Selective mode excitation of Lamb wave in composite laminates

S. Saravanan; N. Q. Guo; B. S. Wong; F. Ju

doi:10.1117/12.851655

14 April 2010 Selective mode excitation of Lamb wave in composite laminates

S. Saravanan, N. Q. Guo, B. S. Wong, F. Ju

Proceedings Volume 7522, Fourth International Conference on Experimental Mechanics; 75223B (2010) https://doi.org/10.1117/12.851655
Event: Fourth International Conference on Experimental Mechanics, 2009, Singapore, Singapore

Abstract

Lamb wave has a great potential for structural health monitoring of large area structures due to its long range propagation. The piezo array configurations and array pitch for selective mode excitation are first studied with 2D FE models in a composite plate. A single PZT actuator bonded on the top surface of the laminate in unimorph configuration excites both symmetric mode (S₀) and anti-symmetric mode (A₀). The A₀ mode is predominant and four times stronger than the S₀ mode. The second configuration is a bimorph where the PZT actuators are bonded on either side of the laminate. The in-phase excitation of PZT actuators suppress the A₀ mode and excite only the S₀ mode, while the out-of-phase excitation eliminates the S₀ mode and launches the A₀ mode in the laminate. The third configuration is the unimorph array configuration where PZT actuators are bonded on the top surface of the laminate. By keeping the array pitch equal to half wavelength of the S₀ mode, the S₀ mode gets suppressed by twelve times. The FE results are checked with experiments.

Citation Download Citation

S. Saravanan, N. Q. Guo, B. S. Wong, and F. Ju "Selective mode excitation of Lamb wave in composite laminates", Proc. SPIE 7522, Fourth International Conference on Experimental Mechanics, 75223B (14 April 2010); https://doi.org/10.1117/12.851655

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