MWCNT/EP膜片的力-电特性和无线应变传感器

An Experimental Study on Fracture Characteristic of Sandstone Subjected to Cyclic Wetting and Dryings

徐强 袁卫锋

XU Qiang YUAN Weifeng

西南科技大学制造科学与工程学院, 四川 绵阳 621010

School of Manufacturing Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China

将多壁碳纳米管（MWCNT）添加到环氧树脂（EP）中，其随机分布会形成一个复杂的导电网络。由于MWCNT在EP基体中的形状各异，个体或曲或直，相互之间或分离或交叉，使得MWCNT/EP纳米复合材料具备了电感、电阻和电容的特性。本研究提出了MWCNT/EP纳米复合材料的RLC内部等效电路，测试了0.6 wt.% MWCNT/EP纳米复合材料薄膜对电磁信号的响应。研究发现，MWCNT/EP纳米复合材料薄膜可在特定频率的电磁波激励下产生谐振，且谐振频率随着纳米复合材料的应变发生偏移，从而证明了利用MWCNT/EP纳米复合材料制备无线应变传感器的可行性。通过对MWCNT/EP纳米复合材料薄膜的力-电特性实验和理论分析，提出了开发标签式射频应变传感器的思路。

When multi-walled carbon nanotubes (MWCNTs) are added into epoxy resin (EP), the randomly distributed MWCNTs will form a complex conductive network. The MWCNTs take different shapes in the EP resin, and they are either curved or straight, separated or intersected with each other, so the MWCNT/EP nanocomposites possess the characteristics of inductance, resistance and capacitance. In this study, an equivalent RLC internal circuit of the MWCNT/EP composite material was proposed, and the response of the 0.6 wt.% MWCNT/EP composite film to electromagnetic signals was tested. It is found that the MWCNT/EP composite film can resonate under the excitation of electromagnetic waves at a specific frequency, and the resonant frequency shifts with the strain of the film. Hence, the feasibility of using MWCNT/EP composite materials to fabricate wireless strain sensors is proven. Based on the experimental and theoretical analysis of the mechanical-electric characteristics of the MWCNT/EP composite film, the idea of developing a tag-type radio frequency strain sensor is proposed in this article.

10.11885/j.issn.1674-5086.2020.09.29.03