多层纤维增强环氧树脂复合材料结构设计与电磁屏蔽效能预测模型

Structural Design and Electromagnetic Shielding Effectiveness Prediction Model of Multilayer Fiber Reinforced Epoxy Composites

构建渐进导电网络结构是一种降低导电材料电磁波反射率的有效策略。利用芳纶纤维(AF)、还原氧化石墨烯负载芳纶纤维(rGO@AF)与碳纤维(CF),制备多层纤维增强环氧树脂复合材料(AF/rGO@AF/CF/EP),研究CF/EP和AF/rGO@AF/CF/EP的电磁屏蔽性能。通过单层纤维的电磁参数和电导率预测,得到多层纤维增强环氧树脂复合材料电磁屏蔽效能的简化模型。结果表明:单层CF/EP的反射损耗效能(SE_(R))为12.3 dB,总电磁屏蔽效能(SET)为40.2 dB,与之相比,AF/rGO@AF/CF/EP的SER降至9.6 dB,SET提高至43.6 dB,说明梯度导电网络结构在保证材料屏蔽效能的同时降低复合材料的反射损耗。利用简化模型得到AF/rGO@AF/CF/EP的电磁屏蔽效能为42.6 dB,表明该模型准确预测多层结构复合材料的电磁屏蔽性能。

Constructing a progressive conductive network structure is an effective strategy to reduce the electromagnetic wave reflectivity of conductive materials.Aramid fiber(AF),reduced graphene oxide loaded aramid fiber(rGO@AF)and carbon fiber(CF)were used to prepare multi-layer fiber reinforced epoxy resin composites(AF/rGO@AF/CF/EP).The electromagnetic shielding properties of CF/EP and AF/rGO@AF/CF/EP were studied.A simplified model of electromagnetic shielding effectiveness of multi-layer fiber reinforced epoxy resin composites is obtained by predicting the electromagnetic parameters and conductivity of single-layer fiber.The results show that the reflection loss efficiency(SE_(R))of the single-layer CF/EP is 12.3 dB,and the total electromagnetic shielding effectiveness(SET)is 40.2 dB.In contrast,the SER of AF/rGO@AF/CF/EP is reduced to 9.6 dB,and the SETis increased to 43.6 dB,indicating that the gradient conductive network structure reduces the reflection loss of composite while ensuring the shielding effectiveness of material.The electromagnetic shielding effectiveness of AF/rGO@AF/CF/EP obtained by simplified model is 42.6 dB,indicating that model accurately predicts the electromagnetic shielding performance of multi-layer structural composites.