Analysis of the impedance spectra of short conductive fiber-reinforced composites

J. M. Torrents, Thomas O Mason, A. Peled, S. P. Shah, E. J. Garboczi

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

The presence of small amounts of short conductive fibers in a composite of finite matrix conductivity results in the subdivision of the one matrix impedance arc into two separate low and high frequency arcs in the complex impedance plane. These features are attributable to a "frequency-switchable" interracial impedance on the fiber surfaces, rendering them insulating at DC and low AC frequencies, but conducting at intermediate frequencies. A combination of physical simulations (single wires in tap water) and pixel-based computer modeling was employed to investigate the roles of fiber pull-out, debonding, and orientation on the impedance response of fiber-reinforced composites. The ratio of the low frequency arc size to the overall DC resistance (γ-parameter) is sensitive to pull-out and/or debonding, especially when a fiber just barely makes contact with the matrix. The γ-parameter is also quite sensitive to fiber orientation with respect to the direction of the applied field. Ramif ications for the characterization of cement, ceramic, and polymer matrix composites are discussed.

Original languageEnglish
Pages (from-to)4003-4012
Number of pages10
JournalJournal of Materials Science
Volume36
Issue number16
DOIs
Publication statusPublished - Aug 15 2001

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Fibers
Composite materials
Debonding
Polymer matrix composites
Ceramic matrix composites
Fiber reinforced materials
Cements
Pixels
Wire
Water
Direction compound

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Analysis of the impedance spectra of short conductive fiber-reinforced composites. / Torrents, J. M.; Mason, Thomas O; Peled, A.; Shah, S. P.; Garboczi, E. J.

In: Journal of Materials Science, Vol. 36, No. 16, 15.08.2001, p. 4003-4012.

Research output: Contribution to journalArticle

Torrents, J. M. ; Mason, Thomas O ; Peled, A. ; Shah, S. P. ; Garboczi, E. J. / Analysis of the impedance spectra of short conductive fiber-reinforced composites. In: Journal of Materials Science. 2001 ; Vol. 36, No. 16. pp. 4003-4012.
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