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Analysis of interfacial micromechanics of model composites using synchrotron microfocus X-ray diffraction

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Abstract

The deformation micromechanics of single-fibre embedded model composites of poly(p-phenylene benzobisoxazole) (PBO) and poly(p-phenylene terephthalamide) (PPTA) fibres, embedded in an epoxy resin have been examined using synchrotron microfocus X-ray diffraction. Single fibres (in air) were deformed and the c-spacing monitored to establish a calibration of crystal strain against applied stress. Subsequently, the variation in crystal strain along fibres, embedded in the resin matrix was mapped using synchrotron microfocus X-ray diffraction. Raman spectroscopy was then used to map molecular deformation on the same samples (recorded as shifts in the Raman band wavenumber) in order to provide a complementary stress data. A shear-lag analysis was conducted on the axial fibre stress data in order to calculate interfacial shear stress and identify different stress-transfer modes at fibre/resin interfaces. The results establish that the axial fibre stress distributions measured by synchrotron microfocus X-ray diffraction correlate well with those obtained using Raman spectroscopy. The interfacial shear stress data derived from the stress-transfer profiles also show a good degree of correlation.

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Acknowledgements

The authors would like to thank Manfred Burghammer at ESRF beamline ID13 for assisting with the experimental set-up. They would also like to thank Teijin and Toyobo for supplying the PPTA and PBO fibre samples, respectively. Our gratitude also extends to Andrew Hammersley for use of the FIT2D software application and colleagues in the Manchester Materials Science Centre who have collaborated with us in this study. This research was supported by the EPSRC (grant code EP/C002164/1).

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Authors and Affiliations

  1. Materials Science Centre, School of Materials, University of Manchester, Grosvenor St., Manchester, M1 7HS, UK

    Y. T. Shyng, J. A. Bennett, R. J. Young & S. J. Eichhorn

  2. European Synchrotron Radiation Facility, B.P. 220, F-38043, Grenoble, Cedex, France

    R. J. Davies

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  1. Y. T. Shyng
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  2. J. A. Bennett
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  3. R. J. Young
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  4. R. J. Davies
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  5. S. J. Eichhorn
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Correspondence to R. J. Young.

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Shyng, Y.T., Bennett, J.A., Young, R.J. et al. Analysis of interfacial micromechanics of model composites using synchrotron microfocus X-ray diffraction. J Mater Sci 41, 6813–6821 (2006). https://doi.org/10.1007/s10853-006-0211-8

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  • DOI: https://doi.org/10.1007/s10853-006-0211-8

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