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Strain sensing using carbon fiber

Published online by Cambridge University Press:  31 January 2011

Xiaojun Wang
Affiliation:
Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, New York 14260-4400
Xuli Fu
Affiliation:
Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, New York 14260-4400
D. D. L. Chung
Affiliation:
Composite Materials Research Laboratory, State University of New York at Buffalo, Buffalo, New York 14260-4400
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Abstract

Carbon fiber provides strain sensing through change in electrical resistance upon strain. Due to piezoresistivity of various origins, a single carbon fiber in epoxy, an epoxy-matrix composite with short carbon fibers (5.5 vol%), a cement-matrix composite with short carbon fibers (0.2–0.5 vol%), and an epoxy-matrix composite with continuous carbon fibers (58 vol%) are strain sensors with fractional change in resistance per unit strain up to 625. A single bare carbon fiber is not piezoresistive, but just resistive.

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Copyright
Copyright © Materials Research Society 1999

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