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Compression fracture of unidirectional carbon fibre-reinforced plastics

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Abstract

The effect of volume fraction and tensile strength of fibres, temperature and stress concentrators on the compression strength and fracture mode of unidirectional CFRP was studied. The cause of kinking is different for composites reinforced by low-(<3 GPa) and high-strength fibres. If fibre strength is high, the kink is initiated by composite splitting followed by fibre bend fracture in the tip of the split. In the case of low-strength fibres, kinking is initiated by compressive fracture of the fibres. The effect of stress concentrators on the CFRP compressive strength is described by linear fracture mechanics. In the presence of defects, fracture is a result of the emergence of splits near a hole. As the critical stress of splitting growth initiation reduces in proportion to the square root of the defect size, the Griffith criterion describes the composite compressive fracture. At elevated temperature, failure is caused by fibre buckling. The fracture band in this case is oriented perpendicular to the fibre direction. Carbon fibre compressive strength may be measured by the loop method. Bending a strand of carbon fibres glued to the elastic beam gives a fibre-controlled upper limit of the composite compressive strength.

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Author notes

  1. S. L. Bazhenov

    Present address: Department of Macromolecular Science, Case Western Reserve University, 44106, Cleveland, OH, USA

Authors and Affiliations

  1. Institute of Chemical Physics, Kosygin St. 4, 117 977, Moscow, USSR

    S. L. Bazhenov & V. V. Kozey

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  1. S. L. Bazhenov
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  2. V. V. Kozey
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Bazhenov, S.L., Kozey, V.V. Compression fracture of unidirectional carbon fibre-reinforced plastics. J Mater Sci 26, 6764–6776 (1991). https://doi.org/10.1007/BF02402672

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