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Contribution à l’optimisation des stratégies de lasage en fabrication additive LPBF

Abstract : During manufacturing by Laser Powder Bed Fusion (LPBF), the achieved temperatures in local areas could generate significant thermal gradients. These gradients lead to the apparition of residual stresses which affect the mechanical characteristics of the part and may cause deformation, as well as micro and macro cracks. In this context, scanning paths play a fundamental role on temperature level and distribution during manufacturing. For that reason, it is necessary to validate the generation of trajectories considering the thermal behaviour induced by this process. The purpose of this PhD thesis is to use an analytical method in order to develop a model that allows a fast and efficient analysis of thermal behaviour, during part manufacturing. Indeed, with a given scanning path, material properties and process parameters, the developed tool performs a temperature simulation at each point of the part, over time and in a fast way, compared to other thermal simulation software. In order to reduce computation time and memory storage used for such a simulation, a set of optimization techniques has been proposed. The developed model has been validated in the case of the Ti6Al4V alloy through a comparison with a finite element thermal simulation obtained by industrial software. Then, the results of this model were compared to experimental results. Once validated, it has been implemented to analyze trajectories commonly used in the literature and industry. In order to reduce thermal gradients and improve part quality, the proposed solution consists in controlling the temperature and size of melt pool. For this purpose, the developed thermal model has been used to modulate the process parameters during manufacturing on the one hand and to develop an adaptive scanning strategy on the other hand.
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https://hal.archives-ouvertes.fr/hal-02422204
Contributor : Sylvain Lavernhe Connect in order to contact the contributor
Submitted on : Friday, December 20, 2019 - 9:20:54 PM
Last modification on : Friday, August 5, 2022 - 2:58:08 PM

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  • HAL Id : hal-02422204, version 1

Citation

Kamel Ettaieb. Contribution à l’optimisation des stratégies de lasage en fabrication additive LPBF. [Travaux universitaires] Université Paris-Saclay; ENS Paris-Saclay; LURPA. 2019. ⟨hal-02422204⟩

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