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Etude et Modélisation de la rhéologie des polymères au cours du procédé FDM (Fabrication additive)

Abstract : The aim of this study is to model the rheological characteristics of 3D-printed parts. To achieve this goal, a bibliographic study was carried out on the effects of major process variables on temperature evolution and their impact on rheological characteristics. Since the rheological characteristics such as viscosity are a function of temperature, they could be correlated to the temperature evolution of deposited filaments. Besides, to acknowledge the bonding of adjacent filaments, it is important to consider the temperature evolution at their interfaces.At the early stage, the role of three parameters, liquefier temperature, platform temperature, and print speed on the mechanical strength and the quality of final part has been discussed. It was found that interaction of parameters plays the most important role in consideration of mechanical characterization of printed parts and also Young’s modulus and failure strain could be an indicator to evaluate the mechanical performance of printed parts. Then, finite volume method was applied to model the heat transfer of deposited filaments and then was validated by a novel experimental approach in which very small K-type thermocouples were employed to perform the in-process monitoring of temperature profile at the interface of deposited filaments. The temperature evolution was predicted in good agreement with the recorded experimental results.The obtained results were then embedded into the rheological characteristic of filaments by modeling the viscosity evolution of filaments and the effect of major process variables on them. Moreover, efforts have been made to propose a ‘Time-Temperature-Transformation’ (TTT) diagram of filaments during deposition that enables the evaluation of temperature and viscosity simultaneously. The consequence of this study is then a computer code that considers the obtained results and predictions, with the potential of letting researchers in optimizing the process to obtain good final parts.
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Submitted on : Monday, May 30, 2022 - 5:51:15 PM
Last modification on : Wednesday, September 28, 2022 - 5:54:03 AM
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  • HAL Id : tel-03682154, version 1

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Hamidreza Vanaei. Etude et Modélisation de la rhéologie des polymères au cours du procédé FDM (Fabrication additive). Mécanique des matériaux [physics.class-ph]. HESAM Université, 2021. Français. ⟨NNT : 2021HESAE047⟩. ⟨tel-03682154⟩

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