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ISSN: 2475-4811 (print)
ISSN: 2475-482X (online)
Journal of Vibration Testing and System Dynamics

C. Steve Suh (editor), Pawel Olejnik (editor),

Xianguo Tuo (editor)

Pawel Olejnik (editor)

Lodz University of Technology, Poland

Email: pawel.olejnik@p.lodz.pl

C. Steve Suh (editor)

Texas A&M University, USA

Email: ssuh@tamu.edu

Xiangguo Tuo (editor)

Sichuan University of Science and Engineering, China

Email: tuoxianguo@suse.edu.cn

Energy Harvesting Performance of Lead-free Piezoelectric Ceramics Bimorphs with Transverse Mode

Journal of Vcibration Testing and System Dynamics 3(1) (2019) 11--24 | DOI:10.5890/JVTSD.2019.03.002

Shang Wang$^{1}$, Turki Alghamdi$^{2}$, Zengmei Wang$^{3}$, FengxiaWang$^{2}$

$^{1}$ Department of Electronic Information Science and Technology, Liao Ning University, ChongShan, P. R. China

$^{2}$ Department of Mechanical and Industrial Engineering, Southern Illinois University Edwardsville, IL62026-1085, USA

$^{3}$ School of Materials Science and Engineering, Key lab. of Construction Materials, Southeast University, Nanjing 211189, P. R. China

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Abstract

Piezoelectric material has been extensively used in energy harvesting technologies. However, most commercially available piezoelectric materials, Pb [ZrxTi1-x] O3 (PZT), contains of more than 60 weight percent lead (Pb) [1]. Because of its extremely hazardous effects of lead elements, there is a strong motive to substitute PZT by new lead-free materials with comparable properties to those of PZT. This paper tested three different piezoelectric bimorphs, one is made by lead-free piezoelectric materials Barium Titanate (BaTiO3) (BT) and the other two are made from traditional Pb [ZrxTi1-x] O3 (PZT). Their output voltage and power were studied and compared when the cantilever bimorphs subjected to a tip or a base excitation. Equivalent circuit models of both lead free Ba-Tio3 and traditional PZT cantilevered piezoelectric energy harvester (Mech-PEH) were built in ANSYS APDL. The Finite Element (FEM) model was validated through comparing the output voltage and power with the experiment results. The energy harvesting performance of the lead free piezoelectric bimorph were compared with the same size high performance PZT bimorph via FEM analysis. The factors contribute to the piezoelectric material’s behavior were described. The output voltage and power were computed with the transient vibrations caused by plucking forces. Due to the complicated fabrication process of lead free piezoelectric samples, a typical quarter size samples were usually produced and examined by researchers before the mass production of formal rectangular shape bimorphs. Therefore, in this work, all bimorphs, including lead free Barium titanate (BaTiO3) (BT) and the other two types of PZTs, were composed of two quarter size circular ceramics and a rectangular substrate plate.

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