Hostname: page-component-cd9895bd7-jkksz Total loading time: 0 Render date: 2024-12-25T16:42:50.009Z Has data issue: false hasContentIssue false

Nonlinear characterization of resonant piezocomposites1-3 for NDT ultrasonic transducers*

Published online by Cambridge University Press:  15 July 2000

J. A. Casals
Affiliation:
Dept. Física Aplicada Univ. Politécnica Catalunya, Ed. B4, Campus Nord, c/ Jordi Girona 1-3, 08034 Barcelona, Spain
A. Albareda*
Affiliation:
Dept. Física Aplicada Univ. Politécnica Catalunya, Ed. B4, Campus Nord, c/ Jordi Girona 1-3, 08034 Barcelona, Spain
R. Pérez
Affiliation:
Dept. Física Aplicada Univ. Politécnica Catalunya, Ed. B4, Campus Nord, c/ Jordi Girona 1-3, 08034 Barcelona, Spain
J. H. Kayombo
Affiliation:
Dept. Física Aplicada Univ. Politécnica Catalunya, Ed. B4, Campus Nord, c/ Jordi Girona 1-3, 08034 Barcelona, Spain
E. Minguella
Affiliation:
Dept. Física Aplicada Univ. Politécnica Catalunya, Ed. B4, Campus Nord, c/ Jordi Girona 1-3, 08034 Barcelona, Spain
F. Montero de Espinosa
Affiliation:
Inst. Acústica, CSIC, c/ Serrano 144, 28006 Madrid, Spain
Get access

Abstract

A comparative nonlinear characterization is carried out between the nonlinear behavior of a composite and the piezoceramic used to obtain it. This study is necessary for using the composite in power transducer applications, as in the Non Destructive Testing (NDT) by ultrasonic waves at high frequencies (300 kHz−800 kHz). Measurements of the losses and the resonator stiffness variations have also been done. Both these effects, as well as the possibility of the frequency hysteresis, show different behavior in the composites, since the increases in the ceramics are different from those in the composites. In this study two measure methods are used; principally the motional impedance increase with the motional current measurements. The results obtained are normalized in order to make them independent of the resonator size, and thus make the comparison between the composite and the ceramic easier. The figure of the mechanical loss tangent tg $\delta_{\rm m}$versus the mean strain $\langle S \rangle $ shows that the losses can be greater in the ceramic than in the composite for soft ceramics. The dependence behavior of the losses versus the mean strain shows that hard composite transducers have lower losses and higher strains than the soft ones. However, these losses in hard composites are higher than those in the bulk ceramic transducers.

Keywords

Type
Research Article
Copyright
© EDP Sciences, 2000

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Footnotes

*

This work has been presented at the 3rd SEE meeting (16-17 September 1999. INSA-Lyon, France)

References

Gómez Álverez-Arenas, T.E., Montero de, F.R. Espinosa, IEEE Trans. UFFC 44, 208 (1997). CrossRef
Rodríguez, F., Gómez, T., Montero de, F. Espinosa, Bol. Soc. Esp. Cerámica y Vidrio 37, 184 (1998).
Sánchez, S., Montero de, F.R. Espinosa, N. Lamberti, Ultrasonics 37, 97 (1999). CrossRef
Pérez, R., Albareda, A., J. Acous. Soc. Am. 100, 3561 (1996). CrossRef
Albareda, A., Pérez, R., Villar, J.L., Minguella, E., Gorri, J.A., Rev. Sci. Instrum. 68, 3143 (1997). CrossRef
P. Gonnard, V. Perrin, R. Briot, D. Guyomar, A. Albareda, Characterization of the Piezoelectric Ceramic Mechanical Nonlinear Behavior, Proc. of IEEE, ISAF'98, 1998.