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Frequency dispersion of love waves in a piezoelectric nanofilm bonded on a semi-infinite elastic substrate

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Abstract

Research on the propagation of elastic waves in piezoelectric nanostructures is very limited. The frequency dispersion of Love waves in layered piezoelectric nanostructures has not yet been reported when surface effects are taken into account. Based on the surface elasticity theory, the propagation of Love waves with surface effects in a structure consisting of a nanosized piezoelectric film and a semi-infinite elastic substrate is investigated focusing on the frequency dispersion curves of different modes. The results show that under the electrically-open conditions, surface effects give rise to the dependence of Love wave dispersion on the film thickness when the thickness of the piezoelectric film reduces to nanometers. For a given wave frequency, phase velocity of Love waves in all dispersion modes exhibit obvious toward shift as the film thickness decreases or the surface parameters increase. Moreover, there may exist a cut-off frequency in the first mode dispersion below which Love waves will be evanescent in the structure due to surface effects. The cut-off frequency depends on the film thickness, the surface parameters and the bulk material properties.

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Correspondence to Bin Gu.

Additional information

Supported by National Natural Science Foundation of China(Grant No. 11372261), Excellent Young Scientists Supporting Project of Science and Technology Department of Sichuan Province, China(Grant No. 2013JQ0030), Supporting Project of Department of Education of Sichuan Province, China(Grant No. 2014zd3132), Opening Project of Key Laboratory of Testing Technology for Manufacturing Process, Southwest University of Science and Technology-Ministry of Education, China(Grant No. 12zxzk02), Fund of Doctoral Research of Southwest University of Science and Technology, China(Grant No. 12zx7106), and Postgraduate Innovation Fund of Southwest University of Science and Technology, China(Grant No. 15ycx128)

ZHANG Sijia, born in 1992, is currently a graduate candidate at School of Manufacturing Science and Engineering, Southwest University of Science and Technology, China.

GU Bin, born in 1975, is currently a professor at School of Manufacturing Science and Engineering, Southwest University of Science and Technology, China. He received his PhD degree from Tsinghua University, China in 2002. His research interest covers fracture mechanics, smart materials and multi-scale computational method.

ZHANG Hongbin, born in 1973, is currently a lecturer at School of Civil Engineering and Architecture, Hainan University, China. He received his master degree from Tsinghua University, China in 1999. His research focuses on modeling and numerical simulation on multi-physics coupling field problems.

PAN Rongying, born in 1991, is currently a graduate candidate at School of Manufacturing Science and Engineering, Southwest University of Science and Technology, China.

Alamusi, born in 1978, is currently an associate professor at School of Manufacturing Science and Engineer, Southwest University of Science and Technology, China. He received his PhD degree from Chiba University, Japan in 2013. His research is mainly on the development and applications of functional nanocomposites.

FENG Xiqiao, born in 1968, is currently the director of Institute of Biomechanics and Medical Engineering, Tsinghua University, China. He received his PhD degree from Tsinghua University, China in 1995. His research fields include biological mechanics, micro mechanics of cell damage and fracture mechanics.

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Zhang, S., Gu, B., Zhang, H. et al. Frequency dispersion of love waves in a piezoelectric nanofilm bonded on a semi-infinite elastic substrate. Chin. J. Mech. Eng. 28, 1157–1162 (2015). https://doi.org/10.3901/CJME.2015.0709.090

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  • DOI: https://doi.org/10.3901/CJME.2015.0709.090

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