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aviation components on the exterior of an airframe [239]. Attempts to increase the impact the impact resistance further for defence applications by using additional materials, such as Kevlar fibres or aluminium, has yielded limited success when considering the impact resistance per unit mass of composite [240]. The effect of the cross-sectional thickness of CFRP’s on the impact resistance has also been presented in the literature, with results showing that the increased impact resistance is most pronounced when the projectile velocity is low [241-243]. Cracks introduced to the composite may propagate through the resin rich areas between the fibre layers, through the fibre layers or a combination of both. It has been suggested that the propagation of cracks through these regions is not identical and therefore research into strengthening the resin rich area between fibres has been carried out with limited success [244]. Given that carbon fibres readily conduct electricity it has been possible to utilise this property to obtain the diameter or number of fibres within a bundle by measuring the resistance [245]. Electrical conductivity of CFRP’s is possible due to the carbon fibre content, the epoxy resin is essentially an electrical insulator, and therefore the resistance of the composite is a function of the layup process and fibre orientation [246]. It follows that for a single fibre, breakage leads to discontinuity and the resistance tends to infinity, for a bundles of fibres breakage of a proportion of the bundle leads to a proportional increase in resistance. This fundamental principle has been the subject of much research into damage detection and delamination of CFRP’s [247-251], an area of great importance since physical damage and delamination of the bulk material may not be visible from the CFRP surface. Literature sources show that research in this area continues to 62PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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