Finite element simulation of leaky lamb wave at fluid-solid interfaces excited thermoelastically by pulsed laser

Based on the variation principle, the corresponding finite element equationsfor the thermoelstic and heat conduction equations are obtained. The finiteelement equations for the fluid-solid interface waves propagated along thewater-aluminum, air-aluminum interfaces are solved by using the numericalmethod of integration, and then the transient waveforms excitedthermoelastically by a pulsed laser line source are obtained. The resultsshow that the leaky Lamb wave exists at the liquid-solid interface and alsoexists at air-solid interface; in reverse to the Lamb wave, the S_0 modeof leaky Lamb wave is antisymmetric, and the A_0 is symmetric; due tothe difference of the two kinds fluid-solid interfaces, the waveforms andamplitudes of the two leaky Lamb waves are different.