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| Effects of Salt-fog Environment on Fatigue Limit of High Strength Bolt for Military Airplane |
| Received:July 27, 2016 Revised:March 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.03.011 |
| KeyWord:high strength bolt salt-fog fatigue limit S-N curve fracture morphology |
| Author | Institution |
| YANG Yi |
Southwest Research Institute of Technology and Engineering, Chongqing , China |
| ZHAO Jun-jun |
Chongqing Jialing Special Equipment Co. Ltd, Chongqing , China |
| YANG Xiao-kui |
Southwest Research Institute of Technology and Engineering, Chongqing , China |
| WANG Hui |
Southwest Research Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| Objective To research the change of fatigue limit of high strength bolt for military airplane exposed to simulated marine atmosphere environment (salt-fog environment). Methods The high strength bolt was proceed with pre-corrosion test by 360 hours of neutral salt-fog test followed by 96 hours of CASS test. The fatigue test was performed after the corrosion test. The corroded sample was compared with the uncorroded by virtue of the S-N curve and fracture morphologies. Results The bolt was corroded after salt-fog test and the fatigue limit of high strength bolt decreased by 28.4%. Conclusion High strength bolt for military airplane is likely to be corroded in the simulated marine atmosphere environment and its fatigue limit decreases evidently. Its main reason is the reduction of effective fatigue test area due to serious corrosion. |
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