Capacitive imaging of impact damage in composite material

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Abstract

This work presents capacitive non-destructive imaging of impact damage in woven fibre CFRP using a coplanar capacitive sensor. Novelty of the approach consists in that spectral characteristics of the capacitive sensor response to CFRP properties are firstly used to establish excitation frequencies for optimum imaging of delamination. For the tested samples optimum excitation frequencies were found to be above 200MHz. Clear capacitive images of delaminations were obtained on each sample. Ultrasonic (UT) Cscans of delaminations due to impacts were acquired using phased array technique to confirm presence and extent of the delaminations. Capacitive imaging technique can be used as complementary to UT for imaging shallow defects in composite materials at depths where UT has insufficient time domain resolution.
Original languageEnglish
JournalComposites Part B: Engineering
Early online date10 Jan 2017
DOIs
Publication statusE-pub ahead of print - 10 Jan 2017

Keywords

  • carbon fibre
  • delamination
  • non-destructive tesing
  • capacitive imaging

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