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Porosity in multi-axis material extrusion of short-fibre composites

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journal contribution
posted on 11.12.2020, 11:42 by Nathaniel Kaill, Robert Campbell, Patrick Pradel
Purpose - This study aims to investigate the relationship between part porosity and mechanical properties of short-fibre reinforced PLA printed via Multi-Axis Material Extrusion (MAMEX) to establish guidelines for optimal process configurations.
Design/methodology/approach - Material properties graphs provide the basis for studying the relationship between porosity and mechanical behaviour. Using the correlations found in this study, the way to improve printing strategies and filament properties can be deducted directly from an analysis of the print path and the final influence on mechanical performance.
Findings – Some commercial brands of short-fibre reinforced filament present inherent porosity that weakens the mechanical behaviour of MAMEX components.
Originality/value – Low-cost MAMEX allows the production of components that do not present anisotropic behaviour and are mechanically optimised through the alignment of the filaments along with internal stresses. This paper also addresses the effects of multi-axis deposition strategies on the resulting porosity and proposes improvements to reduce residual porosity, thus increasing the mechanical performance in the future.

Funding

European Commission as part of the DiCoMI project (Grant agreement ID: 778068)

History

School

  • Design and Creative Arts

Department

  • Design

Published in

Rapid Prototyping Journal

Volume

27

Issue

2

Pages

362 - 370

Publisher

Emerald

Version

AM (Accepted Manuscript)

Rights holder

© Emerald

Publisher statement

This paper was accepted for publication in the journal Rapid Prototyping Journal and the definitive published version is available at https://doi.org/10.1108/RPJ-02-2020-0035

Acceptance date

27/11/2020

Publication date

2021-01-11

Copyright date

2020

ISSN

1355-2546

Language

en

Depositor

Dr Patrick Pradel Deposit date: 7 December 2020

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