Modélisation physique du procédé de découpe de métaux par laser

Abstract : On the basis of fundamental studies going from gaussian laser beam propagation to the molten metal removal by the action of the cutting assistance gas shear stresses, we perform a modeling of the laser cutting process. The whole modeling unifies every single fundamental phenomena to come up with a global 2D steady-state, self-consistent geometrical description of the cutting front. Comparisons between simulations and experimental data show quite a good agreement. Moreover, some complementary experiments carried out to get material absorptivity during the cutting process reveal that Fresnel theoretical absorptivity has to be increased of about 20%. This can be explained by the roughness and the dynamical behavior of the interaction surface (liquid-gas interface). Finally, this work ends with outlooks on 3D modeling of the cutting front, use of active cutting gas such as oxygen and notions on striation pattern and instability of the melt film.
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Contributor : Cédric Mas <>
Submitted on : Friday, August 8, 2003 - 11:15:51 AM
Last modification on : Wednesday, March 27, 2019 - 1:28:13 AM
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  • HAL Id : tel-00003252, version 1

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Cédric Mas. Modélisation physique du procédé de découpe de métaux par laser. Physique [physics]. Université Pierre et Marie Curie - Paris VI, 2003. Français. ⟨tel-00003252⟩

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