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fibres within a bundle of fibres is accurately known then the force applied to each fibre, on average, may be determined and thus yielding the average tensile strength per fibre. It may therefore be seen that determination of the number of carbon fibres in a bundle is essential for characterisation of the recycled material. A method was developed during the course of this research to accurately determine the number of carbon fibres present in a bundle. This will be presented prior to the explanation of the tensile testing of carbon fibre bundles. Electrochemical Impedance Spectroscopy Sample preparation Individual carbon fibres, T700S 50E having a diameter of 7 μm (manufacture’s data) obtained from Toray Carbon Fibres America Inc., were separated from the bulk carbon fibre tow manually under a magnifier and confirmed as single fibres by means of optical microscopy and ImageJ imaging software. Molybdenum (Mo) wire, obtained from Advent RM having a diameter of 25 μm and purity of 99.95% (manufacturers data), was used as a reference. Individual carbon fibres were then measured and cut to the specified length prior to being crimped with aluminium foil at either end to provide a gripping surface and electrical contact. Electrochemical Impedance Spectrometer Setup A Solartron 1250 Frequency Response Analyser and 1286 Electrochemical Interface were used to scan individual carbon fibres through a range of frequencies from 1.5 kHz to 10 Hz, with an amplitude of 25 mV, 25 cycle integration and 0V DC potential. Data were recorded using Zplot and analysed using Zview software (Scribner Associates Inc.). A schematic representation of the 2-point experimental setup is provided in Figure 22. 133PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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