The response of a multi-directional composite laminate to through-thickness loading |
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Authors: | VL Tagarielli G Minisgallo AJ McMillan N Petrinic |
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Affiliation: | 1. Department of Engineering Science, Parks Road, OX1 3PJ Oxford, UK;2. Rolls-Royce plc, PO Box 31, Derby DE24 8BJ, UK |
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Abstract: | The through-thickness mechanical response of a carbon fibre/epoxy laminated composite of lay-up 0/45/−45]ns is measured at low rates of strain. Uniaxial tension and compression experiments are carried out on dogbone specimens cut from a thick laminate along different directions, and failure mechanisms are observed via optical and electron microscopy. The effect of direct and shear stresses at the ply interfaces on the onset of failure is measured, and a failure envelope is constructed. The compressive response of specimens of different shape is investigated. Composite beams of different volume and aspect ratios are tested to failure in three-point bending and these tests reveal a strong dependence of the apparent out-of-plane tensile strength of the composite on the beam volume; this effect is modelled by Weibull theory. |
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Keywords: | A Carbon fibres laminate polymer matrix composites B Mechanical properties C Probabilistic methods |
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