Abstract
Variation of Acoustic Emission (AE) and piezoelectric parameters has been studied during electric fatigue in commercial PZT 5A ceramics. AE was found to occur mainly due to domain switching in these ceramics during the application of ac fields. In general, AE activity was found to decrease as fatigue increases and a threshold field, which increases with increasing fatigue, was observed for these signals to occur. These are explained on the basis of domain pinning. Time frequency distribution analysis performed on AE signals captured at different fatigue cycles revealed microcracking to be another source mechanism for the observed AE apart from domain switching. Additionally, this analysis has shown that microcracks might facilitate the domain switching and vice versa.
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