Journal of Materials Science

, Volume 15, Issue 10, pp 2523–2538 | Cite as

Compression strength of carbon, glass and Kevlar-49 fibre reinforced polyester resins

  • M. R. Piggott
  • B. Harris


The compression behaviour of a series of polyester resins of various compositions and in different states of cure has been investigated. Their mechanical characteristics having been established, the same range of resins was then used as a matrix material for a series of composites reinforced with carbon, glass and aromatic polyamide fibres. The composites were unidirectionally reinforced, having been manufactured by pultrusion, and were compression tested in the fibre direction after a series of experiments to assess the validity of a simple testing procedure. “Rule of Mixtures” behaviour occurred in glass-polyester composites up to limiting volume fractions (Vf) of 0.31 for strength and 0.46 for elastic modulus, the compression modulus being equal to the tensile modulus, and the apparent fibre strength being in the range 1.3 to 1.6 GPa at this limiting Vf. At a Vf of 0.31 the strengths of reinforced polyesters were proportional to the matrix yield strength, σmy, and their moduli were an inverse exponential function of σmy. For the same matrix yield strength a composite with an epoxy resin matrix was stronger than polyester based composites. At Vf=0.30, Kevlar fibre composites behaved as though their compression modulus and strength were much smaller than their tensile modulus and strength, while carbon fibre composites were only slightly less stiff and weaker in compression than in tension. The compression strengths of the polyester resins were found to be proportional to their elastic moduli.


Compression Test Fibre Composite Compression Strength Epoxy Resin Matrix Tensile Modulus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    P. D. Ewins, RAE TR, 71217 (1971).Google Scholar
  2. 2.
    A. Kelly in “Strong Solids” 2nd edn. (Clarendon Press, Oxford, 1973) pp. 170–1.Google Scholar
  3. 3.
    E. Moncunill De Ferran and B. Harris, J. Comp. Mater. 4 (1970) 62.Google Scholar
  4. 4.
    M. R. Piggott and P. Wilde, J. Mater. Sci., in press.Google Scholar
  5. 5.
    T. Hayashi and K. Koyama, Proceedings of the International Conference on the Mechanical behaviour of Materials, Kyoto, Soc. Mater. Sci. Japan 5 (1971) 104.Google Scholar
  6. 6.
    N. L. Hancox, J. Mater. Sci. 10 (1975) 234.Google Scholar
  7. 7.
    B. W. Rosen, “Fibre Composite Materials” (American Society for Metals, Metals Park, Ohio) Ch. 3, 1964.Google Scholar
  8. 8.
    J. H. Greenwood and P. G. Rose, J. Mater. Sci. 9 (1974) 1809.Google Scholar
  9. 9.
    C. R. Chaplin, J. Mater. Sci. 12 (1977) 347.Google Scholar

Copyright information

© Chapman and Hall Ltd. 1980

Authors and Affiliations

  • M. R. Piggott
    • 1
  • B. Harris
    • 2
  1. 1.Centre for the Study of MaterialsUniversity of TorontoTorontoCanada
  2. 2.School of Materials ScienceUniversity of BathBathUK

Personalised recommendations