期刊
APPLIED PHYSICS LETTERS
卷 95, 期 7, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3205126
关键词
dispersion relations; elastic waves; functionally graded materials; piezoelectric materials; surface acoustic waves; WKB calculations
资金
- Tokyo Institute of Technology
- National Natural Science Foundation of China [10632060]
- Program for New Century Excellent Talents in Universities [NCET0-8-0429]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20070698064]
An analytical study on transverse surface waves propagating in a functionally graded material carrying a piezoelectric layer is carried out by Wentzel-Kramers-Brillouin technique. Dispersion relations for the existence of the waves are obtained for material gradient of arbitrary functions and the effects of material gradient on wave propagation are quantified. Numerical examples show the presence of material gradient significantly affects long waves but has only negligible effects on short waves. Depending on whether the surface wave velocity is smaller or greater than the bulk-shear-wave velocity in the piezoelectric layer, two different types of dispersion behavior are discussed.
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