Electromechanical properties of ultra‐low porous auxetic piezocomposite: from the perspective of Poisson’s ratio

Abstract

In this study, the ultra‐low porous auxetic piezoelectric composite made of lead zirconate titanate (PZT) and hollow polyvinylidine difluoride (PVDF) is first proposed by combining “additive” and “subtractive” approaches. The electromechanical properties of the auxetic piezoelectric composite are investigated by finite element analysis. It is found that the ultra‐low porosity in the composite may lead to great extensibility along with the excellent figures of merit obtained in conventional highly porous piezoelectric ceramics. The small amount of additional PVDF can greatly tune the electromechanical properties of composite and effectively reduce the maximum stress of PZT. To elucidate the role of Poisson’s ratio on the electromechanical properties of piezoelectric materials, the relationship expressions among some electromechanical coefficients are derived. Moreover, the semi‐empirical expression of “longitudinal” compliance coefficients and a simple strategy for predicting some electromechanical coefficients are presented to instruct design and application of the ultra‐low porous auxetic piezoelectric materials.

Sensors Based on Auxetic Materials and Structures: A Review

“…(3) The electromechanical properties of this piezoelectric composite material were more customizable than traditional porous piezoelectric materials. These findings provided some effective guidance for the design and development of new auxetic piezoelectric metamaterials [83]. A piezoelectric energy harvester combining the two key topologies of auxetic and kirigami was also developed.…”

Relation between Structure, Mechanical and Piezoelectric Properties in Cellular Ceramic Auxetic and Honeycomb Structures

“…[ 22 ] Furthermore, Tang et al demonstrated improved piezoelectric properties with an auxetic metamaterial. [ 23,24 ] This is contrary to the fact that the piezoelectric properties are reduced with increasing porosity. It is unclear whether the piezoelectric properties are influenced only by the shape or by the mechanical properties per se.…”

“…[22] Furthermore, Tang et al demonstrated improved piezoelectric properties with an auxetic metamaterial. [23,24] This is contrary to the fact that the DOI: 10.1002/adem.202201387…”