Non-Newtonian, non-isothermal three-dimensional modeling of strand deposition in screw-based material extrusion

Non-Newtonian, non-isothermal three-dimensional modeling of strand deposition in screw-based material extrusion

Alessio Pricci, Gianluca Percoco

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Abstract. Material extrusion (MEX) is one of the most widespread additive manufacturing techniques. Among the MEX processes, pellet additive manufacturing (PAM) is of primary interest in industry 4.0 scenario, mainly because of the lower unit cost, energy consumption and waste production, together with the wider range of printable materials. Mechanical properties are related to the intra and inter layer bonding, which in turn depends on the strand geometry. For the first time, the relationship between PAM processing parameters and layer morphology has been studied by means of non-Newtonian, non-isothermal three-dimensional numerical simulations; the influence on mass flow rate and strand shape has been investigated. A very good correspondence between experiments and numerical computations of layer shape was found. Thermal contact area increases at lower layer heights, but counterpressure limits the extruded mass flow rate. This effect can be mitigated by choosing higher barrel temperatures and screw speed.

Keywords
Additive Manufacturing, Pellet Extrusion, Virtual Modeling

Published online 9/5/2023, 11 pages
Copyright © 2023 by the author(s)
Published under license by Materials Research Forum LLC., Millersville PA, USA

Citation: Alessio Pricci, Gianluca Percoco, Non-Newtonian, non-isothermal three-dimensional modeling of strand deposition in screw-based material extrusion, Materials Research Proceedings, Vol. 35, pp 143-153, 2023

DOI: https://doi.org/10.21741/9781644902714-18

The article was published as article 18 of the book Italian Manufacturing Association Conference

Content from this work may be used under the terms of the Creative Commons Attribution 3.0 license. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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