Comparing single-walled carbon nanotubes and samarium oxide as strain sensors for model glass-fibre/epoxy composites

Paweena Sureeyatanapas, Marek Hejda, Stephen J. Eichhorn, Robert J. Young

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The study of the interfacial stress transfer for glass fibres in polymer composites through the fragmentation test requires certain assumptions, such as a constant interfacial shear stress. In order to map the local interfacial properties of a composite, both Raman spectroscopy and luminescence spectroscopy have been independently used. Unlike other polymer fibre composites, the local strain state of a glass fibre cannot be obtained using Raman spectroscopy, since only very broad and weak peaks are obtainable. This study shows that when single-walled carbon nanotubes (SWNTs) are added to the silane sizing as a strain sensor, it becomes possible to map the local fibre strain in glass fibres using Raman spectroscopy. Moreover, if this model glass fibre contains a small amount of Sm2O3, as one of the components, luminescence spectroscopy can be simultaneously used to confirm this local fibre strain. A combined micromechanical properties study of stress transfer at the fibre-matrix interface using luminescence spectroscopy, together with Raman spectroscopy, is therefore reported. The local strain behaviour of both Sm3+ doped glass and SWNTs in the silane coating are shown to be consistent with a shear-lag model. This indicates that Sm3+ dopants and SWNTs are excellent sensors for the local deformation of glass fibre composites. © 2009 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)88-93
    Number of pages5
    JournalComposites Science and Technology
    Volume70
    Issue number1
    DOIs
    Publication statusPublished - Jan 2010

    Keywords

    • A. Carbon nanotubes
    • A. Glass fibres
    • B. Fragmentation
    • B. Interfacial strength
    • D. Raman spectroscopy

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