DocumentCode :
1358362
Title :
Characterization of the mechanical nonlinear behavior of piezoelectric ceramics
Author :
Albareda, Alfons ; Gonnard, Paul ; Perrin, Véronique ; Briot, Roland ; Guyomar, Daniel
Author_Institution :
Dept. de Fisica Aplicada, Univ. Politecnica de Catalunya, Barcelona, Spain
Volume :
47
Issue :
4
fYear :
2000
fDate :
7/1/2000 12:00:00 AM
Firstpage :
844
Lastpage :
853
Abstract :
A characterization of the nonlinear behavior with high signal excitation in piezoceramic resonators was carried out. The behavior of power devices working at resonance, in which high strains are involved, is explained. A theoretical model previously described is used to explain the motional impedance variation proportional to the square of the motional current. This impedance increase /spl Delta/Z is independent of the frequency and explains: the nonlinear elasticity that produces the A-F effect, the nonlinear mechanical losses that increase greatly close to the resonance, and the hysteresis phenomenon produced with frequency sweeps. Different methods for measuring the mechanical nonlinear coefficients of piezoceramics with high signal excitation are presented. An experimental method is proposed to measure the mechanical loss tangent and the compliance variations as a function of the mean square strain in the piezoceramic. This consists in measuring the maximum admittance and the series resonance frequency for downward frequencies. At this jumping point, the phase angle remains zero whatever the amplitude of the excitation. Two main coefficients characterizing the material mechanical nonlinearity are deduced. Experimental measurements were carried out to compare the nonlinearity of different ceramic materials in longitudinal and transverse mode.
Keywords :
crystal resonators; dielectric hysteresis; elasticity; electric impedance; losses; piezoceramics; characterization; compliance variations; downward frequencies; frequency sweeps; high signal excitation; high strains; hysteresis phenomenon; longitudinal mode; maximum admittance; mean square strain; mechanical loss tangent; mechanical nonlinear behavior; motional current; motional impedance variation; nonlinear elasticity; nonlinear mechanical losses; phase angle; piezoceramic resonators; piezoceramics; piezoelectric ceramics; power devices; series resonance frequency; theoretical model; transverse mode; Capacitive sensors; Elasticity; Frequency; Hysteresis; Impedance; Loss measurement; Mechanical variables measurement; Piezoelectric materials; Resonance; Strain measurement;
fLanguage :
English
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-3010
Type :
jour
DOI :
10.1109/58.852066
Filename :
852066
Link To Document :
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