碳纤维增强树脂复合材料在多重连续雷电流冲击下的损伤特性

通过对比碳纤维增强树脂复合材料（CF/EP）层合板在单一雷电流脉冲及不同组合及时序的多重雷电流分量作用下的雷击损伤特性，探索多重连续雷电流分量在CF/EP层合板上的散流过程与作用机制。研究发现CF/EP层合板在雷电流脉冲作用下出现纤维断裂、烧蚀、树脂热解、铺层分离等严重雷击损伤。在雷电流A、B、C及D分量连续作用下，CF/EP损伤面积达到2 790 mm2，损伤深度约1.28 mm。在多重连续雷电流脉冲作用下，CF/EP的雷电损伤深度主要与雷电流A、B及D分量的冲击力效应及介质击穿效应有关，而持续时间长、转移电荷量大的雷电流C分量的热效应对损伤面积的贡献接近40%。CF/EP层合板雷击损伤特性与雷电流分量的组合及作用时序关系密切，雷电流分量单独作用时造成的CF/EP雷击损伤效果与处于多重连续脉冲序列中时所造成的雷击损伤效果有很大差异。对CF/EP在多重连续雷电流作用下损伤效应的研究能够加深对雷电作用过程的理解，并为CF/EP雷电直接效应机制研究及试验方法的建立及完善提供实验和理论依据。 

Damage properties of carbon fiber reinforced epoxy composite subjected to multiple continuous lightning current strikes

The lightning damage properties of carbon fiber reinforced polymer (CF/EP) laminates subjected to the single lightning impulse and multiple lightning component strikes with different combinations were experimentally evaluated to explore the flowing process and interaction mechanism of multiple continuous lightning components on CF/EP laminates. The experimental results indicate that CF/EP laminates suffer serious lightning damage, including fractures and erosion of carbon fibers, resin pyrolysis and layer delamination. The damage area and depth are approximately 2 790 mm2 and 1.28 mm in the "ABCD" test mode. In the multiple continuous lightning current test, the lightning damage depth of CF/EP is closely related to the impact force effect and the breakdown effect of lightning components A, B and D. The thermal effect of the lightning component C with long-duration and large amount of transferred charge contributes nearly 40% to the damage area. The combination and application sequence of multiple lightning components are important factors for evaluating the lightning damage of CF/EP laminates. The lightning damage effect of the single lightning impulse differs greatly from the lightning damage when the lightning component is a part of the multiple continuous lightning component sequence. The study on the damage effect of CF/EP under the multiple continuous lightning components can deepen the understanding of the lightning interaction process and provide experimental and theoretical basis for studying the mechanism of the lightning effect and the establishment of lightning test methods.