对轻质飞机结构的需求已经从传统金属如铝转变为复合材料如碳纤维增强聚合物(CFRP)以实现重量减轻。然而,由于CFRP的介电性质,这种转变导致雷击保护效率降低。为了解决这个问题,对两个CFRP样品(一个未保护,另一个用碳纳米管(CNT)片材屏蔽)进行人工雷击测试。该研究采用热-电耦合有限元分析方法来研究雷击对两个样品的影响和损伤机理。数值结果与公布的实验数据密切相关,验证模拟。无保护的CFRP在厚度方向上受到损坏,最多可达到8个复合层片,在110mm的长度范围内受到平面内方向的损坏。相比之下,用CNT片材保护的样品表现出仅限于前4层表面的损伤,平面内损伤减少到24毫米。值得注意的是,与未保护的CFRP样品相比,用CNT片材保护的CFRP中的损伤面积显示出显著的78.1%的减少。这表明当在平面内和厚度方向上的中间层之间结合时,CNT可以增强CFRP的导电性。该研究增强了对雷击条件下CFRP损伤行为和失效模式的理解,强调CNT片材作为航空航天应用的改进和可行的雷击保护系统,保证进一步调查。
The demand for lightweight aircraft structures has shifted from traditional metals like aluminum to composite materials such as carbon fiber reinforced polymers (
CFRP) to achieve weight reduction. However, this transition has led to decreased lightning strike protection efficiency due to the dielectric nature of
CFRP. To address this problem, two
CFRP samples-one unprotected and the other shielded with carbon nanotube (CNT) sheets-were subjected to artificial lightning strike testing. The research employed a coupled thermal-electrical finite element analysis method to investigate the lightning strike\'s impact and damage mechanisms on both samples. The numerical results closely aligned with published experimental data, validating the simulation. Unprotected
CFRP sustained damage through the thickness direction up to 8 composite plies and in-plane direction over a length of 110 mm. In contrast, the sample protected with CNT sheets exhibited damage limited to the surface of the first 4 plies, with in-plane damage reduced to 24 mm. Notably, the damage area in the CFRP protected with CNT sheets showed a substantial 78.1 % reduction compared to the unprotected
CFRP sample. This suggests that CNT can enhance the electrical conductivity of CFRP when incorporated between interlayers in both in-plane and thickness directions. The study enhances understanding of CFRP damage behavior and failure modes under lightning strike conditions, emphasizing CNT sheets as an improved and viable lightning strike protection system for aerospace applications, warranting further investigation.