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Theses

Perçage profond par laser : Analyse des processus physiques

Abstract : This work is about laser percussionnal drilling and aimed at:
• Understood physical phenomena during laser drilling,
• Determined drilling geometry as function of experimental parameters.

The first step was to identify and control the process parameters. By this way, next to this work, some characterization methods about laser source and its environment was set up. The limitation of traditional diagnostic lead to the development of a new analysis method called DODO (Direct Observation of Drilled hOle).
The specific study on the physical process, bring some original and understandable answers about mechanisms during laser drilling process. Theses studies are about laser absorption and transmission, hydrodynamic phenomena and morphologic evolution with laser parameters.
Absorption during laser drilling decreases to a constant value equal to 80 %, whatever the target material. Transmission through a hole is function of hole depth. Its decrease is due to the walls drilling absorption. The metallic vapor jet is supersonic. Two profiles are shown (U and V) and from which laser parameter can be deduce without ambiguity. And last but not least, the usefulness of the assistant gas is discussed and called in question. It is shown that gas can not penetrate inside a blind hole, so during the laser drilling.
These results call into question a whole of knowledge, inherited cutting by laser. They constitute a solid bases data on the topics to improve the control of the process.
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https://tel.archives-ouvertes.fr/tel-00271589
Contributor : Matthieu Schneider <>
Submitted on : Wednesday, April 9, 2008 - 4:00:44 PM
Last modification on : Wednesday, December 9, 2020 - 3:16:48 PM
Long-term archiving on: : Friday, May 21, 2010 - 1:34:08 AM

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  • HAL Id : tel-00271589, version 1

Citation

Matthieu Schneider. Perçage profond par laser : Analyse des processus physiques. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2006. Français. ⟨tel-00271589⟩

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