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| Causes and Prevention of Stress Corrosion Cracking in the Accessory Gearbox Attachment on Central Wing Box′s Third Wall for a Series of Aircraft |
| Received:October 22, 2015 Revised:February 15, 2016 |
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| DOI：10.7643/issn.1672-9242.2016.01.014 |
| KeyWord:accessory gearbox attachment stress corrosion cracking central wing |
| Author | Institution |
| ZHAO Xu |
Dalian Changfeng Industrial Co.，Ltd.，Dalian ，China |
| MAN Chang-hou |
Dalian Changfeng Industrial Co.，Ltd.，Dalian ，China |
| CUI Wen-feng |
Dalian Changfeng Industrial Co.，Ltd.，Dalian ，China |
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| Abstract: |
| Objective To analyze the causes for stress corrosion cracking in the accessory gearbox attachment on central wing box′ s third wall for a series of aircraft and to propose corresponding precautions. Methods Fracture detection on the external casing attachment and analysis of the stress corrosion conditions and corrosive environments were conducted. Results With the combined action of Cl-, stress that exceeded K1SCC and slag inclusions in the forgings, stress corrosion of the 7B04 aluminium alloy occurred under the acidic condition when the surface oxide film broke. Conclusion The techniques and ways of repairing aircrafts should be improved and moderate modifications on the design of the external casing attachment should be conducted. |
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