Methodology to evaluate variations in piezoelectric constants after aging process

Autor(es)

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

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: Advances in Applied Ceramics; v. 117, n. 4, p. 196-200, 2018.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 12/20731-7 - Caracterização de materiais sólidos por ultrassom
• Beneficiário: Flávio Buiochi
• Modalidade de apoio: Auxílio à Pesquisa - Regular