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Theses

Contributions à la modélisation et simulation multi-échelle de problèmes en lien avec la Fabrication Additive par Fusion laser sur lit de poudre

Abstract : The works carried out in this thesis is part of a project aiming at developing numerical methodologies to assist in the design of parts manufactured using the Selective Laser Melting (SLM) process. They focus on the macroscopic description of the thermal scenario undergone by the part during its manufacture and aim firstly at developing a modelling framework, based on the Arlequin framework, which will allow, i) to overcome the complexities of the problem, in particular: the intense thermal gradients located under the laser, the non-linear phase change phenomenon, the permanent geometrical domain evolutions..., ii) to potentially refine the modelling by going down to the mesoscopic and microscopic scales. In order to reduce numerical costs, a coupling method called "compatible", which allows to overcome the "difficulties" linked to the Arlequin framework implementation, demonstrates, through comparisons with surface type couplings, a higher speed of convergence. Also, the descent of the modelling towards fine scales being very complex, it can only be achieved through a numerical forces addition. An extension of the Iterative Global-Local Non-Invasive Methods to the case of a volume coupling is proposed, opening a cooperation between different codes, efficient for particular physics and scales. A last part of this work explores the possibility of using locally the Proper Generalized Decomposition method in order to further reduce numerical costs. Most of the work carried out can be generalised to issues other than Additive Manufacturing.
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Submitted on : Saturday, January 15, 2022 - 1:01:23 AM
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  • HAL Id : tel-03527126, version 1

Citation

Romain Ruyssen. Contributions à la modélisation et simulation multi-échelle de problèmes en lien avec la Fabrication Additive par Fusion laser sur lit de poudre. Génie mécanique [physics.class-ph]. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPAST011⟩. ⟨tel-03527126⟩

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