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| Fracture Failure Analysis and Environmental Adaptability Improvement of Rivet for a Certain Type of Aeronautical Toggle Switch |
| Received:March 11, 2021 Revised:May 10, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.11.013 |
| KeyWord:rivet humidity-heat test ammonia stress corrosion fracture environmental adaptability |
| Author | Institution |
| GAO Jing-jing |
Avic Shanghai Aviation Electric Co., Ltd., Shanghai , China |
| LU Nan |
Air Force Equipment’s NO.3 Military Representative Office in Shanghai, Shanghai , China |
| XIA Xiao-chun |
Air Force Equipment’s NO.3 Military Representative Office in Shanghai, Shanghai , China |
| LIU Ke-gang |
Avic Shanghai Aviation Electric Co., Ltd., Shanghai , China |
| MEI Yu-fei |
Avic Shanghai Aviation Electric Co., Ltd., Shanghai , China |
| ZHANG Xin-jian |
Avic Shanghai Aviation Electric Co., Ltd., Shanghai , China |
| ZHANG Yan |
Avic Shanghai Aviation Electric Co., Ltd., Shanghai , China |
| DU Cui-ling |
Avic Shanghai Aviation Electric Co., Ltd., Shanghai , China |
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| Abstract: |
| This paper aims to solve the fracture failure problem of H62 brass rivet for a certain type of aeronautical toggle switch in humidity-heat test, guarantee the toggle switch’s ability to adapt to natural and induced environment, so as to improve the environmental adaptability and reliability of the whole machine. During the research, we adopt ANSYS Finite Element Analysis,Scanning Electron Microscope Analysis, Spectral Analysis and other methods. Starting from the whole switch system, we perform in-depth analysis of the forced state, material, microstructure and ions precipitated from the housing of the fractured rivet, ascertain the failure reason and mechanism of the rivet, and propose countermeasures from parts to product level. The fracture of rivet is a typical cleavage fracture, and the fracture is covered with a great amount of corrosion product, and the release of NH4+ from the switch housing leads to stress corrosion fracture of rivet. Conclusion could be drawn that the fracture failure of brass rivet is due to the release of ammonia gas from lower switch housing induced by the damp and hot environment, and the ammonia gas immerses into the rivet subjected to tensile stress for a long time, resulting in stress corrosion. Therefore the environmental adaptability of rivet in toggle switch system is supposed to be preferentially evaluated during scientific research and trial production. |
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