Electromechanical field concentrations near the electrode tip in partially poled multilayer piezo-film actuators

Shindo, Yasuhide; Narita, Fumio; Hirama, Mitsuru

doi:10.1088/0964-1726/18/8/085020

Cited by 11 publications

(5 citation statements)

References 9 publications

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“…The approach described is relatively simple and can be used to predict the piezoelectric properties of any composite structure with contrasting permittivity and/or complex electric field distributions. The microstructural model could be improved by additional polarization directions, rotation of the appropriate piezoelectric tensors [22], the potential influence of mechanical stress on domain switching and anisotropic pore shapes.…”

Section: Discussionmentioning

confidence: 99%

“…For poled cells, the polarization direction also needs to be assigned. Shindo et al [22] have assigned the poled properties to individual cells by rotating the piezoelectric, elastic and dielectric tensors to the new polarization direction. We utilized a simple method that involved reading the electric field direction in x, y and z in each cell.…”

Section: Poling Pzt Cellsmentioning

confidence: 99%

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Microstructural modelling of the polarization and properties of porous ferroelectrics

Lewis

Dent

Stevens

et al. 2011

Smart Mater. Struct.

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Micromechanical models of porous ferroelectric ceramics have often assumed that the material is fully polarised in a particular direction and/or consists of a single isolated pore. In this work the polarisation state in three-dimensional porous polycrystalline ferroelectric networks has been modelled to eradicate the oversimplification of these idealised unit cells. This work reveals that microstructural network models more closely represent a porous ferroelectric microstructure since they are able to take into account the complex polarisation distribution in the material due to the presence of high and low permittivity regions. The modelling approach enables the prediction of the distribution of poled and unpoled material within the structure. The hydrostatic figures of merits and permittivity were determined for a variety of porous lead zirconate titanate microstructures and found to be in good agreement with experimental data. The decrease in piezoelectric activity with porosity was observed to be associated with the complex polarisation state within the material. Model results were shown to be much improved when compared to a model assuming a fully-polarised model.

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Section: Discussionmentioning

confidence: 99%

Section: Poling Pzt Cellsmentioning

confidence: 99%

Microstructural modelling of the polarization and properties of porous ferroelectrics

Lewis

Dent

Stevens

et al. 2011

Smart Mater. Struct.

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“…We assumed that the Curie temperature of the PZT fiber was 127 °C. Hence, the direction of each electric domain in PZT was randomly oriented [ 24 ], and the piezoelectric coefficients were zero above the Curie temperature.…”

Section: Analytical Proceduresmentioning

confidence: 99%

Electromechanical Response and Residual Thermal Stress of Metal-Core Piezoelectric Fiber /Al Matrix Composites

Wang

Yanaseko

Kurita

et al. 2020

Sensors

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It is well known that the curing residual stress induced during a fabrication process has a great influence on the performance of piezoelectric composite devices. The purpose of this work was to evaluate the residual thermal stress of lead zirconate titanate piezoelectric fiber aluminum (Al) matrix (piezoelectric fiber/Al) composites generated during fabrication and to understand the effect of the residual thermal stress on the electromechanical response. The three-dimensional finite element method was employed, and the residual stress generated during the solidification process of the Al matrix was calculated. The output voltage was also calculated in the analysis when putting stresses on the composite materials in the length direction of the piezoelectric fiber. It was shown that the cooling from higher temperatures increases the electromechanical conversion capability. Furthermore, we also performed the simulation, and we recorded the output voltage under concentrated load to investigate its application as a load position detection sensor, and we also discussed the influence of the position by changing the modeling with a different fiber position in the Al. The residual stress of hot press molded piezoelectric fiber/Al composite was then measured, and the comparison was made with the calculated values. The simulation results revealed that our model predictions reproduced and explained the experimental observations of curing residual stress. After this study, similar models of composite materials can be analyzed by this simulation, and the result can be used to design piezoelectric composite materials.

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“…In general, when compressive stress is applied in the polarization direction of piezoelectric ceramics, especially soft piezoelectric ceramics, spontaneous depolarization occurs and the piezoelectric constant decreases [25,26]. Several studies on the application of compressive stress to polarized ceramics have been reported [27][28][29]; however, most of these studies reported the change in piezoelectric properties and polarization under uniaxial compressive stress [30,31]. Few studies have been conducted on the polarization state and the piezoelectric properties under extremely high triaxial stress (about 1 GPa [22,23]), such as the PZT embedded in aluminum.…”

Section: Introductionmentioning

confidence: 99%

Electric polarization and crystal orientation of lead zirconate titanate under mechanical stress due to embedding in a metal matrix

et al. 2021

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The mechanical characteristics of piezoelectric ceramic fibers can be improved by embedding the fibers in a metal matrix. The compressive stress generated during the embedding process, however, limits the polarization of piezoelectric ceramic composites. To study and determine the relationship between the mechanical and piezoelectric properties of piezoelectric ceramics, we analyzed the crystallographic orientation of piezoelectric ceramics embedded in an aluminum matrix via electron backscatter diffraction. The orientation of the crystals before and after the polarization of the piezoelectric fibers, in which residual stresses were generated during embedding, was evaluated. Furthermore, the residual stresses were reduced by heat treatment, and the resultant angle of orientation was evaluated before and after polarization. Results showed that, as the residual stresses were relieved, the orientation of the piezoelectric ceramic crystals changed to reveal increased polarization. Our analysis shows that the crystal orientation of piezoelectric ceramics is impacted by the residual compressive stress that arises from embedding the piezoelectric fiber in the aluminum matrix; it also illustrates the hindering effect of residual stress on the polarization of piezoelectric ceramics.

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Electromechanical field concentrations near the electrode tip in partially poled multilayer piezo-film actuators

Cited by 11 publications

References 9 publications

Microstructural modelling of the polarization and properties of porous ferroelectrics

Microstructural modelling of the polarization and properties of porous ferroelectrics

Electromechanical Response and Residual Thermal Stress of Metal-Core Piezoelectric Fiber /Al Matrix Composites

Electric polarization and crystal orientation of lead zirconate titanate under mechanical stress due to embedding in a metal matrix

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