Disbond monitoring of adhesive joints reinforced with carbon nanofibres

Raj B. Ladani, Shuying Wu, Adrian P. Mouritz, Anthony J. Kinloch, Kamran Ghorbani, Chun H. Wang

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

This paper focuses on the ability of carbon nanofibre (CNF) networks for in situ monitoring of fatigue induced disbond damage in carbon fibre adhesive bonded joints. The mode I fatigue delamination behaviour of composite joints bonded with an unmodified epoxy adhesive and 0.7 wt% CNF modified epoxy adhesive are evaluated. The inclusion of CNFs in the epoxy adhesive increases its conductivity by five orders of magnitude while simultaneously retarding the delamination growth rate. The mode I critical strain energy of the CNF modified adhesive increases by about five folds from 88 J/m2 to 450 J/m2 under cyclic fatigue loading. The improved electrical conductivity is utilized to evaluate the ability of the CNF network to monitor and detect the fatigue induced disbond damage by in situ measuring the resistance changes using a four probe setup. The changes in total resistance was a function of the bulk electrical resistivity of the adhesive and the bond dimensions, which were related to the disbond length to model and determine the size of the disbond. Good agreement were found between the optical disbond observations and the calculated disbond length using the in situ resistance measurements, therefore proving the ability of CNFs to not only detect delamination as small as 1 mm in composite bonded joints but also retard its growth rate.

Original languageEnglish
Title of host publicationICCM20
Subtitle of host publication20th International Conference on Composite Materials: proceedings
Number of pages8
Publication statusPublished - 2015
Externally publishedYes
Event20th International Conference on Composite Materials, ICCM 2015 - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015

Conference

Conference20th International Conference on Composite Materials, ICCM 2015
CountryDenmark
CityCopenhagen
Period19/07/1524/07/15

Keywords

  • Nanocomposite adhesive
  • In situ monitoring
  • Disbond detection
  • Fatigue delamination
  • Electric resistance

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  • Cite this

    Ladani, R. B., Wu, S., Mouritz, A. P., Kinloch, A. J., Ghorbani, K., & Wang, C. H. (2015). Disbond monitoring of adhesive joints reinforced with carbon nanofibres. In ICCM20: 20th International Conference on Composite Materials: proceedings