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Investigation on sensitivity of a polymer/carbon nanotube composite strain sensor |
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| Authors: | Ning Hu Yoshifumi Karube Tomonori Watanabe Yuan Li Hisao Fukunaga |
| Affiliation: | a Department of Mechanical Engineering, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan b Department of Aerospace Engineering, Tohoku University, Aramaki-Aza-Aoba 6-6-01, Aoba-ku, Sendai 980-8579, Japan c Department of Mechanical Systems Engineering, Shinshu University, 4-17-1, Wakasato, Nagano City 380-8553, Japan d School of Engineering Systems, Queensland University of Technology, 2 George St., GPO Box 2434, Brisbane, QLD 4001, Australia e State Key Laboratory of Structural Analysis of Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China |
| Abstract: | Extensive numerical simulation and experimental measurements have been conducted to understand the effects of processing parameters and material properties on sensor sensitivity in polymer/carbon nanotube (CNT) composite sensors. The numerical simulation was based on an improved three-dimensional statistical resistor network model incorporating the tunneling effect between the neighbouring nanotubes, and a fiber reorientation model. The behaviors of a sensor subjected to both tensile and compressive strains were investigated. Both numerical and experimental results indicate that a higher tunneling resistance or higher ratio of the tunneling resistance to the total resistance of the sensor leads to a higher sensor sensitivity. Processing conditions and material properties, such as weight fraction, diameter and conductivity of CNTs, curing temperature, mixing rate and barrier height of polymer matrix all play a role in determining the sensor sensitivity. |
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