Geometric void-multiscale model for evaluating the effect of bead width and layer height on voids in FDM parts
ISSN: 1355-2546
Article publication date: 2 May 2023
Issue publication date: 10 August 2023
Abstract
Purpose
This paper aims to present a geometrical void model in conjunction with a multiscale method to evaluate the effect of interraster distance, bead (raster) width and layer height, on the voids concentration (volume) and subsequently calculate the final mechanical properties of the fused deposition modeling parts at constant infill.
Design/methodology/approach
A geometric model of the voids inside the representative volume element (RVE) is combined with a two-scale asymptotic homogenization method. The RVEs are subjected to periodic boundary conditions solved by finite element (FE) to calculate the effective mechanical properties of the corresponding RVEs. The results are validated with literature and experiments.
Findings
Bead width from 0.2 to 0.3 mm, reported a decrease of 25% and 24% void volume for a constant layer height (0.1 and 0.2 mm – 75% infill). It is reported that the void’s volume increased up to 14%, 32% and 36% for 75%, 50% and 25% infill by varying layer height (0.1–0.2 and 0.3 mm), respectively. For elastic modulus, 14%, 9% and 10% increase is reported when the void’s volume is decreased from 0.3 to 0.1 mm at a constant 75% infill density. The bead width and layer height have an inverse effect on voids volume.
Originality/value
This work brings values: a multiscale-geometric model capable of predicting the voids controllability by varying interraster distance, layer height and bead width. The idealized RVE generation slicer software and Solidworks save time and cost (<10 min, $0). The proposed model can effectively compute the mechanical properties together with the voids analysis.
Keywords
Acknowledgements
The funding received for this research from The National Science and Engineering Research Council of Canada (NSERC under grant RGPIN-217525) as well as the support from the Advanced Research Laboratory Multifunctional Lightweight Structures (ARL-MLS), University of Toronto, is greatly acknowledged.
Credit authorship contribution statement.
Declaration of competing interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Data availability statement: The data required to reproduce these findings cannot be shared at this time due to technicality and confidentiality of the project. The method for generating/reproducing the data used for this analysis is documented in the main text. The analyses methods themselves are documented in full in the text, and in cited references which can be used to reproduce the findings.
Citation
Sheikh, T. and Behdinan, K. (2023), "Geometric void-multiscale model for evaluating the effect of bead width and layer height on voids in FDM parts", Rapid Prototyping Journal, Vol. 29 No. 8, pp. 1565-1579. https://doi.org/10.1108/RPJ-01-2023-0013
Publisher
:Emerald Publishing Limited
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