Effects of surface and sizing treatments on axial compressive strength of carbon fibres |
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Authors: | M Miwa A Takeno Y Mori T Yokoi A Watanabe |
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Affiliation: | (1) Faculty of Engineering, Gifu University, Yanagido 1-1, 501-11 Gifu, Japan |
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Abstract: | Attempts have been made to estimate the fibre axial compressive strength of pitch-based graphitized fibres, and the effects of surface- and size-treatment on compressive strength was investigated. The estimated compressive strength of fibres decreases with increasing temperature. This decrease in compressive strength may be accounted for by a decrease in the radial compression force owing to a decrease in the residual thermal stress and a decrease in Young's modulus of the resin matrix. There is a linear relationship between the estimated compressive strength and radial compression force in a temperature range from room temperature to 80 °C. The real compressive strength of the fibres, determined by extrapolating this straight line until the radial compression force is zero, increases with increasing shear yield strength at the fibre-matrix interphase. In order to obtain reinforcing fibres with a higher compressive strength, it will be necessary to surface- and size-treat the fibres. |
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