Methodology to evaluate variations in piezoelectric constants after aging process

Author(s)

del Castillo, Mariana ^[1] ; Buiochi, Flavio ^[2] ; Perez, Nicolas ^[1]

Affiliation

^[1] Univ Republica, Inst Ingn Elect, Fac Ingn, Julio Herrera y Reissig 565, Montevideo 11200 - Uruguay

^[2] Univ Sao Paulo, Dept Engn Mecatron, Sao Paulo - Brazil

• Document type: Journal article
• Source: Advances in Applied Ceramics; v. 117, n. 4, p. 196-200, 2018.
• Web of Science Citations: 0

Abstract

Piezoelectric ceramic properties change with time. Detected aging effects for PZT ceramics are; the difference in the value of the dielectric constants diminishes, whereas dielectric losses and elastic stiffness increases. In this work, an optimisation technique based on adjusting a finite element model to reproduce the complex impedance curves of a resonant piezoceramic disk is analysed aiming to detect changes due to aging. This technique allows estimating all material parameters, both their real and imaginary parts. The optimisation uses the constitutive equations of the piezoelectric effect in the linear regime. The evolution of elastic, piezoelectric and dielectric constants is evaluated after 5 years of aging. To compute the ten complex parameters, the piezoelectric model is adjusted to minimise the difference between finite element simulations and the experimental data. Results presented here, show that the proposed technique is sensitive enough to detect changes in the individual parameters due to aging process. (AU)

• FAPESP's process: 12/20731-7 - Ultrasonic characterization of solid materials
• Grantee: Flávio Buiochi
• Support Opportunities: Regular Research Grants