Laser peening process and apparatus with uniform pressure pulse

Details Laser peening process and apparatus with uniform pressure pulse Laser peening process and apparatus with uniform pressure pulse

1998-12-15

2000-04-11

Mills, Gregory

Electric heating

Metal heating

By arc

2191216, 21912185, B23K 2600

Patent

active

060490586

ABSTRACT:
A method and apparatus for improving properties of a solid material by providing shock waves therethrough. Laser shock processing is used to provide the shock waves. The method includes applying a transparent overlay to the solid material to be worked. The solid material or overlay is vibrated to release any gas bubbles or solid debris within the transparent layer which could cause localized non-uniform confinement of a pressure pulse applied for a workpiece thereby causing irregularities in the workpiece surface. A pulse of coherent laser energy is the directed to the coated portion of the solid material to create a shock wave. Additionally, the method may include adding a wetting agent or controlling the temperature of the overlay material to reduce the concentration of gas bubbles therein.

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Hong et al., "Confining Medium and Absorptive Overlay: Their Effects on a Laser-induced Shock Wave," Optics and Lasers in Engineering, vol. 29, 1998, pp. 447-455.
Laser Generation of 100-kbar Shock Waves in Solids, by Craig T. Walters (3 pages), 1992, in Shock Compression of Condensed Matter 1991, pp. 797-799.

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