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Simulation du procédé de fabrication directe de pièces thermoplastiques par fusion laser de poudre

Abstract : Direct manufacturing technology using Selective Laser Sintering of thermoplastic powder allows obtaining final parts in a short time, with a high degree of geometry flexibility and evolution. Parts are built layer by layer, a specific area of each layer is melted by the laser radiation and the whole part is cooled down slowly to induce a good densification, permitting the gas diffusion through the melted material. The mechanical properties of parts made by this process highly depend on the final polymer density. A lot of process and material parameters control the parts properties. The key of the process master lies in its perfect thermal control. The aim of this work is to model the selective laser sintering process for high temperature polymers like PEEK at two scales. Firstly, a microscopic simulation of the melting and the grain coalescence of preheated polymer powder bed is performed using the C-NEM method implemented on Matlab. This tool allows to study the material thermal cycles, the powder densification and the welding quality of grains for different material and process parameters. Then, the thermal study of the additional powder layer spreading on the melted layer is performed on a commercial finite element software. This study aims to determine the good spreading conditions allowing the melted material not to decrease below its crystallization temperature to enhance material densification.
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https://pastel.archives-ouvertes.fr/pastel-00871731
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Submitted on : Thursday, October 10, 2013 - 11:57:54 AM
Last modification on : Monday, March 30, 2020 - 8:43:43 AM
Document(s) archivé(s) le : Saturday, January 11, 2014 - 4:20:09 AM

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DEFAUCHY_-_Denis.pdf
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  • HAL Id : pastel-00871731, version 1

Citation

Denis Defauchy. Simulation du procédé de fabrication directe de pièces thermoplastiques par fusion laser de poudre. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2013. Français. ⟨NNT : 2013ENAM0013⟩. ⟨pastel-00871731⟩

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