Piezoelectric Coefficients $\user2{e}_{\user2{ij}}^{*}$ and $\user2{d}_{\user2{ij}}^{*}$: Combination of Properties at Specific Microgeometry

Abstract

Piezoelectric coefficients e_ij are used to describe a link between an external mechanical strain and a piezoelectric polarisation caused by the direct piezoelectric effect. The piezoelectric coefficients e_ij are of importance to analyse a link between a mechanical stress and an external electric field at the converse piezoelectric effect. Examples of the piezoelectric sensitivity of composites with various connectivity patterns are discussed in terms of the effective piezoelectric coefficients $e_{ij}^{*}$ and relations between the piezoelectric coefficients $e_{ij}^{*}$ and $d_{ij}^{*}$. Of specific interest are a non-monotonic behaviour of $e_{ij}^{*}$, large values of $| {e_{ij}^{*} } |$ and considerable anisotropy of $e_{3j}^{*}$ as well as their links to the microgeometry and properties of components.