Effective properties of piezoceramics with metal inclusions: numerical analysis

Abstract

The paper considers the problem of determining the effective properties of piezoceramics with metal inclusions. The homogenization problem was numerically solved in the representative volume with closed structure of inclusions. The effective moduli behavior was analyzed depending on the fraction of inclusions for piezoceramic PZT-5A with platinum inclusions. An increase in the effective stiffness moduli, the longitudinal and shear piezoelectric stress coefficients, and a considerable increase in the dielectric permittivities were discovered with the growth of the metal inclusions fraction. The effective dielectric permittivities grew for the same fraction of inclusions when the relative size of inclusions increased.

Keywords:

• piezoelectric composite
• piezoceramics
• metal inclusion
• giant dielectric constant
• effective moduli
• finite element method
• microstructure
• representative volume

Additional information

Funding

The work was supported by the Russian Foundation for Basic Research, project No. 16-58-48009-Ind-omi and the Government of the Russian Federation, contract No. 075-15-2019-1928.