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Negative piezoresistivity in continuous carbon fiber epoxy-matrix composite

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Abstract

The negative and positive piezoresistivity in continuous carbon fiber epoxy-matrix composite has been clarified. The negative piezoresistivity associated with the increase of the through-thickness resistivity upon longitudinal tension and decrease in the through-thickness resistivity upon longitudinal compression is practically attractive for strain sensing and is attributed to the decrease in the degree of contact between fibers of adjacent laminae upon longitudinal tension. This effect is stronger, more reversible and less prone to causing minor damage for the tension case than the compression case. The positive piezoresistivity associated with the longitudinal resistivity increasing upon longitudinal tension is negligibly weak, if any, independent of the number of laminae. The previously reported negative piezoresistivity associated with the longitudinal resistivity decreasing upon longitudinal tension does not occur for a commercially manufactured composite in which the fibers are well aligned.

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Authors and Affiliations

  1. Composite Materials Research Laboratory, University at Buffalo, State University of New York, Buffalo, NY, 14260-4400, USA

    Shoukai Wang & D. D. L. Chung

Authors
  1. Shoukai Wang
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  2. D. D. L. Chung
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Correspondence to D. D. L. Chung.

Appendix: Glossary

Appendix: Glossary

Negative piezoresistivity A: the resistivity in the through-thickness direction increasing upon uniaxial tension in the longitudinal direction.

Negative piezoresistivity B: the resistivity in the transverse direction decreasing upon uniaxial tension in the longitudinal direction.

Negative piezoresistivity C: the longitudinal resistance decreasing upon compression in the through-thickness direction.

Negative piezoresistivity D: the longitudinal resistivity decreasing upon uniaxial tension in the longitudinal direction.

Positive piezoresistivity A: the contact electrical resistivity of the interlaminar interface decreasing upon compression in the through-thickness direction.

Positive piezoresistivity B: the longitudinal resistivity increasing upon uniaxial tension in the longitudinal direction.

Positive piezoresistivity C: the longitudinal resistivity increasing upon longitudinal tension when the two-probe method is used.

Positive piezoresistivity D: the resistance in the transverse direction increasing with transverse strain/stress.

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Wang, S., Chung, D.D.L. Negative piezoresistivity in continuous carbon fiber epoxy-matrix composite. J Mater Sci 42, 4987–4995 (2007). https://doi.org/10.1007/s10853-006-0580-z

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  • DOI: https://doi.org/10.1007/s10853-006-0580-z

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