J. K. Du

Ningbo University, Ning-po, Zhejiang Sheng, China

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Publications (4)8.01 Total impact

  • J Zhang · Y P Shen · J K Du
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    ABSTRACT: The effect of inhomogeneous initial stress on Love wave propagation in layered magneto-electro-elastic structures is investigated in this paper. The coupled magneto-electro-elastic field equations are solved by adopting the Wentzel–Kramers–Brillouin (WKB) approximate approach. Then the phase velocity can be calculated by applying boundary and continuity conditions. A specific example of a structure consisting of a CoFe2O4 layer and a BaTiO3 substrate is used to illustrate the influence of inhomogeneous initial stress on the phase velocity, corresponding coupled magneto-electric factor and stress fields. The different influence between constant initial stress and inhomogeneous initial stress is discussed and the results are expected to be helpful for the preparation and application of Love wave sensors.
    Smart Materials and Structures 02/2008; 17(2):025026. DOI:10.1088/0964-1726/17/2/025026 · 2.45 Impact Factor
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    J. K. Du · J. Wang · Y.Y. Zhou
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    ABSTRACT: Thickness vibrations of a piezoelectric plate under uniform initial thermoelectromechanical fields are investigated in this article. An exact solution is obtained for materials with general anisotropy. A plate of langasite, a relatively new piezoelectric material with strong piezoelectric coupling, is analyzed with imposed uniform acceleration as the biasing field as an example. The results show that the biasing fields have remarkable effect on the free vibrations of piezoelectric plate. (c) 2006 Elsevier B.V. All rights reserved.
    Ultrasonics 01/2007; DOI:10.1016/j.ultras.2006.05.183 · 1.81 Impact Factor
  • J.K. Du · Y.P. Shen · D.Y. Ye · F.R. Yue
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    ABSTRACT: This paper presents an analysis of the scattering of anti-plane shear waves by a single piezoelectric cylindrical inhomogeneity partially bonded to an unbounded piezomagnetic matrix. The anti-plane governing equations for linearly magneto-electro-elastic medium are reduced to one Helmholtz and two Laplace's equations. The fields of scattered waves are obtained by means of the wave function expansion method on condition that the bonded interface is perfect. The region of the debonding is modeled as an interface crack with noncontacting faces. The magneto-electric permeable boundary conditions are adopted, i.e. the normal electric displacement, electric potential, normal magnetic induction and magnetic potential are continuous across the crack faces. The crack opening displacement is represented by Chebyshev polynomials and a system of equations is derived and solved for the unknown coefficients. Some examples are calculated and the results are figured. The results show that the COD increases as k1a becomes larger initially, then the COD decreases as k1a becomes larger still, where k1 is the incident wave number and a the inhomogeneity radius. The COD gets smaller as the piezoelectric coefficient of the inhomogeneity increases.
    International Journal of Engineering Science 05/2004; 42(8-42):887-913. DOI:10.1016/j.ijengsci.2003.07.010 · 2.29 Impact Factor
  • Source
    J. K. Du · Y. P. Shen · X. Wang
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    ABSTRACT: This paper presents an analysis of the scattering of anti-plane shear waves by a single piezo-electric cylindrical inclusion partially bonded to an unbounded matrix. The anti-plane governing equations for piezoelectric materials are reduced to Helmholtz and Laplacian equations. The fields of scattered waves are obtained by means of the wave function expansion method when the bonded interface is perfect. When the interface is partially debonded, the region of the debonding is modeled as an interface crack with non-contacting faces. The electric permeable boundary conditions are adopted, i.e. the normal electric displacement and electric potential are continuous across the crack faces. The crack opening displacement is represented by Chebyshev polynomials and a system of equations is derived and solved for the unknown coefficients.
    Acta Mechanica 08/2002; 158(3):169-183. DOI:10.1007/BF01176907 · 1.47 Impact Factor

Publication Stats

57 Citations
8.01 Total Impact Points

Institutions

  • 2007–2008
    • Ningbo University
      Ning-po, Zhejiang Sheng, China
  • 2002–2004
    • Xi'an Jiaotong University
      • Department of Engineering Mechanics
      Ch’ang-an, Shaanxi, China