caa a22 4500 463234359 CHVBK 20180405153252.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1131-3 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1131-3 Theory of piezoresistivity for strain sensing in carbon fiber reinforced cement under flexure [Elektronische Daten] [Sirong Zhu, D. Chung] 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. Springer Science+Business Media, LLC, 2007 Zhu Sirong Department of Engineering Structures and Mechanics, School of Science, Wuhan University of Technology, 430070, Wuhan, Hubei, China aut Chung D. Composite Materials Research Laboratory, University at Buffalo State University of New York, 14260-4400, Buffalo, NY, USA aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6222-6233 0022-2461 42:15<6222 2007 42 10853 https://doi.org/10.1007/s10853-006-1131-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1131-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhu Sirong Department of Engineering Structures and Mechanics, School of Science, Wuhan University of Technology, 430070, Wuhan, Hubei, China aut NATIONALLICENCE 700 1- Chung D. Composite Materials Research Laboratory, University at Buffalo State University of New York, 14260-4400, Buffalo, NY, USA aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6222-6233 0022-2461 42:15<6222 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer