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| Experimental Research on Equivalent Accelerated Relationship of 2024-T3 Aluminium Alloy Based on DFR |
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| DOI：10.7643/issn.1672-9242.2023.02.008 |
| KeyWord:DFR 2024-T3 aluminum alloy natural exposure in marine atmospheric environment equivalent accelerated relationship corrosion fatigue |
| Author | Institution |
| WANG Ji-pu |
The First Aircraft Design and Research Institute of AVIC, Xi'an , China |
| YANG Wei-ping |
The First Aircraft Design and Research Institute of AVIC, Xi'an , China |
| CHEN Yue-liang |
Qingdao Campus of Naval Aviation University, Shandong Qingdao , China |
| ZHANG Yan-jun |
The First Aircraft Design and Research Institute of AVIC, Xi'an , China |
| SHI Zhi-jun |
The First Aircraft Design and Research Institute of AVIC, Xi'an , China |
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| Abstract: |
| The work aims to take DFR that reflects the fatigue performance of structural materials as a characterization parameter to study and establish the DFR relationship of 2024-T3 aluminum alloy structure after pre-corrosion in natural environment and accelerated laboratory test, so as to provide a method for fatigue life design of aircraft aluminum alloy structure in corrosive environment. With 2024-T3 aluminum alloy test piece as the research object, the DFR test after natural exposure corrosion in typical marine atmospheric environment and accelerated corrosion in laboratory was carried out respectively. On the condition that DFR was equal, the DFR equivalent accelerated relationship between the above two different pre-corrosion conditions was established. After natural explosion in pre-corrosion environment and accelerated pre-corrosion in laboratory, the DFR of 2024-T3 aluminum alloy decreased to different degrees with the increase of corrosion time, and the DFR equivalent accelerated values in Wanning and Qingdao were 0.642 1 a/d, and 0.702 1 a/d, respectively. The equivalent accelerated relationship based on DFR comprehensively reflects the effect of pre-corrosion on the fatigue performance degradation of structural materials. DFR is the basic parameter for the fatigue design of aircraft structure, and the equivalent accelerated relationship established can be used to guide the fatigue life design and analysis of aluminum alloy in corrosive environment. |
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