Abstract
An experimental study of the compression fracture of unidirectional composites (T300/914, T800/5245C, M40J/913, GY70/V108 and AS4/ PEEK) shows that fibre kinking is the main failure mode. All materials tested exhibited a non-linear elastic behaviour characterized by a continuous decrease of the tangent modulus as soon as the load was applied. A micromechanical model taking into account initial geometric imperfections was developed. Stress evolution in the constituents was analysed and then compared with their strength. Two failure modes were distinguished: failure due to the fracture of fibres and failure due to the fracture of matrix. This model demonstrates that the non-linear behaviour is not due to the initial geometric imperfections. To refine modelling, a numerical analysis using a finite element method with elastoplastic and large displacement hypothesis was developed. This model not only shows the principals governing failure parameters: initial geometric impertions, yield stress of matrix and fibre compressive strength, but also demonstrates two failure mechanisms: fracture of fibres in compression and fibre kinking. This model confirms that the non-linear behaviour is not attributed to the initial geometric imperfections.
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