碳纤维蜂窝夹层结构防雷击铜网胶膜共固化设计及雷击与承载能力试验

Co-curing Design of Lightning-resistant Copper Mesh Rubber Film and the Lightning Strike/Failure Load Test of Carbon Fiber Honeycomb Sandwich Structure

为有效防止直升机碳纤维蜂窝夹层复合材料蒙皮在雷击环境遭受雷击损伤,采用在蜂窝夹层结构表面铺设铜网胶膜一次固化成形的方法预防。针对直升机不同雷电附着区的七种典型蜂窝夹层结构采用A+B+C+D和D+B+C两种雷电流试验波形进行雷电直接效应试验,并采用面内剪切试验对试验件雷击前/后承载能力和铜网胶膜对承载能力的影响进行试验对比分析。试验证明,在蜂窝夹层结构表面铺设铜网胶膜一次固化成形的方法,能够有效预防雷击损伤,试验件未出现基体大面积烧蚀、分层和片状剥落等现象;承载能力试验中蜂窝夹层结构表现沿载荷加载方向起皱破坏的模式;试验件在雷击前/后承载能力衰减不明显,最大衰减量为4.5%;铜网胶膜有助于提高试验件承载能力,C型试验件相比H型试验件承载能力提高了26.9%;试验件承载能力分散性相对较小,最大分散度为10.4%。

In order to effectively prevent the helicopter carbon fiber honeycomb sandwich skin from lightning strike damage,copper mesh rubber film was laid on the surface of honeycomb sandwich structure.A+B+C+D and D+B+C waveforms were used to lightning strike test,include 7 kinds of typical honeycomb sandwich structures for different lightning attachment zones of helicopter.The shear test was used to compare the failure load of the pieces before and after lightning strike test or the influence of copper mesh rubber film.It is proved that laying copper mesh rubber film on the surface of honeycomb sandwich structure can effectively prevent lightning strike,large-area ablative of matrix,delamination and exfoliation are not found.In the failure load test,the honeycomb sandwich structures are wrinkling damage in the direction of the loading.There are no obvious differences on the attenuation of the failure load,between pieces before and after lightning strike test,the maximum attenuation is 4.5 percent.Copper mesh rubber film is helpful to improve the failure load of pieces,type C increased by 26.9 percent compared with type H.The dispersion of failure load are relatively small,the maximum dispersion is 10.4 percent.