Laser-induced thermoelastic Leaky Lamb waves at the fluid-solid interface

A model based on the theory of fluid-structure interaction is developed to simulate the laser thermoelastic generation and propagation of Leaky Lamb waves at the water-aluminum interface. Each component of displacement, stress, and temperature are derived in transform domain by the photothermoelastic transfer matrix method. The time domain solutions are obtained by numerically inverting the transforms while the dispersion curves and attenuation curves for the leaky waves are also calculated. Then the propagation characteristics of different modes are analyzed. The model establishes a quantitative relation between the laser parameters, the material parameters, the corresponding waveforms, and the dispersion curves, which provides a useful tool for the Leaky Lamb waves applied to nondestructive evaluation.