Abstract
We have studied the possibility of using multiwalled carbon nanotube (MWCNT) films asstrain sensors. The MWCNT films were prepared by a solution/filtration method and werebonded directly onto specimens by a nonconductive adhesive. For comparison, conventionalfoil strain gages were also bonded to the structure on the opposite side. The specimensthen underwent a uniaxial tensile load–unload cycle to evaluate them as strainsensors. To ensure good electrical contact between carbon nanotube film and thewires, a thin layer of copper was thermally deposited on both ends of the film aselectrodes, and the wires were connected to the electrodes by silver ink. Wheatstonebridges were used to convert the resistance changes of the MWCNTs to voltageoutput. Results indicated that the output voltages were proportional to the strainreadings from the stain indicator. The effect of temperature on the resistancewas measured and the MWCNT film resistance was found to be independent oftemperature over the range 273–363 K. The optimal film dimension for strainsensing was evaluated as well. Dynamic tests suggest that the MWCNTs were ableto extract the structural signature. Our results indicate that MWCNT film ispotentially useful for structural health monitoring and vibration control applications.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call