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CHAPTER 6. RESULTS PART C: CHARACTERISATION AND RECYCLING OF CARBON FIBRE 6.1. TENSILE PROPERTIES OF RECYCLED CARBON FIBRES Carbon fibres were subjected to reaction conditions that had demonstrated a capability to decompose either thermoplastic or thermoset resins. By subjecting the fibres to these conditions, the objective was to identify the effects of the reaction conditions on the fibres in a direct manner, without the added complication of the effects of polymer degradation products. Having developed a method for counting [245],with precision, the number of carbon fibres within a bundle this research aims to extend the tensile testing of carbon fibres to bundles (as opposed to single fibres). This approach allows for the testing of several hundred fibres within a very small number of experiments, something that is fundamentally not possible with single fibre testing. The reaction conditions used are presented in Chapter 3.3.4. and the analytical equipment setup is provided in Chapter 3.4.4. When testing carbon fibre bundles, aside from accurately determining the number of fibres, other factors may influence the results. The tensile strength calculated is the mean tensile strength of a single fibre within the bundle and it is acknowledged that the strength of any given fibre may deviate from this value. However, since individual fibres are not used alone, the strength of a single fibre is of little consequence and thought to be less valuable than an understanding of the entire bundle. A complication exists in the fibre alignment. To date, there has not been a suitable method for the re-alignment of recycled fibres. Recycled fibres are currently being considered for the manufacture of random chopped mats, which by 256PDF Image | Supercritical Fluids and Their Application to the Recycling of High-Performance Carbon Fibre Reinforced Composite Materials
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