含紧固件碳纤维复合材料雷击损伤电热耦合仿真分析与实验研究

Electrothermal coupled analysis and experimental research of lightning damage of carbon fiber composites with fastener

为研究含紧固件碳纤维复合材料(CFRP)雷击损伤特性,分别建立含紧固件CFRP和不含紧固件CFRP的三维有限元模型,利用电热耦合仿真分析CFRP的雷击损伤形态,并对应进行雷电流损伤实验,对比研究不同雷电流峰值下两种CFRP的损伤特性。结果表明:雷电流峰值较低时,含紧固件CFRP的表面损伤程度低于不含紧固件的CFRP,随着雷电流峰值增大,含紧固件CFRP沿碳纤维纵向损伤逐渐加大,并最终超过不含紧固件CFRP。实验中不含紧固件CFRP受到雷击时表面垂直碳纤维方向上出现线状损伤,含紧固件的CFRP垂直碳纤维方向的线状损伤不明显。

In order to study the lightning damage characteristics of CFRP with fastener,this paper established a three-dimensional finite element model of CFRP with fastener and CFRP without fastener,and analyzed the lightning damage morphology of CFRP through electrothermal coupling simulation by finite element software.The lightning current damage test was carried out and the damage characteristics of the two kinds of CFRP under different lightning current peaks were compared.The results show that when the peak value of lightning current is low,the surface damage degree of CFRP with fastener is lower than that of CFRP without fastener.As the peak value of the lightning current increases,the longitudinal damage of the CFRP with fasteners gradually increases along the carbon fiber,and eventually exceeds the CFRP without fasteners.In the experimental,when CFRP without fastener is struck by lightning,linear damage is appeared on the surface perpendicular to the direction of carbon fiber,but the linear damage of CFRP with fastener perpendicular to the direction of carbon fiber is not obvious.