| DENG Hong-hua,XIA Qin-xiang,CHENG Xiu-quan,REN Yan-ping.Effects on Anti-corrosion Fatigue Property of Aluminum Alloy after Shot Peening[J],45(1):118-123 |
| Effects on Anti-corrosion Fatigue Property of Aluminum Alloy after Shot Peening |
| Received:September 17, 2015 Revised:January 20, 2016 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2016.01.019 |
| KeyWord:shot peening pre-corrosion aluminum alloy fatigue property aircraft component fracture location |
| Author | Institution |
| DENG Hong-hua |
School of Aircraft Maintenance Engineering, Guangzhou Civil Aviation College, Guangzhou , China |
| XIA Qin-xiang |
School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou , China |
| CHENG Xiu-quan |
School of Aircraft Maintenance Engineering, Guangzhou Civil Aviation College, Guangzhou , China |
| REN Yan-ping |
School of Aircraft Maintenance Engineering, Guangzhou Civil Aviation College, Guangzhou , China |
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| Abstract: |
| Objective To analyze the influence of shot peening on fatigue performance of aluminum alloy components with corrosion damage so as to guide the repair of aircraft components. Methods The 7075 aluminum alloy samples with three types of different surface states, which were treated with un-shot peening, shot peening on three surfaces and shot peening for twice on three surfaces, were selected as the research subjects. The corrosion damage of two different degrees was obtained by changing the corrosion parameters such as NaCl concentration, temperature and time, and the fatigue property of aluminum alloy on shot peening surface state was analyzed according to fatigue life, fracture location and fracture morphology of aluminum alloy. Results At a mild corrosion damage, the fatigue life of shot peening on three surface was 7. 84 times longer than that of un-shot peening, and the fatigue life would be further improved by 1. 62 times if the eroded sample after shot peening was peened again; the fracture position of unshot peening sample was located in the abruptly changed area of cross section, and the fracture position of the other two types of shot peened samples was in the front of clip. According to observation of the fracture morphology, fatigue crack of un-shot peening samples showed that on the edge of the fracture surface, the central regions of shot peened sample formed a smooth and straight stable-extended area. At a serious corrosion damage, shot peening processing still could improve the fatigue life of aluminum alloy, but the fatigue life gap would be reduced on three kinds of different surface samples. According to observation of the fracture position and the fracture morphology, the gap was also narrowed between three kinds of samples. Conclusion The fatigue performance would be improved obviously, if the aluminum alloy corrosion damage components were shot peened before pre-corrosion treatments; and the fatigue performance of materials would be further improved, if the eroded sample after shot peening were peened again; besides, the stress concentration would be weaken on the abruptly changed area of cross-section, and production and growth of fatigue crack would be restrained on the component surface when the aluminum alloy component was shot peened. |
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