Piezoresistive strain sensors in the form of short carbon fiber composites

Xiaojun Wang; Xuli Fu; Deborah D. L. Chung

doi:10.1117/12.316854

20 July 1998 Piezoresistive strain sensors in the form of short carbon fiber composites

Xiaojun Wang, Xuli Fu, Deborah D. L. Chung

Proceedings Volume 3324, Smart Structures and Materials 1998: Smart Materials Technologies; (1998) https://doi.org/10.1117/12.316854
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

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.

Citation Download Citation

Xiaojun Wang, Xuli Fu, and Deborah D. L. Chung "Piezoresistive strain sensors in the form of short carbon fiber composites", Proc. SPIE 3324, Smart Structures and Materials 1998: Smart Materials Technologies, (20 July 1998); https://doi.org/10.1117/12.316854

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