不同喷铝参数对复合材料雷击防护性能模拟

为了研究复合材料不同的雷击防护(lightning strike protection,LSP)系统在雷电流作用下的损伤规律,对雷击损伤过程和烧蚀机理进行分析,建立复合材料层合板雷击防护的能量平衡数学模型。在此基础上,在ABAQUS中建立复合材料基准件、全喷铝和局部喷铝防护系统的碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)层合板电-热耦合有限元模型,和实验结果对比验证模型的有效性,对雷击烧蚀损伤特征进行分析,并引入雷击烧蚀损伤指数DI,得出三种不同模型在不同铝涂层厚度、不同峰值雷电流作用下的烧蚀损伤规律,并对两种不同的局部喷铝防护系统下复合材料的损伤特征进行对比分析。结果表明:雷击防护系统下复合材料的烧蚀损伤面积和铝涂层厚度关系进行函数拟合,两者均满足幂函数关系。

Simulation of lightning protection performance of composite materials with different aluminum spraying parameters

In order to study the damage law of composite material full and partial aluminum spraying protection system lightning strike protection caused by lightning current, the lightning damage process and ablation mechanism were analyzed, the energy balance mathematical model of composite laminated plate lightning protection was established. On this basis, a thermal-electrical coupling analysis finite element model of carbon fiber reinforcement plastic(CFRP) with the composite material reference specimen,full-scale spraying aluminum and partial spraying aluminum protection system subjected to lightning current had been established based on ABAQUS, and lightning strike ablation damage was analyzed. The experimental results verified the validity of the simulation, and the lightning ablation damage index DI was introduced.The ablation damage law of three different models under different aluminum coating thickness and different peak lightning current was obtained, and the damage characteristics of composites under two different local aluminum spray protection systems were compared and analyzed. The results show that the relation between the ablative damage area of composite material and the thickness of aluminum coating in the lighting protection system is functionally fitted, both of which satisfy the functional relation of power function.