碳纤维增强型复合材料在非破坏雷电流脉冲下的动态导电特性

Dynamic Electrical Properties of Carbon Fiber Reinforced Polymer Subjected to Non-Destructive Lightning Impulse

为了研究碳纤维增强型复合材料(CFRP)层合板在雷电流脉冲作用下的动态导通机制,建立了CFRP动态导电特性实验平台,通过研究非破坏性10/30、20/60及40/120μs的雷电流脉冲作用下CFRP层合板的动态响应,分析了铺层结构、试样夹持方式及雷电流参数对CFRP动态导电特性的影响。研究结果表明:在100～1 000A的雷电流作用下,受到内部铺层结构的影响,CFRP层合板厚度方向电导率(10-3 S/mm)远小于平面方向电导率(100S/mm),具有各向异性非线性电导率;CFRP层合板表现出明显的电感效应,即动态电压超前于电流,动态伏安特性曲线中上升与下降阶段不重合;施加的雷电流上升速率越低、波长越长,CFRP层合板动态电导率越大;CFRP层合板在雷电流脉冲作用下所表现出的电感效应与碳纤维丝的电感特性密切相关。CFRP动态导电特性及导通模型的研究能够为CFRP雷电直接效应热电耦合模型的建立以及CFRP性能优化和结构提升提供理论支撑。

To obtain the dynamic electrical properties of carbon fiber reinforced polymer(CFRP)laminates subjected to a lightning current impulse,an experimental platform generating lightning current impulses of 10/30,20/60 and 40/120μs is constructed.The conduction mechanism of CFRP laminates and the effects of layer structure,sample clamping schedule and applied lightning impulse parameters on the dynamic electrical properties of CFRP are analyzed.The experimental results indicate that the in-thickness conductivity(10-3 S/mm)gets much smaller than the in-plane conductivity(10 0 S/mm)under the effect of lightning current of 100-1 000 A due to the anisotropic nonlinear conductivity affected by the internal layup structure of CFRP laminates.In addition,the voltage of CFRP sample reaches the peak value prior to the impulse current,the dynamic conductivity of CFRP laminates increases with the reduced rising rate and increasing duration of applied lightning current and the inductance properties of CFRP laminates closely relate to the inductive effect of carbon fibers.The dynamic electrical properties and conduction model of CFRP laminates subjected to a lightning impulse can provide theoretical supports for the establishment of the thermo-electric coupling model of CFRP lightning direct effect,optimization and improvement of CFRP materials.