Strain sensing in single carbon fiber epoxy composites by simultaneous in-situ Raman and piezoresistance measurements

Nataliya Kalashnyk*, Eric Faulques, Jan Schjødt-Thomsen, Lars R. Jensen, Jens Chr M Rauhe, Ryszard Pyrz

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

37 Citations (Scopus)

Abstract

The change of electrical resistance in continuous single carbon fibers and single carbon fiber/epoxy model composites with applied strain has been investigated with a new method combining simultaneous in-situ Raman and electromechanical measurements. In all cases, a sudden increase to infinity of the relative electrical resistance corresponds to fiber fracture. The gage factors of the piezoresistance curves were determined. Reinforcement/matrix interface are compared for sized and unsized systems. It is shown that, in principle, it is possible to correlate the fiber strain and the variation of electrical fiber resistance as a function of the applied strain for a single fiber embedded in epoxy. This study indicates that carbon fibers embedded in epoxy matrix may serve as electrical strain sensors to detect both their own onset of damage and that of the composite under load, prior to specimen fracture.

Original languageEnglish
JournalCarbon
Volume109
Pages (from-to)124-130
Number of pages7
ISSN0008-6223
DOIs
Publication statusPublished - 1 Nov 2016

Keywords

  • Carbon fibers
  • Electric resistance
  • Fracture
  • Applied strain
  • Carbon fiber epoxy composites
  • Electrical resistances
  • Electromechanical measurements
  • Epoxy matrices
  • Model composites
  • Piezoresistance
  • Strain sensing

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