碳纤维复合材料不同电导率涂层的雷击防护效果测试

Lightning strike test of CFRP coatings with different conductivity

[目的]随着碳纤维增强复合材料(CFRP)在工业领域的广泛应用,其雷击防护性能较差的问题也日益突出。为了验证CFRP不同电导率涂层的雷击防护效果,[方法]基于冲击电流发生装置和雷击损伤效应测试实验台,利用峰值为100 kA的8/20μs双指数脉冲对3种CFRP试件开展对比测试,并分析CFRP材料遭受雷击的致损机理。[结果]实验结果表明,若采用环氧树脂胶等电导率较小的材料防护层,雷电击穿后,CFRP结构将出现较严重损伤,无法实现雷击防护;若采用铜网等电导率较高材料的防护层,则可有效降低雷电流对CFRP结构造成的损伤。[结论]研究成果可为后续CFRP雷击防护研究提供技术支撑。

[Objectives]With the wide application of Carbon Fiber Reinforced Polymer(CFRP)in industry,the problem of poor lightning strike protection has become more and more serious.In order to study the lightning strike protection effect of coatings with different conductivity,[Methods]based on the shock current generation device and the lightning damage effect test bench,a comparative test is carried out on three types of CFRP samples by using 8/20μs double-exponential pulse with the peak value of 100 kA,and the damage mechanism of CFRP subject to lightning strikes is analyzed.[Results]The test results show that,the CFRP structure is more severely damaged after lightning strikes and the lightning strike protection fails to be achieved if a material with low conductivity such as epoxy resin is used as the protective coating;but the damage of the CFRP structure caused by the lightning strikes can be effectively reduced if a material with high conductivity such as copper mesh is used as the protective coating.[Conclusions]The study results can provide technical support for the follow-up CFRP lightning strike protection researches.