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Surface Morphology and Resistance Change of Carbon Fiber Aeronautical Composites after Lightning Current Component A |
Wang Jianguo1, Shan Fei1,2, Zhou Mi1, Fan Yadong1, Cai Li1 |
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China; 2. State Grid Chengdu Electric Power Corporation Chengdu 610000 China |
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Abstract Carbon fiber resin matrix composites are widely used in aircraft manufacturing, which need necessary lightning protection. In this paper, the direct lightning effect tests of carbon fiber composite materials of four kinds of surface protection styles including full aluminum spraying, grid aluminum spraying, copper mesh full spraying and grid copper mesh, as well as carbon fiber composite material without surface protection, were conducted with lightning current component A. The surface resistance measurement of the four kinds of surface protection layers were carried out before and after the lightning test. The test results show that the surface resistance of carbon fiber composites with four kinds of protection layers are 20mΩ to 40mΩ before the lightning test, and they will reach to 4.7, 4.4, 0.9 and 1.5 times than that of before for full aluminum spraying, copper mesh full spraying, grid aluminum spraying and grid copper mesh. The surface morphology after the lightning test show the CFRP without protection is seriously damaged, which is manifested as fiber fracture and resin vaporization. In addition,the four kinds of protective layers have good lightning protection ability, and the performance of grid copper mesh is worse than that of full protection, where the protective layer contacts the lower fiber showing the fiber is slightly damaged.
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Received: 20 November 2019
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