Thin and small piezo-electric discs may be used in health-monitoring systems for composite plates. Before using them in actual systems, it is needed to prove that they do not initiate delaminations and that they are not damaged by service loadings, in particular fatigue loadings. Experiments has been done showing that if they are sufficiently small and thin, the compressive strength is not modified and that they can sustain cyclic fatigue loadings. Moreover, it is proved that the electric impedance of bonded disc can be use to check the quality of the bonding between the host structure and the discs.
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