Journal of Materials Science

, Volume 16, Issue 10, pp 2831–2836 | Cite as

The compression strength of composites with kinked, misaligned and poorly adhering fibres

  • G. M. Martinez
  • M. R. Piggott
  • D. M. R. Bainbridge
  • B. Harris
Papers

Abstract

Experiments carried out on pultruded fibre reinforced polyester resins show that, at moderate fibre volume fractions, the compressive strength of aligned fibre composites depends linearly on the volume fraction. The strength falls off when the fibre volume fraction,Vf=0.4 with Kevlar and high strength carbon fibres. The effective fibre strength atVf<0.4 is much less than the tensile strength but it is close to the tensile strength with E-glass fibres and high modulus carbon fibres. Poor adhesion between fibres and matrix reduces the compressive strength, as does kinking the fibres when the fibre radius of curvature is reduced to below 5 mm. Misalignment of the fibres reduces the compressive strength when the average angle of misalignment exceeds about 10° for glass and carbon fibres. However, with Kevlar no such reduction is observed because the compression strength of Kevlar reinforced resin is only a very little better than that of the unreinforced resin.

Keywords

Compressive Strength Carbon Fibre Compression Strength Fibre Volume Fraction Fibre Strength 

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Copyright information

© Chapman and Hall Ltd. 1981

Authors and Affiliations

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

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