复合材料雷击防护电热耦合模型

Electrothermal coupling model for lightning strike protection of composite materials

为了研究复合材料雷击防护(lightning strike protection,LSP)系统在雷电流作用下的损伤规律,基于雷击过程中的能量守恒关系,建立复合材料层合板雷击防护的电-热耦合数学模型。在此基础上,在ABAQUS中建立铝涂层防护的碳纤维增强复合材料(carbon fiber reinforced polymer,CFRP)层合板雷击烧蚀损伤有限元模型,并对雷击烧蚀损伤进行分析,和实验结果对比验证仿真的有效性,得出复合材料层合板在不同峰值雷电流、不同组合波形和不同铝涂层厚度雷电流作用下的烧蚀损伤规律。结果表明:铝涂层厚度相同时,峰值电流从50kA 增大到100kA时,复合材料层合板损伤面积约增大 1.5 倍;10/350波形50 kA峰值雷电流作用下,基准件的损伤面积约为0.05 mm厚度铝涂层防护系统下复合材料损伤面积的4倍。

In order to study the damage law of the composites lightning strike protection caused by lightning current, the electrothermal coupled mathematical model of the ablation damage of composite laminates protected was constructed based on the principle of energy balance. According to the model, a thermal-electrical coupling analysis finite element model of carbon fiber reinforcement plastic(CFRP)with protection subjected to lightning current was established based on ABAQUS, the lightning strike ablation damage was analyzed, and compared with the experimental results to verify the validity of the simulation. Thus, the ablation damage mechanism of composite laminates under different peak currents, different combination waveforms and different aluminum coating thicknesses is obtained. The results show that when the peak current increased from 50 kA to 100 kA with the same thickness of aluminum coating, the damage area of composite laminates increased by about 1.5 times. Under the action of lightning current waveform of 10/350 with peak value of 50 kA, the damage area of the composite reference is about 4 times of that the composite materials under the protection system of aluminum coating with thickness of 0.05 mm.