Experimental Measurements on Dynamic Characteristics of Piezoceramic Plates with Cracks
Date Issued
2004
Date
2004
Author(s)
Huang, Chih-Lin
DOI
zh-TW
Abstract
Because piezoelectric material is a brittle material and usually be driven by high frequency and voltage, cracks are easily found in piezoceramic material. These cracks will result in stress concentration and the safety and reliability of the materials will become a problem. Moreover, the existence of cracks will change the shape of electrodes and the dynamic characteristics of the piezoceramic plates will be influenced. Hence the problem of piezoceramic plates with cracks is complicated because it combines the fields of vibration analysis, electricity and fracture mechanics.
In this thesis, three experimental techniques, AF-ESPI, LDV and impedance analyzer are used to obtain the vibration characteristics of piezoceramic plates and the experimental results are verified by FEM simulation. The dynamic characteristics of piezoceramic plates without crack, with one center crack and two cracks are investigated in detail. It is shown that the theoretical predictions by the finite element method and the experimental results agree fairly well for the resonant frequencies and mode shapes. Besides, in order to understand the influence of electrode on the vibration properties, we also analyze dynamic characteristics of the piezoceramic plates with special design of electrodes. Finally, the relationship between temperature and vibration characteristics of piezoceramic plates is established base on experimental measurement.
Subjects
裂縫
壓電陶瓷
Piezoceramic
Crack
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-93-R92522502-1.pdf
Size
23.53 KB
Format
Adobe PDF
Checksum
(MD5):b6675412e4ebadf9f95102f461ce9198