An evaluation of acoustic emission techniques applied to carbon-fibre composites

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Abstract
A study has been made of the use of acoustic emission techniques to monitor failure processes within carbon-fibre-reinforced plastics and to establish some of the limitations of the technique. The type of signal to be expected from a resonant transducer of the type most widely used is discussed, and simulation studies confirm this analysis. Bundles of different types of fibres have been broken in order to investigate the type of emission obtained when fibres fracture. Sources of extraneous emission arising from the grips and from shear damage at notch tips have also been studied.