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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Modeling of functionally graded piezoelectric ultrasonic transducers

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Rubio, Wilfredo Montealegre [1] ; Buiochi, Flavio [1] ; Adamowski, Julio Cezar [1] ; Nelli Silva, Emilio Carlos [1]
Total Authors: 4
[1] Univ Sao Paulo, Escola Politecn, Dept Mechatron & Mech Syst Engn, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: ULTRASONICS; v. 49, n. 4-5, p. 484-494, MAY 2009.
Web of Science Citations: 12

The application of functionally graded material (FGM) concept to piezoelectric transducers allows the design of composite transducers without interfaces, due to the continuous change of property values. Thus, large improvements can be achieved, as reduction of stress concentration, increasing of bonding strength, and bandwidth. This work proposes to design and to model FGM piezoelectric transducers and to compare their performance with non-FGM ones. Analytical and finite element (FE) modeling of FGM piezoelectric transducers radiating a plane pressure wave in fluid medium are developed and their results are compared. The ANSYS software is used for the FE modeling. The analytical model is based on FGM-equivalent acoustic transmission-line model, which is implemented using MATLAB software. Two cases are considered: (i) the transducer emits a pressure wave in water and it is composed of a graded piezoceramic disk, and backing and matching layers made of homogeneous materials; (ii) the transducer has no backing and matching layer; in this case, no external load is simulated. Time and frequency pressure responses are obtained through a transient analysis. The material properties are graded along thickness direction. Linear and exponential gradation functions are implemented to illustrate the influence of gradation on the transducer pressure response, electrical impedance, and resonance frequencies. (C) 2009 Elsevier B. V. All rights reserved. (AU)

FAPESP's process: 05/01762-5 - Design of piezoelectric transducers and MEMS based on functionally graded material concepts and topological optimization
Grantee:Wilfredo Montealegre Rubio
Support Opportunities: Scholarships in Brazil - Doctorate