Abstract
A micro-mechanical compressive test has been performed in order to study the compressive behaviour of carbon fibres. Fibre failures have been observed under an optical microscope, and the failure strains of two types of carbon fibres, high-strength and high-modulus, have been measured. Fibre micro-buckling, which takes place before the first fibre failure, has been particularly examined. A micro-mechanical analysis based on the Lee–Harris model [1]has been developed to obtain the stresses and strains in both fibre and matrix. Experimental and analytical results point out the high compressive failure strain of the high strength fibres when compared to the composite failure strain. It is therefore concluded that composite failure in compression is not initiated by fibre failure and can be clearly attributed to a combined fibre-matrix mechanism.
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