Effects of Fiber Thickness and Volume Fraction on the Strain Performance of Piezoelectric Fiber Composites

doi:10.15541/jim20140565

Journal of Inorganic Materials ›› 2015, Vol. 30 ›› Issue (6): 571-575.DOI: 10.15541/jim20140565

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Effects of Fiber Thickness and Volume Fraction on the Strain Performance of Piezoelectric Fiber Composites

CHEN Zi-Qi¹, ZHU Song¹, LIN Xiu-Juan^1,2, XIONG Wei^3,4, ZHOU Ke-Chao¹, ZHANG Dou¹

(1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. School of Materials Science and Engineering, Jinan University, Jinan 250022, China; 3. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 4. School of Metallurgy and Materials, University of Birmingham, Birmingham B152TT, UK)

Received:2014-11-06 Revised:2015-01-05 Published:2015-06-04 Online:2015-05-22
About author:CHEN Zi-Qi. E-mail: chenziqiqi@126.com
Supported by:
National Natural Science Foundation of China (51072235);Hunan Nonferrous Research Funding (YSZN2013CL05);Defense Industrial Technology Development Program (A1420133028)

Abstract

Abstract:

Piezoelectric fiber composite is an emerging smart material and exhibits much broader applications than traditional piezoelectric ceramics, especially in light-weight and curved structures. Piezoelectric fiber composites with different fiber thickness and volume fraction were fabricated. The effects of structural parameters, i.e. different fiber thickness and volume fraction, on the strain properties and actuation performance of piezoelectric fiber composites were investigated at different excitation voltages at frequency of 0.1 Hz. The results indicated that the free strain and tip displacement decreased with the increasing thickness of piezoelectric fiber. When 1000 V voltage was applied, the free strain and tip displacement for the composite with fiber thickness of 200 μm were 665 με and 1.9 mm, respectively, which were much higher than those of composite with fiber thickness of 300 μm or 400 μm. Piezoelectric fiber composites exhibited orthotropic actuation properties, and higher free strains with larger fiber volume fraction. The longitudinal and transverse free strains of composites with 74% fiber volume fraction were 2.04 and 1.72 times magnitudes of composites with 59% fiber volume fraction, respectively. The transverse effect coefficient, the ratio between transverse and longitudinal free strains, decreased from 0.519 to 0.451 when the fiber volume fraction decreased from 74% to 59%.

Key words: piezoelectric fiber composite, free strain, tip displacement, orthotropic properties

CLC Number:

TQ174

CHEN Zi-Qi, ZHU Song, LIN Xiu-Juan, XIONG Wei, ZHOU Ke-Chao, ZHANG Dou. Effects of Fiber Thickness and Volume Fraction on the Strain Performance of Piezoelectric Fiber Composites[J]. Journal of Inorganic Materials, 2015, 30(6): 571-575.

Figures/Tables 6

Fig. 1 Schematic structure of piezoelectric fiber composites (a) and sample used in the experiment (b)

Fig. 2 Schematic diagram of displacement test platform

Fig. 3 Voltage amplitude dependence of (a) longitudinal free strain and (b) tip displacement for sample with different thickness of piezoelectric fiber

Fig. 4 SEM micrographs of piezoelectric fiber composites with different volume fractions of piezoelectric fiber (a) 59%; (b) 65%; (c) 74%

Fig. 5 Voltage amplitude dependence of free strain for sample with different volume fractions of piezoelectric fiber

Fig. 6 Comparison of experimental and mixing rules values of transverse effect coefficient

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Effects of Fiber Thickness and Volume Fraction on the Strain Performance of Piezoelectric Fiber Composites

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