Abstract
A systematic experimental investigation has been conducted on glass-fibre/epoxy composites with fibres of different cross-sectional shapes (round, peanut-shaped and oval) in order to evaluate the influence of the fibre cross-sectional aspect ratio on Mode I and Mode II interlaminar fracture toughness, interlaminar shear strength, and Charpy impact properties. Because of large fibre contact areas induced by fibre overlapping, a low delamination resistance was observed for such composite systems reinforced by glass fibres with large fibre cross-sectional aspect ratios, compared with a composite system reinforced by conventional round fibres. Test results from double-cantilever beam (DCB), end-notched-flexure (ENF) and short-beam-shear (SBS) tests showed the same trend that the resistance to delamination decreased with the increase of fibre cross-sectional aspect ratios. However, the composite system reinforced by glass fibres with the large cross-sectional aspect ratio exhibited better energy-absorbing capacity than the composite system reinforced by conventional round fibres.
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