基于碳纳米传感器的复合材料内部缺陷测量及误差估计

Measurement and Error Estimation of Internal Defects for Three-dimensional Braided Composites Based on Carbon Nanotube Thread Sensor

结合三维编织复合材料制造工艺,提出了利用碳纳米线传感器对三维编织复合材料试件缺陷检测的应用方法。论述了碳纳米线传感器嵌入三维编织复合材料预制件的方式,分析了碳纳米线传感器的力学特性。分析了编织角对嵌入碳纳米线传感器的影响。系统使用传统的应变放大器测量电阻变化。最后,应用响应面法对实验结果进行统计分析。实验表明,本实验的研究方法成功地实现了三维编织复合材料内部缺陷位置和大小的估计。

According to braiding process of three-dimensional braided composites,the paper proposes nondestructive testing method for three-dimensional braided composites based on carbon nanotube thread sensor. Discussed the way of the carbon-nano thread sensors embedded in three-dimensional braided composite preform. Analyzed the mechanical properties of carbon nanotube thread sensors. We analyzed the braiding angle influence on carbon nanotube thread sensor embedded into preform. The electric resistance changes were measured using conventional strain gage amplifier. Finally,the experimental results were analyzed using response surface method. As a result,the present method successfully provides estimations of location and size of internal defects for three-dimensional braided composites.