研究目的
Investigating the electromechanical properties of 3-3 piezoelectric metamaterial based on variants of honeycomb (HC) structure for hydrophones applications.
研究成果
The study concludes that the 3-3 piezoelectric cellular metamaterials based on variants of honeycomb structure exhibit enhanced electromechanical properties, especially for the longitudinal poling. The normalized figures of merit show a mild dependence on the angle θ and the underlying deformation mechanisms associated with the zero, positive and negative Poisson’s ratios. The longitudinally poled networks exhibited four order of magnitude increase in their hydrostatic figure of merit and one order of magnitude decrease in the acoustic impedance, indicating their applicability for the design of hydrophones. The novel 3D-RE and 3D-SRE auxetic functional HC networks have the potential to design unique devices for sensing or actuating applications with negative and zero Poisson’s ratio.
研究不足
The study assumes uniform poling in a specific direction for all regions in the piezoelectric cellular material, which may not be practically feasible due to the presence of complex pore shape during the processing of poling leading to an inhomogeneous electric field distribution throughout the cellular structure. Some regions may remain un-poled or be poled in a direction that is different from the direction that is originally intended in the poling process.
1：Experimental Design and Method Selection:
Developed highly porous 3D finite element models of three kinds of metamaterials (3D-CHC, 3D-RE, 3D-SRE) to characterize the role of ligament orientation on their effective elastic, piezoelectric and dielectric properties. Utilized the intrinsic symmetry of HC structure and recognized simplified mixed boundary conditions equivalent to periodic boundary conditions.
2：Sample Selection and Data Sources:
Used PZT-5H as the base material for the ligaments of cellular solids. Two poling directions were considered: longitudinal (aligned with the axis of porosity) and transverse (perpendicular to the axis of porosity).
3：List of Experimental Equipment and Materials:
Commercial finite element analysis software ABAQUS? was used. Each ligament of the unit cell was meshed with 10-noded quadratic piezo-electric tetrahedron elements (C3D10E).
4：Experimental Procedures and Operational Workflow:
Applied mechanical and electrical loading conditions to the unit cells as per the load cases to obtain the effective electromechanical properties. The boundary conditions were applied such that except one component of the effective stress and electric field vector, all the remaining components would yield zero values.
5：Data Analysis Methods:
The homogenization process was used to yield effective properties for different macroscopic loading cases. The average stress and strain were obtained by volume integration over the unit cell.
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