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Numerical modelling of the viscoelastic polymer melt flow in material extrusion additive manufacturing

Xuguang Xu, Wanglin Qiu, Dongdong Wan, Jin Wu, Feihu Zhao Orcid Logo, Yi Xiong Orcid Logo

Virtual and Physical Prototyping, Volume: 19, Issue: 1

Swansea University Author: Feihu Zhao Orcid Logo

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DOI (Published version): 10.1080/17452759.2023.2300666

Abstract

In material extrusion (MEX), it is challenging to accurately predict the steady and transient feeding forces at various polymer extrusion rates when printing island and thin-walled structures involving rapid start/stop or acceleration/deceleration, especially for semi-crystalline polymers. This rese...

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Published in: Virtual and Physical Prototyping
ISSN: 1745-2759 1745-2767
Published: Informa UK Limited 2024
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URI: https://cronfa.swan.ac.uk/Record/cronfa68088
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Abstract: In material extrusion (MEX), it is challenging to accurately predict the steady and transient feeding forces at various polymer extrusion rates when printing island and thin-walled structures involving rapid start/stop or acceleration/deceleration, especially for semi-crystalline polymers. This research presents a non-isothermal viscoelastic Computational Fluid Dynamics model to investigate the steady and transient feeding forces, as well as the phase transition process and viscoelastic behaviour of polylactic acid (PLA), a semi-crystalline polymer, during the extrusion process. The study establishes a relationship between polymer flow and viscoelastic stress, demonstrating that the elastic effect during extrusion is more significant than the viscous effect, particularly at higher feeding rates. Furthermore, the study uncovers critical aspects of PLA melt flow behaviour during the MEX process, laying the foundation for future research and optimisation of MEX printing processes.
College: Faculty of Science and Engineering
Funders: This work was supported by National Natural Science Foundation of China: [Grant Number grant number 52105261] Guangdong Innovative and Entrepreneurial Research Team Program: [Grant Number 2021ZT09X256] Shenzhen Science and Technology Innovation Committee: [Grant Number JCYJ20210324104610028]
Issue: 1

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