Abstract
This paper proposed an Acoustic Emission (AE) based Smart Composite Fastener (SCF) concept for health monitoring of bonded/bolted composite single lap joints. The SCF was made of 3D-printed continuous carbon fibre reinforced thermoplastic materials with an embedded piezoelectric sensor. The SCF detected signals were found to be successfully associated with AE damage sources during the loading period. It was discovered that the adhesive crack/delamination AE sources resulted in burst-type signals with identifiable onset and end, whereas AE sources of frictional sliding between the SCF and fastener holes resulted in continuous-type signals producing broad frequency content. Furthermore, the amplitudes of the burst-type signal measured from the network of SCFs were successfully correlated with the locations of the damages. In the direction away from the damage, the amplitudes of the burst-type voltages measured from the SCF showed a decreasing trend, with 10195mv, 9,995mv, and 7,426mv respectively. Generally, the research in this paper explores the correlation between the voltage signal from a damaged AE source and the SCF, providing the feasibility of using a novel SCF for health monitoring in composite joint structures. • An Acoustic Emission (AE) based Smart Composite Fastener (SCF) concept for health monitoring of composite bonded/bolted joints was proposed. • Investigate the correlation between the AE source event and the detected signal: adhesive crack resulted in burst-type signals, whereas frictional sliding between the SCF and fastener holes resulted in continuous-type signals. • The correlation was verified by observations under the traveling microscope and measured strain using Distributed optical fibre sensors (DOFS). • The magnitude of the voltage signals measured by SCFs influenced by a variety of factors was clarified.
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