Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14590
Title: Behavior of a PZT ring under non-uniform mechanical stress
Authors: Xu, CH
Hu, JH
Chan, HLW 
Keywords: Crack
Effective electromechanical coupling factor keff
Mechanical quality factor Qm
Mechanical stress
PZT vibrator
Issue Date: 2002
Publisher: Elsevier
Source: Ultrasonics, 2002, v. 39, no. 10, p. 735-742 How to cite?
Journal: Ultrasonics 
Abstract: 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 (keff) and mechanical quality factor (Qm) of the thickness and wall thickness modes was studied by an equivalent electric circuit analysis. The initiation and propagation of cracks under mechanical stress were also discussed based on the resonance method and the indentation technique. keff for both the thickness and wall thickness modes decreased with increase in mechanical stress due to de-poling of the PZT. Qm of the thickness mode dropped sharply with increase in mechanical stress while Qm of the wall thickness mode remained almost unchange. Existence of microcracks in a PZT vibrator can be detected by the occurrence of spurious vibrations at the wall thickness mode in the electrical impedance vs. frequency spectra.
URI: http://hdl.handle.net/10397/14590
ISSN: 0041-624X
EISSN: 1874-9968
DOI: 10.1016/S0041-624X(02)00378-5
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