Micromechanical phenomena during hygrothermal ageing of model composites investigated by Raman spectroscopy. Part II: Comparison of the behaviour of PBO and M5 fibres compared with Twaron

A. J. Cervenka, R. J. Young, K. Kueseng

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Raman spectroscopy combined with gravimetry has been used to investigate hygrothermal aging in model composites based on an epoxy resin containing a single filament of a polymeric fibre. Two fibres have been studied - PBO and M5 - using two specimen configurations: The diffusion slab (DS) and the double fibre pull-out (DFPO). Time evolutions of the Raman strain profiles ε(x,t) and the water uptake M(t) have been determined for specimens immersed in liquid water. Simple micromechanical models developed for rationalising data obtained for Twaron are used to process measurements for PBO and M5 (PIPD). In this manner, a direct comparison of the time evolutions of the moisture uptake M(t), mid-fibre strain ε(x=0,t), the dimensionless Raman shear lag-parameter n and a debond length Ld allows conclusions to be drawn on the aspects of hygrothermal ageing such as durability of a fibre/matrix interface and fibre swelling. © 2004 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)1020-1026
    Number of pages6
    JournalComposites Part A: Applied Science and Manufacturing
    Volume36
    Issue number7
    DOIs
    Publication statusPublished - Jul 2005

    Keywords

    • A. Fibres
    • A. Resins
    • B. Environmental degradation
    • C. Micro-mechanics

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