Propagation of Love waves in a FGPM layered structure
- Resource Type
- Conference
- Authors
- Xiaoshan Cao; Insu Jeon
- Source
- 대한기계학회 춘추학술대회. 2009-05 2009(5):135-136
- Subject
- FGPM
Love waves
Dispersion relations
Electromechanical coupling factor
SAW
- Language
- Korean
A theoretical study has been undertaken into the propagation behavior of Love waves in a layered structure consisting of two different homogenous piezoelectric materials as the upper layer and substrate, and a functionally graded piezoelectric material (FGPM) buffer layer between the upper layer and the substrate. The power series technique is employed for solving the variable coefficient differential equations. The influence of the gradient coefficients of FGPM and the thicknesses of the layers on the dispersion relations, the electromechanical coupling factor, and the stress distributions of Love waves in this structure are investigated. The results shows that the low gradient coefficient raises the significant variation of the phase velocity for a certain range of the ratio of the upper layer thickness to the equivalent thickness and the electromechanical coupling factor can increase when the equivalent thickness equals one or two wavelengths. The theoretical results set guidance 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 by using Love waves.