A laser shock wave is a pressure wave that travels through a material at supersonic speed induced by a high-power laser pulse. Shock waves suddenly change direction as reflected at the physical limits of the medium, producing interference between the wave remnants. The reflected wave reaches the front surface transiting a distance as a function of the thickness and the reflection angle. The time it takes for the shock wave from being induced to reflect toward the front surface of the material can be used to determine the thickness of the propagation medium. A finite element method estimate the propagation of a laser shock wave in four basic geometric shapes of 6061-T6 aluminum alloy. The time it takes to reach the front surface of the geometric shapes is measured. Its controlled the material thickness and spatial coordinate of the induction. The effects of the porosity, absorption and transmission of the medium are ignored. The results demonstrate the feasibility of use the time-of flight as a thickness measurement and a distribution of compression and pressure zones inside the medium generated by the wave interference. Some applications of this method are to determine the thickness of solid materials, the estimation of caverns or aquifers on geophysics, and the determination of the density of a material.
A study of the of laser peen forming of thin stainless steel metal foils (50 μm thick) using a solid-state ps-pulsed laser, emitting at a wavelength of 1064 nm was conducted. The dependence of the bending angle and the radius of curvature on the energy per pulse, the treated area, the distance between lines, and the repetition rate of the treatment is presented. The study also shows that the bending effect is local, and it cannot be scaled by increasing the repetition rate, because the increase in temperature relaxes the superficial stresses previously induced.
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