulated marine atmosphere environment. A self-made atmospheric corrosion-dynamic fatigue environment simulation test device was used to conduct corrosion-fatigue synergistic tests. The S-N curves of the two materials were tested to rapidly assess the corrosion-fatigue life of typical aircraft suspension materials in a tropical marine environment.In a pH=4 acidic salt solution (5% NaCl+0.05% Na2SO4+0.05% CaCl2), after spraying for 4 hours (t=40 ℃) and then drying for 4 hours (t=60 ℃), and repeatedly alternative environment and fatigue tests, the test data of 40CrNiMoA alloy steel and 2A12 aluminum alloy were processed with a linear model. Under the synergistic effect of corrosion and fatigue, the fatigue strength corresponding to 105cycles was 906.2 MPa and 224.6 MPa, respectively, which decreased by two orders of magnitude compared to the strength under pure fatigue. The primary reason was that in the corrosive environment, salt spray corroded the metal surface, forming corrosion pits, which eventually became crack sources and propagated to fracture.When the aircraft suspension structure is used in a tropical marine atmosphere, the fatigue strength significantly decreases due to the synergistic effect of corrosion and fatigue. |
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