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| Application of Shot Peening Technology on Lifetime Extension Repair of an Actuator Cylinder |
| Received:July 21, 2018 Revised:December 25, 2018 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2018.12.016 |
| KeyWord:actuator cylinder shot peening technology fatigue life test lifetime extension fatigue resistance |
| Author | Institution |
| ZHAO Xi-yang |
Dalian Changfeng Industrial Corporation, Dalian , China |
| CHEN Xiao-xiu |
Dalian Changfeng Industrial Corporation, Dalian , China |
| MENG Hai-ying |
Dalian Changfeng Industrial Corporation, Dalian , China |
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| Abstract: |
| Objective To extend the lifespan of an actuator cylinder of an aircraft landing gear from 6000±150 times to 12000 + 150 times. Methods Shot peening technology was adopted to improve the fatigue resistance and stress corrosion resistance of the main bearing parts of the actuator barrel. The life expectancy of typical parts and actuators before and after shot peening treatment was verified through fatigue life test. Results Through the fatigue life test, it was proved that the test cycle times of 3 front earring bolts were not more than 1.8 ?106 before breaking. While there was no breaking when the test cycle times of 3 front ring bolts after shot peening reached 3.6 ? 106. Compared with the fatigue life test results of 4 main earring bolts and 4 main earring bolts before shot peening, the test cycle times of the fracture were improved in varying degrees; the mean life ratio was greater than 2.36. There was no crack or damage when the fatigue life test of the main front actuating cylinder before and after the shot peening treatment reached the expected cycle times. Conclusion Shot peening treatment can obviously improve the fatigue resistance and stress corrosion resistance of the actuator. The fatigue life of the parts after strengthening can exceed 2 times the fatigue life of the parts before the reinforcement treatment. The shot peening technology can be used to prolong the service life of the working cylinder. |
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