摘要
碳纤维增强聚合物(CFRP)复合材料应用广泛,但与金属及合金相比电导率较低,遭遇雷击时易发生损毁。该文通过雷击损伤形貌观察、C扫描探伤、压缩强度测试及电-热耦合仿真等方式,对比了雷电流A分量和C分量单独作用下CFRP层合板的散流特性及损伤特性。研究发现,在A分量作用下CFRP层合板表面铺层产生长约120mm、宽约30mm,与铺层方向一致呈45°的纤维炸裂带;在C分量作用下CFRP层合板产生直径约60mm的圆形烧蚀坑。与未损伤件相比,A分量作用后层合板弹性模量基本不变,C分量作用后层合板弹性模量减小,两种电流分量作用后层合板最大压缩强度均略微增大。电-热耦合计算结果表明,A分量作用过程中CFRP层合板损伤分布具有明显的方向性,各层损伤方向与铺层方向一致;C分量作用过程中CFRP层合板各层损伤分布一致,但与铺层方向无关。CFRP在两种分量作用下计算损伤分布与试验损伤形貌结果基本吻合。该文揭示了具有显著特征的两种分量雷电流对CFRP层合板的损伤机理,为CFRP层合板的雷电防护提供依据。
Carbon fiber reinforced polymer(CFRP)composite materials are widely used.However,comparing with metals and alloys,due to the lower electrical conductivity,CFRP are prone to being damaged when subjected to lightning strikes.In this study,the current dispersion and damage characteristics of CFRP laminates under the separate injection of lightning current components A and C are compared through the morphology inspection,the ultrasonic C-scan,the residual compressive strength test,and the coupled electric-thermal simulation.It is found that under the current component A,the surface layer of the CFRP laminate produces a fiber burst zone with a length of roughly 120mm and a width of roughly 30mm,whose direction is consistent with that of the laminate.In contrast,after the application of current component C,a circular ablation pit with a diameter of roughly 60mm is produced.Comparing with the undamaged laminate object,the elastic modulus of the laminate after the injection of current component A is scarcely changed,whereas that of the laminate after the injection of current component C is reduced.The maximum compressive strengths of the laminate are slightly increased after the injection of the two components.In the coupled electrical-thermal simulation,the temperature field distribution of the CFRP laminate during the delivery of the component A has obvious directionality,which is consistent with the direction of each layer.The temperature field distribution of each layer of CFRP laminate remains unchanged during the delivery of component C,but it does not relate with the direction of each layer.The temperature field distribution of CFRP under the injection of the two components is,more or less,consistent with the experimental morphology.Obtained results in this paper reveals the damage mechanism of CFRP laminates by two lightning current components with distinctive characteristics,and can provide a basis for lightning protection of CFRP laminates.
作者
周蜜
苏小玮
高俊福
王建国
单飞
Zhou Mi;Su Xiaowei;Gao Junfu;Wang Jianguo;Shan Fei(School of Electrical Engineering and Automation Wuhan University,Wuhan 430072 China;AVIC Research Institute for Special Structures of Aeronautical Composites,Jinan 250000 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2022年第S01期297-306,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51807144)
重大基础科研计划(2019207029)资助项目。
关键词
碳纤维复合材料
雷电流直接效应
损伤机理
雷电流分量
电热耦合
Carbon fiber composite material
lightning current direct effect
damage mechanism
lightning current component
coupled electrical-thermal
