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| Damage on Aluminum Alloy-Nitrile Rubber Aeronautic Clamp with Cushion in Typical Environments |
| Received:December 27, 2016 Revised:June 15, 2017 |
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| DOI：10.7643/ issn.1672-9242.2017.06.013 |
| KeyWord:clamp with cushion nitrile rubber damp heat solar radiation retention force |
| Author | Institution |
| LI Gang |
Aviation Industry Corporation of China, Beijing , China |
| LI Ming |
Aviation Industry Corporation of China, Beijing , China |
| YANG Xiao-kui |
Southwest Technology and Engineering Research Institute, Chongqing , China |
| XIANG Jiang-tao |
Southwest Technology and Engineering Research Institute, Chongqing , China |
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| Abstract: |
| Objective To study damage effect of typical environments on aluminum alloy-nitrile rubberaeronautic clamp with cushion. Methods According to the GJB 150A—2009 standard, the damp heat aging experiments and solar radiation aging experiments of aluminum alloy – nitrile rubber aeronautic clamp with cushion were carried out with the simulation of its assemble structure and stress state. The performance degradation process of the clamp was analyzed with macroscopic topography, clamp retention force test and tensile property test of rubber cushion, combined with the technologies of SEM and FTIR. Results After 50 days of aging in the damp heat and solar radiation environment, many microporous defects appeared on the surface of the rubber cushion, and the tensile properties were greatly reduced. The retention force of clamp decreased 35% and 51% respectively. Conclusion The inner structure of the rubber cushion of simulated assembly state in damp heat and solar radiation environment is gradually loosened, and some carbon-carbon double bonds are oxidized and cross-linked, and to a certain extent, the intercalation reaction of the rubber gaskets is improved. The crosslinking density of the polymer increases, the hardness of the material increases, the rebound resilience decreases, and the packing capacity of the rubber liner against the mandrel decreases, resulting in a decrease in the reten-tion performance of the clamp. |
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