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Flexible Graphite as A Strain/stress Sensor

Published online by Cambridge University Press:  10 February 2011

Xiangcheng Luo  and
D.D.L. Chung
Xiangcheng Luo
Affiliation:
Composite Materials Research Laboratory, Fumas Hall, State University of New York at Buffalo, Buffalo, NY 14260–4400
D.D.L. Chung
Affiliation:
Composite Materials Research Laboratory, Fumas Hall, State University of New York at Buffalo, Buffalo, NY 14260–4400
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Abstract

Flexible graphite sandwiched by copper, after stabilization by two cycles of compressive stress, is an effective piezoresistive compressive strain/stress sensor for stresses up to 4 MPa and strains up to 25%. The stress sensitivity (fractional change in resistance per unit stress) is up to 5.4 MPa−1 and strain sensitivity (fractional change in resistance per unit strain) is up to 6.2 in the direction perpendicular to the sheet. The electrical resistance decreases reversibly upon compression, due mainly to reversible decrease in the contact resistivity between graphite and copper. Stabilization removes most of the irreversible effects. The strain/stress sensitivities decrease with increasing strain/stress.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 255
Copyright
Copyright © Materials Research Society 1997

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