scholarly journals Characterization of 1-3 Piezoelectric Composite with a 3-Tier Polymer Structure

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 397 ◽  
Author(s):  
Ruiqing Sun ◽  
Likun Wang ◽  
Yanjun Zhang ◽  
Chao Zhong
Keyword(s):  
Electromechanical Coupling ◽  
Characteristic Impedance ◽  
Middle Layer ◽  
Electromechanical Coupling Factor ◽  
Polymer Structure ◽  
Coupling Factor ◽  
Piezoelectric Composite ◽  
The Finite Element Method ◽  
Effective Parameters

In order to boost the electromechanical coupling factor and decrease the characteristic impedance, a 1-3 piezoelectric composite with a 3-tier polymer structure was designed and fabricated, in which epoxy resin constitutes the middle layer and silicone rubber is used to clamp the epoxy. The effective parameters of the composite, such as resonant frequency, electromechanical coupling factor, and characteristic impedance, were studied by the finite element method and experiment. The experimental results indicate that the electromechanical coupling factor of the composite is enhanced by 8.4% and the characteristic impedance is decreased by 52.8%, compared with the traditional 1-3 ceramic/epoxy composite.

Piezoelectric Shear Mode Inkjet Actuator

2001 ◽  
Vol 687 ◽  
Author(s):  
Jürgen Brünahl ◽  
Alex M. Grishin ◽  
Sergey I. Khartsev ◽  
Carl Österberg
Keyword(s):  
Electromechanical Coupling ◽  
Microelectromechanical Systems ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Shear Mode ◽  
Drop On Demand ◽  
Ink Jet ◽  
Ferroelectric Hysteresis ◽  
Comprehensive Characterization

AbstractWe report on comprehensive characterization of piezoelectric shear mode inkjet actuators micromachined into bulk Pb(Zr0.53Ti0.47)O3 (PZT) ceramics. The paper starts with an overview of different inkjet technologies such as continuous jet and drop-on-demand systems, whereat main attention is turned on piezoelectric systems particularly Xaar-type shear mode inkjet color printheads. They are an example of complex microelectromechanical systems (MEMS) and comprise a ferroelectric array of 128 active ink channels (75νm wide and 360νm deep). Detailed information about manufacturing and principles of operation are given. Several techniques to control manufacturing processes and to characterize properties of the piezoelectric material are described: dielectric spectroscopy to measure dielectric permittivity ε and loss tanσ; ferroelectric hysteresis P-E loop tracing to get remnant polarization Pr and coercive field Ec, and a novel pulsed technique to quantify functional properties of the PZT actuator such as acoustic resonant frequencies and electromechanical coupling factor. Stroboscope technique has been employed to find correlation between the degradation of ink-jet performance and heat/high voltage treatment resulting in ferroelectric fatigue.

Characterization of an Improved 1-3 Piezoelectric Composite by Simulation and Experiment

2017 ◽  
Vol 15 (1_suppl) ◽  
pp. 38-44 ◽  
Author(s):  
Chao Zhong ◽  
Likun Wang ◽  
Lei Qin ◽  
Yanjun Zhang
Keyword(s):  
Finite Element ◽  
Epoxy Resin ◽  
Silicone Rubber ◽  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
External Stress ◽  
Piezoelectric Composite ◽  
Bending Deformation ◽  
Simulation And Experiment

Introduction To increase electromechanical coupling factor of 1-3 piezoelectric composite and reduce its bending deformation under external stress, an improved 1-3 piezoelectric composite is developed. In the improved structure, both epoxy resin and silicone rubber are used as polymer material. Methods The simulation model of the improved 1-3 piezoelectric composite was established using the finite element software ANSYS. The relationship of the performance of the improved composite to the volume percentage of silicone rubber was determined by harmonic response analysis and the bending deformation under external stress was simulated by static analysis. The improved composite samples were prepared by cutting and filling methods, and the performance was tested. Results The feasibility of the improved structure was verified by finite element simulation and experiment. The electromechanical coupling factor of the improved composite can reach 0.67 and meanwhile the characteristic impedance can decline to 13 MRayl. The electromechanical coupling factor of the improved composite is higher than that of the composite with only epoxy resin as the polymer and the improved composite can reduce bending deformation. Discussion Comparison of simulation and experiment, the results of the experiment are in general agreement with those from the simulation. However, most experimental values were higher than the simulation results, and the abnormality of the test results was also more obvious than that of the simulation. These findings may be attributed to slight difference in the material parameters of simulation and experiment.

scholarly journals Wave Electromechanical Coupling Factor for the Guided Waves in Piezoelectric Composites

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1406 ◽  
Author(s):  
Yu Fan ◽  
Manuel Collet ◽  
Mohamed Ichchou ◽  
Olivier Bareille ◽  
Lin Li
Keyword(s):  
Guided Waves ◽  
Vibration Isolation ◽  
Electromechanical Coupling ◽  
Transmission Loss ◽  
Electric Energy ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Reduced Model ◽  
Piezoelectric Composite ◽  
Piezoelectric Composites

A novel metrics termed the ‘wave electromechanical coupling factor’ (WEMCF) is proposed in this paper, to quantify the coupling strength between the mechanical and electric fields during the passage of a wave in piezoelectric composites. Two definitions of WEMCF are proposed, leading to a frequency formula and two energy formulas for the calculation of such a factor. The frequency formula is naturally consistent with the conventional modal electromechanical coupling factor (MEMCF) but the implementation is difficult. The energy formulas do not need the complicated wave matching required in the frequency formula, therefore are suitable for computing. We demonstrated that the WEMCF based on the energy formula is consistent with the MEMCF, provided that an appropriate indicator is chosen for the electric energy. In this way, both the theoretical closure and the computational feasibility are achieved. A numerical tool based on the wave and finite element method (WFEM) is developed to implement the energy formulas, and it allows the calculation of WEMCF for complex one-dimensional piezoelectric composites. A reduced model is proposed to accelerate the computing of the wave modes and the energies. The analytical findings and the reduced model are numerically validated against two piezoelectric composites with different complexity. Eventually an application is given, concerning the use of the shunted piezoelectric composite for vibration isolation. A strong correlation among the WEMCF, the geometric parameters and the energy transmission loss are observed. These results confirm that the proposed WEMCF captures the physics of the electromechanical coupling phenomenon associated with the guided waves, and can be used to understand, evaluate and design the piezoelectric composites for a variety of applications.

Effect of Shape Parameter on the Performance of 1-3 Piezoelectric Composites

2011 ◽  
Vol 306-307 ◽  
pp. 301-304
Author(s):  
Min Sun ◽  
Hua Wang ◽  
Shi Feng Huang ◽  
Xin Cheng
Keyword(s):  
Electromechanical Coupling ◽  
Shape Parameter ◽  
Volume Fraction ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Cross Sectional Area ◽  
Piezoelectric Composite ◽  
Sectional Area ◽  
Cross Sectional ◽  
Piezoelectric Composites

1-3 polymer-based piezoelectric composites were fabricated using epoxy as matrix by the cut-filling method. The influences of shape parameter on properties of the piezoelectric composite, which include the unit cross-sectional area and the aspect ratio w/t were analyzed. The results indicate that with the increasing of the unit cross-sectional area, the quality factor valueQmincreases and the hydrostatic piezoelectric voltageghincreases and then goes down rapidly while the PMN volume fractionφ(PMN) is kept under the 50%. When theφ(PMN) is 60%,ghis decreased. The trend of the hydrostatic figures of meritdh·ghis similar withghas the change of the unit cross-sectional area, but the value is different. In the 60% PMN volume fraction, the optimal value of thedh·ghis chosen. With the increasing of thew/t, the hydrostatic pressure sensitivityMh, thedh·ghvalues and theQmvalues are all decreased rapidly, and the thickness electromechanical coupling factorktis increased. In other words, the test results show that the smaller of unit cross-sectional area and thinner of thickness, the more helpful for frequency bandwidth and sensitivity when it is used in transducer.

Syntheisis and Characterization of Bismuth Tungstate Crystals by Solution Growth Technique

2007 ◽  
Vol 350 ◽  
pp. 81-84
Author(s):  
Masaya Nishida ◽  
Hiroaki Takeda ◽  
Takashi Nishida ◽  
Tadashi Shiosaki
Keyword(s):  
Electromechanical Coupling ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Dielectric Constants ◽  
Slow Cooling ◽  
Growth Technique ◽  
Polarization Axis ◽  
Vertical Bridgman ◽  
Different Shapes

Growth of ferroelectric Bi2WO6 (BWO) mono-domain bulk crystals was attempted by the vertical-Bridgman (VB) method below the phase transition (ferro- to paraelectric) temperature of 940oC using Li2B4O7 as a flux. In this method, Pt crucibles with different shapes were used. The crucible with a wedged tip bottom produced BWO crystal with a thickness of over 4 mm along the crystallographic c-axis (perpendicular to the spontaneous polarization axis). Using BWO mono-domain crystals grown by slow cooling technique, on the other hand, their electric properties were characterized. The dielectric constants, ε ij, and electromechanical coupling factor, k33, of the crystals were 70-100 and 36% at room temperature, respectively.

scholarly journals Design and Analysis of a Novel Piezoceramic Stack-based Smart Aggregate

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6438
Author(s):  
Guangtao Lu ◽  
Xin Zhu ◽  
Tao Wang ◽  
Zhiqiang Hao ◽  
Bohai Tan
Keyword(s):  
Resonance Frequency ◽  
Electromechanical Coupling ◽  
Structural Parameters ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Stress Waves ◽  
Parallel Connection ◽  
Smart Aggregate ◽  
In Series ◽  
Piezoelectric Wafers

A novel piezoceramic stack-based smart aggregate (PiSSA) with piezoceramic wafers in series or parallel connection is developed to increase the efficiency and output performance over the conventional smart aggregate with only one piezoelectric patch. Due to the improvement, PiSSA is suitable for situations where the stress waves easily attenuate. In PiSSA, the piezoelectric wafers are electrically connected in series or parallel, and three types of piezoelectric wafers with different electrode patterns are designed for easy connection. Based on the theory of piezo-elasticity, a simplified one-dimensional model is derived to study the electromechanical, transmitting and sensing performance of PiSSAs with the wafers in series and parallel connection, and the model was verified by experiments. The theoretical results reveal that the first resonance frequency of PiSSAs in series and parallel decreases as the number or thickness of the PZT wafers increases, and the first electromechanical coupling factor increases firstly and then decrease gradually as the number or thickness increases. The results also show that both the first resonance frequency and the first electromechanical coupling factor of PiSSA in series and parallel change no more than 0.87% as the Young’s modulus of the epoxy increases from 0.5 to 1.5 times 3.2 GPa, which is helpful for the fabrication of PiSSAs. In addition, the displacement output of PiSSAs in parallel is about 2.18–22.49 times that in series at 1–50 kHz, while the voltage output of PiSSAs in parallel is much less than that in parallel, which indicates that PiSSA in parallel is much more suitable for working as an actuator to excite stress waves and PiSSA in series is suitable for working as a sensor to detect the waves. All the results demonstrate that the connecting type, number and thickness of the PZT wafers should be carefully selected to increase the efficiency and output of PiSSA actuators and sensors. This study contributes to providing a method to investigate the characteristics and optimize the structural parameters of the proposed PiSSAs.

Relaxor Single Crystals with Giant k31 Mode

2006 ◽  
Vol 45 ◽  
pp. 2412-2421
Author(s):  
Toshio Ogawa
Keyword(s):  
Single Crystal ◽  
Electromechanical Coupling ◽  
Impedance Measurement ◽  
Hysteresis Loops ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Poling Direction ◽  
Length Direction ◽  
Relaxor Single Crystals ◽  
The Relationship

Giant electromechanical coupling factor of k31 mode over 86% was found for (100) Pb[(Zn1/3Nb2/3)0.91Ti0.09]O3 and (110) Pb[(Mg1/3Nb2/3)0.74Ti0.26]O3 single-crystal plates poled in the [100] and [110] directions, respectively. The P-E hysteresis loops in the single-crystal plates with giant k31 became asymmetric. Furthermore, the frequency response of impedance in these plates with giant k31 consisted of a single vibration in the length direction. A mechanism to realize giant k31 can be explained by the relationship between the crystal plane and poling direction. In addition, the existence of giant piezoelectric d31 constant was proven by the strain measurement as well as by the impedance measurement.

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