Single mode lamb wave excitation in thin plates by Hertzian contacts

被引:38
作者
Degertekin, FL
KhuriYakub, BT
机构
[1] Edward L. Ginzton Laboratory, Stanford University, Stanford
关键词
D O I
10.1063/1.116902
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present novel techniques to selectively excite the lowest order symmetric (S-0) and antisymmetric (A(0)) Lamb wave modes in thin solid plates. Hertzian contacts are formed between the plates and the end of specially designed quartz rods which guide extensional waves generated by PZT-SH transducers bended at their other end. Mode selectivity is achieved by applying shear and/or longitudinal traction at the edge or the surface of the plates according to the results of a two-dimensional normal mode theory. In aluminum plates, mode selectivity is measured as a function of frequency for different traction forces. With normal forces, A(0) mode selectivity of more than 46 dB is obtained for fd<0.4 MHz mm. With antisymmetric shear traction at the edge of the plate, a selectivity exceeding 55 dB is achieved for single mode S-0 operation. (C) 1996 American Institute of Physics.
引用
收藏
页码:146 / 148
页数:3
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