Propagation characteristics of the laser-generated lower-order lamb waves in one-dimensional periodic thin plates |
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Authors: | Hong-xing Ding Zhong-hua Shen Jing Jia Xiao-wu Ni |
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Institution: | 1.College of science,Nanjing University of Science and Technology,Nanjing,China |
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Abstract: | Using the finite element method (FEM), we study the thermoelastic generation and the transmitted power spectra (TPS) of Laser-generated
lower-order Lamb wave mode in an one-dimensional thin aluminum plate engraved by a periodic rectangular grating. The calculation
verified that the equally good Lamb waves band gaps can also exist in an one-component periodic structure and the width and
location of the band gaps can be regulated by the parameters of the depth of the grooves (h), the ratio of the lattice period to the plate thickness (D/L) and the ratio of the width of the grooves to the lattice period (d/D). Specially, we suggest that Lamb wave band gaps can be substantially enlarged by using multiple periodic systems which consist
of several pieces of periodic structure with different D/L. |
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