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Published in: The International Journal of Advanced Manufacturing Technology 2/2024

04-05-2023 | ORIGINAL ARTICLE

Experimental and numerical investigation of extrudate swell of polylactic acid via extrusion-based additive manufacturing process

Authors: Hong Wang, Faleh Rabhi, Abel Cherouat, Alexandre Gilbin, Thierry Barriere

Published in: The International Journal of Advanced Manufacturing Technology | Issue 2/2024

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Abstract

Extrudate swell is a rheological phenomenon of polymers that occurs after the extrusion die exit due to relaxation of the residual molecular stress. This phenomenon is essential to ensure the accuracy and stability of components manufactured by Extrusion-based additive manufacturing (EAM) process. Extrudate swell can be affected by multiple factors including material properties and processing parameters that can be coupled and it is difficult to fully understand their effects, especially in absence of accurate online measurement devices. In this study, the extrudate swell was investigated experimentally as a function of the extrusion rate, melt temperature and nozzle diameter for polylactic acid (PLA) material. The Computational fluid dynamics (CFD) and level set method (LS) in COMSOL Multiphysics were used to simulate the polymer flow out of the extrusion nozzle. The simulation results matched well with experimental results and showed that the swell rate decreases with increasing temperature and nozzle diameter and decreasing extrusion rate. These results can be used to optimize the parameters of EAM processes.

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Metadata
Title
Experimental and numerical investigation of extrudate swell of polylactic acid via extrusion-based additive manufacturing process
Authors
Hong Wang
Faleh Rabhi
Abel Cherouat
Alexandre Gilbin
Thierry Barriere
Publication date
04-05-2023
Publisher
Springer London
Published in
The International Journal of Advanced Manufacturing Technology / Issue 2/2024
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI
https://doi.org/10.1007/s00170-023-11493-z

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