Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials

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Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials ( supercritical-fluids-and-their-application-recycling-high-pe )

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fibre is directly proportional its length, the limit of detection (LOD) is also a function of the fibre length. The LOD increases with increasing fibre length as shown in Table 22. Table 22: Limit of Detection (LOD) for determination of number of fibres in a bundle by EIM Nominal Length (mm) 80 85 120 150 200 250 300 L.O.D. (# of fibres) 215,000 235,000 315,000 355,000 505,000 635,000 720,000 The work herein demonstrates that there is no frequency dependence when measuring the impedance of carbon fibres, and as such, carbon fibres behave as resistors. Consequently it would be possible to conduct this procedure using less sophisticated equipment, operating with Direct Current (DC) as opposed to Alternating Current (AC) as performed here. DC measurements of carbon fibres yield resistance, where the magnitude of the resistance is identical to the magnitude of the impedance since the phase angle is 0. The approach presented was necessary to demonstrate the applicability, reliability and validity of the method. Tensile Testing of Multiple Carbon Fibres by means of Universal Testing Machine After determining the number of carbon fibres present within a bundle, the bundle was placed in a bespoke carbon fibre alignment tool, Figure 30. 148

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