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Continuous Deformation Monitoring by polymermatrix carbon fiber sensitive layer

Journal of Wuhan University of Technology(Materials Science) 2016年第3期31卷 705-712页

作者：郑华升 ZHU Sirong LI Zhuoqiu The State Key Laboratory of Refractories and Metallurgy (Wuhan University of Science and Technology) School of Science Wuhan University of Science and Technology School of Science Wuhan University of Technology

Composite made of short-cut carbon fiber mat and vinyl ester resin was observed to be an effective sensor for tensile strain up to 6 000με. Based on its strain sensitivity, a skin-like sensitive layer which can continuously cover the structural surface to sense strain in large area was developed. The sensitive layer was applied to continuously monitor the deformation of a simply supported beam. The result indicates that the fractional change in electrical resistance of the sensitive layer reversibly reflects the beam deformation in each section and describes the distribution of the average strain of the beam. The effect of temperature change on the monitoring was studied by monitoring tests conducted at different temperatures ranging from 20 to 80 ℃, which reveals temperature sensitivity in the sensitive layer and the temperature dependence of the piezoresistive behavior when the temperature exceeds 50 ℃. By the application of differential conaection principle, a method for temperature compensation was established and the gauge factor for the monitoring was dramatically increased. This method was verified experimentally.

关键词： polymer-matrix carbon fiber sensitive layer strain sensitivity continuous deformation monitoring temperature compensation

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