Abstract
This paper aims to study the working mechanism of pulsed laser generated ultrasonics on metallic surfaces as well as evaluate the pulse laser parameter effect on the generated waves. A thermoelastic model is adopted assuming that the pulsed laser works in the thermoelastic regime and illuminates on a half space metallic structure. Through Hankel-Laplace transform, the surface temperature and displacement are solved in the transformed frequency and wavenumber domain. The numerical solutions are then obtained through inverse Hankel-Laplace transform. Laser parameter effect on the epicenter displacement is studied, showing that the increase of excitation energy and decrease of laser beam radius both increase the epicenter displacement.
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