Theory of piezoresistivity for strain sensing in carbon fiber reinforced cement under flexure |
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Authors: | Sirong Zhu D D L Chung |
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Affiliation: | (1) Present address: Department of Engineering Structures and Mechanics, School of Science, Wuhan University of Technology, Wuhan, Hubei, 430070, China;(2) Composite Materials Research Laboratory, University at Buffalo State University of New York, Buffalo, NY 14260-4400, USA |
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Abstract: | A theory is provided for piezoresistivity in carbon fiber reinforced cement (with and without embedded steel reinforcing bars)
under flexure (three-point bending). The phenomenon, which involves the reversible increase of the tension surface electrical
resistance and the reversible decrease of the compression surface electrical resistance upon flexure, allows strain sensing.
The theory is based on the concept that the piezoresistivity is due to the slight pull-out of crack-bridging fibers during
crack opening and the consequent increase in the contact electrical resistivity of the fiber-matrix interface. This work is
an extension of prior theory, which concerns the effect of uniaxial loading on the volume resistance. The extension requires
modeling the surface resistance and its change under flexure. The theoretical results on the piezoresistivity, both with and
without rebar, are in good agreement with prior experimental results. Differences between theoretical and experimental results
are probably due to minor damage and rebar debonding during flexure. |
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Keywords: | |
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