OS0302 Two-Dimensional Strain Distribution Sensor Using Carbon Nanotube

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  • OS0302 カーボンナノチューブ応用二次元ひずみ分布計測センサの試作(OS3-1 ひずみ,OS-3 非破壊評価と構造モニタリング1)

Abstract

A new highly sensitive strain measurement method has been developed by applying the change of the electronic conductivity of CNTs. Multi-walled CNTs were dispersed in various kinds of resins such as epoxy, polycarbonate, and polyisoprene to form a thin film which can be easily attached to rounded surfaces. The length and diameter of the CNTs were about 5 μm and 50 nm, respectively. One of the base materials of resin employed was polycarbonate and the volumetric concentration of CNT dispersed was about 11.5%. The thickness of the film was about 500 μm. Uni-axial strain was applied to the CNT-dispersed resin by applying a 4 point bending method, and the change of the electric resistance was measured. The range of the applied strain was from -0.025% to 0.025%. The electric resistance changed almost linearly with the applied strain. The ratio of the resistance change under the tensile strain was about 400%/%strain and that under the compressive strain was about 150%/%strain. Two-dimensional strain fields were evaluated by using finely area-arrayed CNT-dispersed resin made by MEMS technology with spatial resolution of 50 μm.

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