Properties of piezoceramic materials in high electric field actuator applications

Bruno, Binal Poyyathuruthy; Fahmy, Ahmed Raouf; Stürmer, Moritz; Wallrabe, Ulrike; Wapler, Matthias C.

doi:10.1088/1361-665x/aae8fb

Cited by 38 publications

(37 citation statements)

References 29 publications

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“…The time-dependent study was selected in the simulation as the velocities, which are used in the moving mesh module, are time-dependent values, and as the stationary study does not compute these instantaneous velocities. In the study, the time range was selected from 0 s to 1 s with a step of 0.1 s. The applied voltages were limited to 140 V in positive polarization direction, and −40 V in negative polarization direction to avoid piezo saturation and re-polarization [19]. A sinusoidal voltage within the voltage limits was defined using a piecewise function under global definitions.…”

Section: Resultsmentioning

confidence: 99%

Simulation of an Adaptive Fluid-Membrane Piezoelectric Lens

Gowda

Wallrabe

2019

Micromachines

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In this paper, we present a finite-element simulation of an adaptive piezoelectric fluid-membrane lens for which we modelled the fluid-structure interaction and resulting membrane deformation in COMSOL Multiphysics®. Our model shows the explicit coupling of the piezoelectric physics with the fluid dynamics physics to simulate the interaction between the piezoelectric and the fluid forces that contribute to the deformation of a flexible membrane in the adaptive lens. Furthermore, the simulation model is extended to describe the membrane deformation by additional fluid forces from the fluid thermal expansion. Subsequently, the simulation model is used to study the refractive power of the adaptive lens as a function of internal fluid pressure and analyze the effect of the fluid thermal expansion on the refractive power. Finally, the simulation results of the refractive power are compared to the experimental results at different actuation levels and temperatures validating the coupled COMSOL model very well. This is explicitly proven by explaining an observed positive drift of the refractive power at higher temperatures.

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Section: Resultsmentioning

confidence: 99%

Simulation of an Adaptive Fluid-Membrane Piezoelectric Lens

Gowda

Wallrabe

2019

Micromachines

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“…Because of the non-linearity of the piezoelectric charge coefficient d 31 and the hysteresis and creep effects, we did not simply use a constant d 31 , but we needed to determine the charge coefficient as a function of the applied voltage and its voltage history. For this reason, we followed the established strategy of [32] and manufactured a simple mono-morph bending beam with one 100 µm thick passive glass layer and one Ekulit piezo layer that we could simulate reliably. We applied the same electric fields as for the lens measurements (see section 5) to this beam, measured the beam curvature and compared it to the simulation as done in [32].…”

Section: Piezoelectric Non-linearitymentioning

confidence: 99%

“…As a piezo material, we detach the piezo sheets from Ekulit sound buzzers with the mentioned small thickness of t = 105 µm to achieve high focal powers referring to equation (4). They in fact showed better performance with a high piezoelectric coefficient of d 31 ≈ −487 pm V [32] for high electric fields and a better surface quality than many readily available raw piezo foils. We used this value for all analytical calculations but need to be aware that for small electric fields, the piezoelectric coefficient is reduced by up to 40 % [32] resulting in overestimated focal powers in the bending mode.…”

Section: Fabricationmentioning

confidence: 99%

“…They in fact showed better performance with a high piezoelectric coefficient of d 31 ≈ −487 pm V [32] for high electric fields and a better surface quality than many readily available raw piezo foils. We used this value for all analytical calculations but need to be aware that for small electric fields, the piezoelectric coefficient is reduced by up to 40 % [32] resulting in overestimated focal powers in the bending mode. We structure the piezo rings and the 30, 50 and 70 µm thick glass membrane with an UV laser.…”

Section: Fabricationmentioning

confidence: 99%

“…We limited the electric field against the polarization to −0.38 kV mm , i.e., less than half of the negative coercive field strength of 0.78 kV mm [32]. We similarly set a maximum electric field of 1.43 kV mm to avoid electrostatic breakdown.…”

Section: Characterization Of Focal Power and Aspherical Behaviormentioning

confidence: 99%

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Multiphysics simulation of the aspherical deformation of piezo-glass membrane lenses including hysteresis, fabrication and nonlinear effects

Lemke

Frey

Bruno

et al. 2019

Smart Mater. Struct.

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In this paper we present and verify the non-linear simulation of an aspherical adaptive lens based on a piezo-glass sandwich membrane with combined bending and buckling actuation. To predict the full non-linear piezoelectric behavior, we measured the non-linear charge coefficient, hysteresis and creep effects of the piezo material and inserted them into the FEM model using a virtual electric field. We further included and discussed the fabrication parameters -glue layers and thermal stress -and their variations. To verify our simulations, we fabricated and measured a set of lenses with different geometries, where we found good agreement and show that their qualitative behavior is also well described by a simple analytical model. We finally discuss the effects of the geometry on the electric response and find, e.g., an increased focal power range from ±4.5 to ±9 m −1 when changing the aperture from 14 to 10 mm.

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Dielectric‐Based Metamaterials for Near‐Perfect Light Absorption

Wang,

Qin,

Duan

et al. 2024

Adv Funct Materials

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The emergence of metamaterials and their continued prosperity have built a powerful working platform for accurately manipulating the behavior of electromagnetic waves, providing sufficient possibility for the realization of metamaterial absorbers with outstanding performance. However, metamaterial absorbers composed of metallic materials typically possess many unfavorable factors, such as non‐adjustable absorption, easy oxidation, low‐melting, and expensive preparation costs. The selection of dielectric materials provides excellent alternatives due to their remarkable properties, thus dielectric‐based metamaterial absorbers (DBMAs) have attracted much attention. To promote breakthroughs in DBMAs and guide their future development, this work systematically and deeply reviews the recent research progress of DBMAs from four different but progressive aspects, including physical principles; classifications, material selections and tunable properties; preparation technologies; and functional applications. Five different types of theories and related physical mechanisms, such as Mie resonance, guided‐mode resonance, and Anapole resonance, are briefly outlined to explain DBMAs having near‐perfect absorption performance. Mainstream material selections, structure designs, and different types of tunable DBMAs are highlighted. Several widely utilized preparation methods for customizing DBMAs are given. Various practical applications of DBMAs in sensing, stealth technology, solar energy absorption, and electromagnetic interference suppression are reviewed. Finally, some key challenges and feasible solutions for DBMAs’ future development are provided.

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Properties of piezoceramic materials in high electric field actuator applications

Cited by 38 publications

References 29 publications

Simulation of an Adaptive Fluid-Membrane Piezoelectric Lens

Simulation of an Adaptive Fluid-Membrane Piezoelectric Lens

Multiphysics simulation of the aspherical deformation of piezo-glass membrane lenses including hysteresis, fabrication and nonlinear effects

Dielectric‐Based Metamaterials for Near‐Perfect Light Absorption

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