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为了研究碳纤维增强复合材料(CFRP)在雷电流作用下的损伤规律,对CFRP进行了雷电流直接效应实验和电-热耦合效应仿真。首先,利用冲击电流发生装置进行了雷电流的直接效应实验,对比了不同电流峰值情况下CFRP的表面损伤情况,并通过C扫描观察了内部损伤。实验结果表明:CFRP的损伤范围随电流峰值增大而显著增大,且内部损伤的范围远大于表面损伤的范围。之后,对试件进行了电-热耦合有限元分析,并利用叠加的温度场范围近似表示内部损伤的范围,与实验结果的对比说明了此方法的有效性。不同类型及不同作用积分的冲击电流作用下的电-热耦合分析结果表明,作用积分是影响损伤范围的重要因素。
In order to study the damage rules of CFRP under the action of lightning current, the direct current effects of lightning current and the simulation of electro-thermal coupling effect on CFRP were studied. First of all, the direct effect experiment of lightning current was carried out by using the impulse current generator. The surface damage of CFRP under different current peaks was compared. The internal damage was observed by C-scan. The experimental results show that the damage range of CFRP increases significantly with the increase of current peak, and the range of internal damage is much larger than the range of surface damage. Afterwards, the electrothermal-thermal coupling finite element analysis of the specimen was carried out, and the range of internal damage was approximated by the temperature field of the superposition. The comparison with the experimental results shows the effectiveness of this method. The results of electrothermal-thermal coupling under the impact current of different types and different integration points show that the integral of action is an important factor affecting the damage range.