Rayleigh wave propagating in layered magneto-electro-elastic material structures
ABSTRACT An exact approach is used to investigate Rayleigh waves in magneto-electro-elastic material structure which involves a piezomagnetic layer bonded to a semi-infinite homogeneous piezoelectric substrate. The piezomagneticity and piezoelectricity are both polarized in z-axis direction. The analytical solution of dispersion relations is obtained and the results are presented.
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ABSTRACT: Exact solutions are derived for three-dimensional, anisotropic, linearly magneto-electro-elastic, simply-supported, and multilayered rectangular plates under static loadings. While the homogeneous solutions are obtained in terms of a new and simple formalism that resemble the Stroh formalism, solutions for multilayered plates are expressed in terms of the propagator matrix. The present solutions include all the previous solutions, such as piezoelectric, piezomagnetic, purely elastic solutions, as special cases, and can therefore serve as benchmarks to check various thick plate theories and numerical methods used for the modeling of layered composite structures. Typical numerical examples are presented and discussed for layered piezoelectric/piezomagnetic plates under surface and internal loads.Journal of Applied Mechanics 07/2001; 68(4). DOI:10.1115/1.1380385 · 1.40 Impact Factor
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ABSTRACT: Magnetoelectric (ME) CoFe2O4-Pb(Zr,Ti)O3 composite thin films have been prepared by a sol-gel process and spin-coating technique. X-ray diffraction and scanning electron microscopy reveal that there exists local aggregation or phase separation of the CoFe2O4 and Pb(Zr,Ti)O3 phases in the films. Vibrating sample magnetometer, ferroelectric test unit, and magnetoelectric measuring device were used to characterize the magnetic and ferroelectric properties, as well as the ME effect of the films. It is shown that the films exhibit both good magnetic and ferroelectric properties, as well as a ME effect. A high initial magnetoelectric voltage coefficient for the film is observed. The ME effect of the film strongly depends on the magnetic bias and magnetic field frequency.Applied Physics Letters 03/2005; 86(12). DOI:10.1063/1.1889237 · 3.52 Impact Factor
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ABSTRACT: SH surface acoustic wave (SH–SAW) propagation in a cylindrically layered magneto-electro-elastic structure is investigated analytically, where a piezomagnetic (or piezoelectric) material layer is bonded to a piezoelectric (or piezomagnetic) substrate. By means of transformation, the governing equations of the coupled waves are reduced to Bessel equation and Laplace equation. The boundary conditions imply that the displacements, shear stresses, electric potential, and electric displacements are continuous across the interface between the layer and the substrate together with the traction free at the surface of the layer. The magneto-electrically open and shorted conditions at cylindrical surface are taken to solve the problem. The phase velocity is numerically calculated for different thickness of the layer and wavenumber for piezomagnetic ceramics CoFe2O4 and piezoelectric ceramics BaTiO3. The effects of magnetic permeability on propagation properties of SH–SAW are discussed in detail. The distributions of displacement, magnetic potential and magneto-electromechanical coupling factor are also figured and discussed.Ultrasonics 01/2009; 49(1):131-138. · 1.81 Impact Factor