Zhang W, Suhr J, Koratkar N
Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
J Nanosci Nanotechnol. 2006 Apr;6(4):960-4. doi: 10.1166/jnn.2006.171.
In this study we demonstrate that multiwalled carbon nanotube fillers can impart a strain sensing functionality to a composite. The nanocomposite is fabricated by dispersing 5% weight of multiwalled nanotube fillers into a polycarbonate matrix. When subjected to linear and sinusoidal dynamic strain inputs, the instantaneous change in the electrical resistance (deltaR/R0) of the nanocomposite responds in a manner similar to a strain gage. The sensitivity of the nanocomposite sensor was measured to be approximately 3.5 times that of a typical strain gage. This sensitivity of the nanocomposite's electrical properties to mechanical stress implies that in addition to enhancing mechanical properties (strength, stiffness, structural damping, etc.), these multifunctional materials show the potential to provide real-time structural health monitoring and self-diagnostic functionalities.
在本研究中，我们证明了多壁碳纳米管填料可赋予复合材料应变传感功能。通过将5%重量的多壁纳米管填料分散到聚碳酸酯基体中来制备纳米复合材料。当受到线性和正弦动态应变输入时，纳米复合材料的电阻瞬时变化（deltaR/R0）的响应方式类似于应变片。测得纳米复合材料传感器的灵敏度约为典型应变片的3.5倍。纳米复合材料电学性能对机械应力的这种敏感性意味着，除了增强机械性能（强度、刚度、结构阻尼等）外，这些多功能材料还具有提供实时结构健康监测和自诊断功能的潜力。
