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A Novel Strategy to Fabricate Core-Sheath Structure piezoelectric Yarns for Wearable Energy Harvesters

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Advanced Fiber materials 2021年第4期3卷 239-250页

作者： Lili Xue Wei Fan Yang Yu Kai Dong Chengkun Liu Yanli Sun Cong Zhang Weichun Chen Ruixin Lei Kai Rong Qi Wang School of Textile Science and Engineering Xi’an Polytechnic UniversityXi’an 710048ShaanxiChina State key laboratory of Intelligent Textile Material and Products Xi’an Polytechnic UniversityXi’an 710048ShaanxiChina Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China

Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and ***,yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable *** work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding *** fineness of single yarns as well as strength are both improved significantly compared to previous *** piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz,and the cycle stability can maintain more than 3200 ***,the piezoelectric yarns are further woven into piezoelectric plain *** to the electrical performance,the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical *** yarn of the 10 cm in length and 600μm in fineness can produce an output voltage of 120 ***,Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement,such as bending,***,the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly,and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements,which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics.

关键词： Electrospinning 2D braiding technology piezoelectric yarns Energy harvester

THE INTERNAL CRACK IN piezoelectricPIEZOMAGNETIC SANDWICHED STRUCTURE UNDER IN-PLANE COUPLE LOADING

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THE INTERNAL CRACK IN PIEZOELECTRICPIEZOMAGNETIC SANDWICHED ...

FRACTURE MECHANICS OF piezoelectric/ferroELECTRIC materials

2016年全国压电和声波理论及器件应用研讨会

作者： Xing ZHAO Jin-xi LIU Zheng-hua QIAN Department of Engineering Mechanics/The key laboratory for Health Monitoring and Control of Large Structures Shijiazhuang Tiedao University State key laboratory of Mechanics and Control of Mechanical Structures/College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics

Background, Motivation and Objective The piezoelectric-piezomagnetic(PE-PM) sandwiched structures are consisted of layered piezoelectric and piezomagnetic materials. They are easy to be manufactured and possess superior magnetoelectric(ME) coupling effect. With these superiorities, the PE-PM sandwiched structures have been widely used in sensors, transducers and acoustic wave devices and so on. However, due to the fragility of the materials and complicated in-service loading conditions, the PE-PM sandwiched structures tend to fracture easily. So, it is essential to research the internal crack in PE-PM sandwiched structures under electro-magneto-mechanical coupled loadings. However, up until now, there is no paper studies the mode-I crack in PE-PM-PE sandwiched structure under in-plane electro-mechanical coupled loading. From the above, considering the magnetic field of piezoelectric material and the electric field of piezomagnetic material, a mode-I internal crack problem of a PM layer bonded to two PE layers is studied in this paper. Statement of Contribution/Methods This paper contributes to obtaining an analytical solution by using the integral transform technique. Firstly, the Fourier transforms are applied to the governing equations, and a set of appropriate solutions are obtained with some unknown functions. Then, substituting the appropriate solutions into boundary conditions meanwhile considering the magnetoelectric permeable crack plane conditions, we could derive the dual integral equations after the complex mathematical process. In order to obtain the magneto-electro-elastic field in the near of the crack tip, the dual integral equations are reduced into the singular integral equations with Cauchy kernel of the second kind. Finally, the Cauchy singular integral equations will be solved by Gauss-Jacobi collocation method. Meanwhile, the field intensity factors(FIFs) could be obtained. Results In this paper, an integral transform technique is employed to re

关键词： Mode I crack piezoelectric-piezomagnetic sandwiched structure Field intensity factors Cauchy singular integral equation

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FRACTURE MECHANICS OF PIEZOELECTRIC/FERROELECTRIC MATERIALS

Abnormal phase transition and polarization mismatch phenomena in BaTiO_(3)-based relaxor ferroelectrics

2016年全国压电和声波理论及器件应用研讨会

作者： Qun LI State key laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Xi’an Jiaotong University

Background, Motivation and Objective piezoelectric/ferroelectric ceramics are brittle and susceptible to cracking at all scales ranging from electric domain to devices, due to the inhomogeneous electro-mechanical fields induced by domain switching near the crack tip. Therefore, capturing nonlinear constitutive behavior based on micromechanical modeling of domain switching is inevitable to analyze fracture behavior in ferroelectric materials. This paper is devoted to report on the fracture behavior and domain structure evolution induced by the applied electric fields which are considered to be perpendicular to the crack surfaces. The electromechanical fracture behavior of ferroelectrics is evaluated by the concept of configurational forces. Besides, the birefringence experiments are conducted to observe the variation of spontaneous polarization and electrical creep and domain switching emission. Also, two-dimensional phase field simulations are carried out to capture electrical creep and domain switching emission from the crack tip of a stationary inclined crack embedded in ferroelectrics. Statement of Contribution/Methods The microstructure of domain evolution is simulated near the crack tip. The electromechanical fracture behavior of ferroelectrics is evaluated by the concept of configurational forces which interpreted as the crack driving force. The spatial and temporal evolution of domain switching near the tip of an inclined crack is observed in ferroelectrics by a standard birefringence system. Moreover, the phase field modeling is developed to simulate polarization distribution and domain switching near the crack tip where the time-dependent Ginzburg–Landau equation is used to describe the change of polarization. Results The configurational force with respect to the applied electric field shows a butterfly loop for the initially unpoled ferroelectric status while only a half butterfly loop for the initially poled case is obtained. The birefringence results sho

关键词： piezoelectric ferroelectrics domain switching crack fracture

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Journal of Advanced Dielectrics 2019年第5期9卷 1-27页

作者： Qingyuan Hu Xiaoyong Wei Electronic materials Research laboratory Key Laboratory of the Ministry of Education Xi’an Jiaotong UniversityXi’anShaanxi 710049P.R.China International Center for Dielectric Research School of Electronic Science and Engineering Xi’an Jiaotong University Xi’anShaanxi 710049P.R.China

Relaxor ferroelectrics have been extensively studied due to their outstanding dielectric,piezoelectric,energy storage,and electro-optical *** various theories were proposed to elaborate on the relaxation phenomena,polar nanoregions formed by disruption of the long-range-order structures are considered to play a key role in relaxor ***,relaxor ferro-electrics are formed by aliovalent substitution or isovalent substitution in normal ferroelectrics,or further combinations of solid ***,one category of BaTiO_(3)-based relaxor ferroelectrics with abnormal phase transition and polarization mismatch phenomena is *** parameters of such BaTiO_(3)-based relaxor ferroelectrics,including the Curie temperature,polarization,and lattice parameter,show a typical“U”-shaped variation with *** studied BaTiO_(3)-based relaxor ferroelectrics are mostly solid solutions of A-site coupling and B-site coupling ferroelectrics,exhibiting polarization mismatch in certain compositions[e.g.,0.9BaTiO_(3)-0.1BiScO_(3),0.8BaTiO_(3)-0.2Bi(Mg_(1/2)Ti_(1/2)O_(3),0.8BaTiO_(3)-0.2Bi(Mg_(2/3)Nb_(1/3)O_(3),0.5BaTiO_(3)-0.5Pb(Mg_(1/3)Nb_(2/3)O_(3),0.4BaTiO_(3)-0.6Pb(Zn_(1/3)Nb_(2/3)O_(30,etc.].Of particular interest is that excellent electrical properties can be achieved in the studied relaxor ***,polarization mismatch theory can also provide guidance for the design of new high-performance lead-free relaxor ferroelectrics.

关键词： Relaxor ferroelectrics phase transition polarization mismatch energy storage

Achieving both large piezoelectric constant and low dielectric loss in BiScO_(3)-PbTiO_(3)-Bi(Mn_(2/3)Sb_(1/3))O_(3)high-temperature piezoelectric ceramics

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Journal of Advanced Dielectrics 2022年第6期12卷 24-31页

作者： Yunyun Feng Changhong Yang Xiaoying Guo Wei Sun Wenxuan Wang Xiujuan Lin Shifeng Huang Shandong Provincial key laboratory of Preparation and Measurement of Building materials University of Jinan Jinan 250022P.R.China

BiScO_(3)-PbTiO_(3)binary ceramics own both high Curie temperature and prominent piezoelectric properties,while the high dielectric loss needs to be reduced substantially for practical application especially at high *** this work,a ternary perovskite system of(1-x-y)BiScO3-yPbTiO3-xBi(Mn_(2/3)Sb_(1/3))O_(3)(BS-yPT-xBMS)with x=0.005,y=0.630-0.645 and x=0.015,y=0.625-0.640 was prepared by the traditional solid-state reaction *** phase structure,microstructure,dielectric/piezoelectric/ferroelectric properties were *** BS-yPT-xBMS ceramic series,the BS-0.630PT-0.015BMS at morphotropic phase boundary possesses the reduced dielectric loss factor(tanδ=1.20%)and increased mechanical quality factor(Qm=84),and maintains a high Curie temperature(TC=410°C)and excellent piezoelectric properties(d_(33)=330 pC/N)*** particular importance,at elevated temperature of 200°C,the value of tanδis only increased to 1.59%.All these properties indicate that the BS-0.630PT-0.015BMS ceramic has great potential for application in high-temperature piezoelectric devices.

关键词： High-temperature piezoelectric ceramics BiScO_(3)-PbTiO_(3) morphotropic phase boundary Bi(Mn_(2/3)Sb_(1/3))O_(3).

DOMAIN SWITCHING EMISSION FROM THE MIXED-MODE CRACK IN piezoelectricS/ferroELECTRICS

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DOMAIN SWITCHING EMISSION FROM THE MIXED-MODE CRACK IN PIEZO...

Electromechanical coupling properties of a self-powered vibration sensing device for near-surface observation tower monitoring

2016年全国压电和声波理论及器件应用研讨会

作者： Su-xin PAN Qi-da LIU Jie WANG Qun LI State key laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Xi'an Jiaotong University Department of Engineering Mechanics School of Aeronautics and Astronautics Zhejiang University

Background, Motivation and Objective The wide use of piezoelectric/ferroelectric ceramics in smart structures, such as sensors and actuators, raises the important issue of their reliability. piezoelectric/ferroelectric ceramics are brittle and susceptible to cracking at all scales ranging from electric domain to devices since the materials often possess the mixed-mode fracture under mechanical or electrical loadings. The fracture behaviors of piezoelectric/ferroelectric ceramics show a high complexity attributed to the inhomogeneous electro-mechanical fields induced by domain switching near the crack tip. Although the profile of domain switching zone in the vicinity of a crack tip has been carried out by theoretical and experimental investigations, the real spatial and temporal evolution of domain switching near the crack tip is rarely reported in piezoelectrics/ferroelectrics, especially through experimental observation. In this study, the experiments are conducted to observe the variation of spontaneous polarization and in turn electrical creep and domain switching emission from the crack tip of an inclined crack in piezoelectrics/ferroelectrics using a standard birefringence system. Moreover, two-dimensional phase field simulations are carried out to capture electrical creep and domain switching emission from the crack tip of a stationary inclined crack embedded in piezoelectrics/ferroelectrics. Statement of Contribution/Methods The spatial and temporal evolution of domain switching near the tip of a mixed-mode crack(e.g., an inclined crack) is observed in piezoelectrics/ferroelectrics. The birefringence technique is used to measure the optical quantities to demonstrate the domain switching near the crack tip. Moreover, the phase field modeling is developed to simulate polarization distribution and domain switching near the crack tip where the time-dependent Ginzburg–Landau equation is used to describe the change of polarization. Results The birefringence results

关键词： piezoelectric/ferroelectric Domain switching emission Crack Birefringence Phase field modeling

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Science China(Technological Sciences) 2022年第7期65卷 1545-1557页

作者： MU JiLiang HE HuiCheng MU JinBiao HE Jian SONG JinSha HAN XiaoTao FENG ChengPeng ZOU Jie YU JunBin CHOU XiuJian Science and Technology on Electronic Test and Measurement laboratory North University of ChinaTaiyuan 030051China Sichuan Aerospace Fenghuo Servo Control Technology Corporation Chengdu 610000China

The wind-induced vibration of a remote sensing tower is the key factor affecting the stability of image sensing and structural reliability. Monitoring the vibration of a long-time unattended tower is critical to its proper operation. Currently, most monitoring devices are supplied with wired power or battery, significantly limiting their practical applications in remote areas. In this paper,a self-powered vibration sensing device based on hybrid electromechanical conversion mechanisms is proposed. The device depends on a cylindrical magnetic levitation structure sensitive to ambient vibration for transferring mechanical energy and is taken as a dual-functional heterogeneous integrated system comprising electromagnetic, piezoelectric, and triboelectric generators. When the device vibrates under environmental force driving, the suspension magnet reciprocates vertically and generates induced electromagnetic energy, which is used to power the device. Moreover, the triboelectric and piezoelectric voltages,respectively originating from magnet impact on two separation friction materials and magnetic field repulsion-induced strain deformation of a piezoelectric sheet, are used as the synergistic sensing signals. To improve the output energy, a set of dualsegmented annular coils is designed in an electromagnetic generator, which greatly avoids the obstructive effect of the suspended magnet on the magnetic flux change at its end. Compared with a whole isochoric coil, it increases the output voltage by 78.3%.For the triboelectric sensing module, a silicone film with a large specific surface area is fabricated via 3D modification, which improves the output voltage by 29.4%. Furthermore, a pair of piezoelectric sensing modules is set to improve the accuracy of comparative sensing data. The experimental measurement shows that the device maintains a high sensitivity of 6.711 V(m s;);and excellent linearity of 0.991 in the range of 0–14 m s;. This work provides a practical strategy

关键词： remote sensing tower electromechanical coupling synergistic sensing magnetic levitation vibration online monitoring

Electronic Skin from High-Throughput Fabrication of Intrinsically Stretchable Lead Zirconate Titanate Elastomer

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Research 2020年第1期2020卷 1-11页

作者： Yiming Liu Huanxi Zheng Ling Zhao Shiyuan Liu Kuanming Yao Dengfeng Li Chunki Yiu Shenghan Gao Raudel Avila Pakpong Chirarattananon Lingqian Chang Zuankai Wang Xian Huang Zhaoqian Xie Zhengbao Yang Xinge Yu Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Department of Biomedical Engineering Tianjin UniversityTianjin 300000China Department of Mechanical Engineering McCormick School of EngineeringNorthwestern UniversityEvanstonIL 60208USA School of Biology Science and Medical Engineering Beihang UniversityBeijing 100191China State key laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsInternational Research Center for Computational MechanicsDalian University of TechnologyDalian 116024China

Electronic skin made of thin,soft,stretchable devices that can mimic the human skin and reconstruct the tactile sensation and perception offers great opportunities for prosthesis sensing,robotics controlling,and human-machine *** materials and mechanics engineering of thin film devices has proven to be an efficient route to enable and enhance flexibility and stretchability of various electronic skins;however,the density of devices is still low owing to the limitation in existing fabrication ***,we report a high-throughput one-step process to fabricate large tactile sensing arrays with a sensor density of 25 sensors/cm^(2) for electronic skin,where the sensors are based on intrinsically stretchable piezoelectric lead zirconate titanate(PZT)*** PZT elastomer sensor arrays with great uniformity and passive-driven manner enable highresolution tactile sensing,simplify the data acquisition process,and lower the manufacturing *** high-throughput fabrication process provides a general platform for integrating intrinsically stretchable materials into large area,high device density soft electronics for the next-generation electronic skin.

关键词： enable Skin integrating

多维协同效应诱导的高压电性及可靠性的KNN压电陶瓷应用于高频超声换能器

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Science China materials 2023年第2期66卷 686-695页

作者：李睿琛曾禹舜孙茜茜李崇阳李润泽郑婷蒋来明吴家刚 Department of materials Science Sichuan UniversityChengdu 610064China Department of Biomedical Engineering Viterbi School of EngineeringUniversity of Southern CaliforniaLos AngelesCA 90089USA

高频超声换能器已成为现代医学诊断和治疗的有力工具.目前,大多数超声换能器使用压电陶瓷进行机电耦合,在高频(>20 MHz)下会发生周期性的电声转换,因此对材料可靠性要求较高.本文提出了一种结构调控策略,以提高铌酸钾钠(KNN)基无铅陶瓷... 详细信息

高频超声换能器已成为现代医学诊断和治疗的有力工具.目前,大多数超声换能器使用压电陶瓷进行机电耦合,在高频(>20 MHz)下会发生周期性的电声转换,因此对材料可靠性要求较高.本文提出了一种结构调控策略,以提高铌酸钾钠(KNN)基无铅陶瓷的压电性与可靠性,并用于高频超声成像.该KNN基陶瓷具有增强的压电性(d33~550±20 pC N^(-1))及抗疲劳特性,同时针对其良好性能,我们从涉及宏观到微观的多项共存、完好微观结构与灵活畴翻转的多维度协同效应阐述其机理.该多维度协同效应抑制了疲劳过程中性能恶化裂纹的出现及空间电荷的聚集,从而减少了畴壁的钉扎,增强了抗疲劳性.此外,基于该高性能压电陶瓷制备的超声换能器具有高可靠性及温度稳定性(从室温到80℃,频带宽度几乎不变).我们利用该超声换能器扫描罗非鱼眼球结构测试了器件成像效果.相信通过结构策略实现性能提升的新方法可以促进KNN基超声器件在生物医学方面的应用.

关键词： KNN 超声换能器压电陶瓷抗疲劳特性频带宽度抗疲劳性压电性机电耦合