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J4  2012, Vol. 46 Issue (3): 555-559    DOI: 10.3785/j.issn.1008-973X.2012.03.026
工程力学     
界面缺陷对压电薄层复合结构中Love波的影响
王惠明,赵志城
 浙江大学 工程力学系,浙江 杭州 310027
Effect of interfacial defect on Love waves in composite structures
with piezoelectric thin film
WANG Hui-ming, ZHAO Zhi-cheng
Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China
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摘要:

基于剪切弹簧模型,建立考虑界面缺陷情形的弹性基底上覆盖压电薄层的复合结构中Love波的频散方程,并研究界面缺陷对Love波传播特性的影响,给出铝基底上覆盖PZT4压电薄层复合结构中Love波的频散曲线.数值结果表明:(1)对于长波情形,不同缺陷程度复合结构的Love波一阶模态的相速度均趋于弹性基底层的剪切波波速,而对于短波情形,则趋于压电薄层的Bleustein-Gulyaev (B-G) 波波速;(2)界面缺陷的存在总是降低该复合结构内Love波的相速度,在一些特殊频率范围,Love波的相速度对界面缺陷非常敏感;(3)界面缺陷对压电层内的机械位移模态和电势模态有显著影响,且影响最大区域出现在界面附近.

Abstract:

Based on the shear spring model, the dispersion equation was established for Love waves propagating in a composite structure with interfacial defect. The composite structure consists of an elastic substrate covered by a piezoelectric thin film. The effect of the interfacial defect on the propagation properties of Love waves was investigated. The dispersion curves were presented for Love waves propagating in an aluminum substrate covered by a PZT4 piezoelectric thin film. Numerical results show that: (1) For different interfacial defects, the phase velocities of Love waves of the first mode at long wavelength region approach to the velocities of shear waves in elastic substrate, while those at short wavelength region approach to the velocities of Bleustein-Gulyaev (B-G) waves in piezoelectric thin film; (2) The existence of the interfacial defect always decreases the phase velocities of Love waves. At some special frequency ranges, the phase velocities of Love waves are more sensitive to the interfacial defect; (3) The interfacial defect has significant effect on the mode shapes of the mechanical displacement and the electric potential in the piezoelectric thin film, and the most susceptive region appears near the interface.

出版日期: 2012-03-01
:  O 347.4  
基金资助:

国家自然科学基金资助项目(10872179); 浙江省自然科学基金资助项目(Y7080298); 浙江省重点科技压电频率电子元器件技术及应用创新团队(2009R50025);浙江大学新星计划资助项目.

作者简介: 王惠明(1972-),男,副教授,从事弹性波和弹性动力学方面的研究. E-mail: wanghuiming@zju.edu.cn
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引用本文:

王惠明,赵志城. 界面缺陷对压电薄层复合结构中Love波的影响[J]. J4, 2012, 46(3): 555-559.

WANG Hui-ming, ZHAO Zhi-cheng. Effect of interfacial defect on Love waves in composite structures
with piezoelectric thin film. J4, 2012, 46(3): 555-559.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2012.03.026        http://www.zjujournals.com/eng/CN/Y2012/V46/I3/555

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