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Ring-shaped lead zirconate titanate (PZT) piezoelectric vibrators were subjected to non-uniform mechanical stress applied by bolt clamping. The effect of mechanical stress on the effective electromechanical coupling factor (k eff ) and mechanical quality factor (Q m ) of the thickness and wall thickness modes was studied by an equivalent electric circuit analysis. The initiation...
Initiation and propagation of cracks in lead zirconate titanate (PZT) piezoelectric rings under a non-uniform mechanical loading were studied. The PZT ring was sandwiched between two pieces of metals and then compressed by a torque. Bolt clamping produced a non-uniform external stress on the PZT ring and caused various degree of depoling at different positions of the ring. A large torque also initiated...
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