雷电C分量对碳纤维增强复合材料的热损伤研究

Research of Thermal Damage of Carbon Fiber Reinforced Polymer under Lightning Current C Component

为了辨析雷电C分量对碳纤维增强聚合物复合材料(Carbon Fiber Reinforced Polymer,CFRP)的热损伤机制,首先对雷电流作用下造成碳纤维增强复合材料热损伤的热源进行理论分析,然后基于多物理场仿真软件建立含热流密度的电-热耦合仿真模型,并对CFRP进行标准化人工模拟雷击试验。对比CFRP内部电势和温度变化趋势,认为电弧热效应是雷电C分量作用期间导致复合材料升温的主要原因。电荷量的增加会加剧复合材料面内损伤程度,扩大深度损伤范围,但损伤模式不变。以损伤面积作为评价指标,对比仿真与试验超声C扫描的结果,吻合度良好,验证了所建立模型的准确性。

In order to identify the thermal damage mechanism of lightning current C component on carbon fiber reinforced polymer(CFRP),the heat source of carbon fiber reinforced polymer thermal damage caused by lightning current is first analyzed,and then an electro-thermal coupling simulation model containing heat flux density is established based on COMSOL software,and a standardized artificial simulated lightning strike test is carried out on CFRP.Through the comparative analysis of the internal potential and temperature variation trend of CFRP,it is concluded that the arc thermal effect is the main reason for the heating of the composite during the action of lightning current C component.The increase of charge will aggravate the degree of in-plane damage of the composite and expand the depth damage range,but the damage mode remains unchanged.Taking the damage area as the evaluation index,the results of the simulation and the test ultrasonic C-sweep are compared,and the consistency is good,which can be used for the evaluation of lightning damage of composite structures.