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Proceedings Paper

Piezoresistive strain sensors in the form of short carbon fiber composites
Author(s): Xiaojun Wang; Xuli Fu; Deborah D. L. Chung
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Paper Abstract

Short carbon fibers (5 mm long, 15 micrometers diameter) in polymer and cement matrices provide piezoresistive strain sensors that have their DC electrical resistivity change reversibly upon strain. For fibers (5 - 10 vol.%) in an epoxy matrix, the resistivity increases upon tension and decreases upon compression, due to the change in proximity between adjacent fibers in the composite, the gage factor (fractional change in electrical resistance per unit strain) is up to 97 under compression and up to 24 under tension. For fibers (0.2 - 0.5 vol.%) in a cement matrix, the resistivity increases upon tension and decreases upon compression, due to the change in contact resistivity between fiber and matrix; the gage factor is up to 700.

Paper Details

Date Published: 20 July 1998
PDF: 12 pages
Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); doi: 10.1117/12.316854
Show Author Affiliations
Xiaojun Wang, SUNY/Buffalo (United States)
Xuli Fu, SUNY/Buffalo (United States)
Deborah D. L. Chung, SUNY/Buffalo (United States)


Published in SPIE Proceedings Vol. 3324:
Smart Structures and Materials 1998: Smart Materials Technologies
Manfred R. Wuttig, Editor(s)

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