Abstract
Adhesively bonded joints between two plates are gradually receiving increasingacceptance in safety-critical structures, and therefore methods for nondestructiveevaluation (NDE) of adhesive joints have drawn much attention. In this paper,specimens with lap splice joints are prepared for the purpose of guided-wave-baseddebonding damage detection. Fibre optic Doppler (FOD) sensors are used toacquire guided ultrasonic waves propagating in two kinds of bonded specimens,namely aluminium and carbon fibre reinforced plastic (CFRP) assemblies. Toovercome the drawbacks of sensor networks in conventional structural healthmonitoring systems, a self-calibration sensor network is constructed based on elasticanalyses of the bonded structures. By using the proposed sensor network, both thebaseline measurement and the defect-related guided wave signals can be acquired inone excitation experiment. Moreover, complicated signal interpretation is alsoavoided by using the simplest feature, arrival time, of the ultrasonic wave signals.
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