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Porosity in multi-axis material extrusion of short-fibre composites
journal contribution
posted on 2020-12-11, 11:42 authored by Nathaniel Kaill, Robert Campbell, Patrick PradelPatrick PradelPurpose - 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.
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 JournalVolume
27Issue
2Pages
362 - 370Publisher
EmeraldVersion
- AM (Accepted Manuscript)
Rights holder
© EmeraldPublisher 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-02-2020-0035Acceptance date
2020-11-27Publication date
2021-01-11Copyright date
2020ISSN
1355-2546Publisher version
Language
- en