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金峰, Xiaoshan Cao a, Feng Jin b, Insu Jeon a, *, Tian Jian Lu b
International Journal of Solids and Structures 46 (2009) 4123–4132,-0001,():
-1年11月30日
In this theoretical study, we investigate the propagation of Love waves in a layered structure consisting of two different homogenous piezoelectric materials, an upper layer and a substrate. A functionally graded piezoelectric material (FGPM) buffer layer is in between the upper layer and the substrate. We employ the power series technique to solve the governing differential equations with variable coefficients. The influence of the gradient coefficients of FGPM and the layer thicknesses on the dispersion relations, the electro-mechanical coupling factor, and the stress distributions of Love waves in this structure are investigated. We demonstrate that the low gradient coefficient raises the significant variation of the phase velocity within a certain range of ratios of upper layer thickness to equivalent thickness. The electro-mechanical coupling factor can be increased when the equivalent thickness equals one or two wavelengths, and the discontinuity of the interlaminar stress can be eliminated by the FGPM buffer layer. The theoretical results set guidelines not only for the design of high-performance surface acoustic wave (SAW) devices using the FGPM buffer layer, but also for the measurement of material properties in such FGPM layered structures using Love waves.
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金峰
,-0001,():
-1年11月30日
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【期刊论文】Propagation behavior of Love waves in a functionally graded half-space with initial stress
金峰, Zheng-Hua Qian a, b, *, Feng Jin a, Kikuo Kishimoto b, Tianjian Lu a
International Journal of Solids and Structures 46(2009)1354-1361,-0001,():
-1年11月30日
The propagation behavior of Love waves in a functionally graded material layered non-piezoelectric half-space with initial stress is taken into account. The Wentzel-Kramers-Brillouin (WKB) technique is adopted for the theoretical derivations. The analytical solutions are obtained for the dispersion relations and the distributions of the mechanical displacement and stress along the thickness direction in the layered structure. First, these solutions are used to study the effects of the initial stress on the dispersion relations and the group and phase velocities, then the influences of the initial stress on the distributions of the mechanical displacement and shear stresses along the thickness direction are discussed in detail. Numerical results obtained indicate that the phase velocity of the Love waves increases with the increase in the magnitude of the initial tensile stress, while decreases with the increase in the magnitude of the initial compression stress. The effects on the dispersion relations of the Love wave propagation are negligible as the magnitudes of the initial stress are less than 100MPa. Some other results are obtained for the distributions of field quantities along thickness direction. The results obtained are not only meaningful for the design of functionally graded structures with high performance but also effective for the evaluation of residual stress distribution in the layered structures.
Love waves, Initial stress, Functionally graded materials, Dispersion relations Wentzel-Kramers-Brillouin (, WKB), technique
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金峰
,-0001,():
-1年11月30日
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【期刊论文】Love waves propagation in a piezoelectric layered strucutre with initial stresses
金峰
,-0001,():
-1年11月30日
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