基于碳纳米管压阻效应的复合材料结构健康监测技术

复合材料结构健康监测技术是一个重要的发展方向,不断出现新的监测方法,而碳纳米管(CNT)因具有优越的传感特性得到了广泛的关注。介绍了碳纳米管及其压阻效应的形成机理,并总结了碳纳米管膜所具有的压阻特性及其相关的应用研究进展,设计了利用碳纳米管压阻效应制成的聚合物薄膜传感器在复合材料结构健康监测(SHM)中进行应用的研究方案。其中,传感器采用表面贴覆的方法和阵列式监测原理,结合特征提取、模式识别等信号处理方法,实现对复合材料的早期损伤及其类型进行预测、识别和定位等功能。

Structure Health Monitoring Technology for Composites Based on Piezoresistive Effect of Carbon Nanotubes

Structure health monitoring technology for composites is an important development direction and new monitoring methods are emerged. Carbon nanotubes （ CNTs ） have been widely studied because of their excellent sensor＇s properties. This paper introduces the mechanism of piezoresistive effect of CNTs, and summarizes the piezoresistive properties of CNTs film and researches of the related applications. The paper then designs the experimental solution of the structural health monitoring（SHM） of composites using cNT polymer film sensors based on the piezoresistive effect. Sensors based on matrix--monitoring principle are pasted on surface. Signal processing methods with feature extraction and pattern recognition are used to predict, identify and locate early failure and the failure style of composites.