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The International Journal of Advanced Manufacturing Technology
Published in: The International Journal of Advanced Manufacturing Technology 1-4/2019

23-07-2019 | ORIGINAL ARTICLE

Voxel-based support structures for additive manufacture of topologically optimal geometries

Authors: Martin Leary, Maciej Mazur, Marcus Watson, Etienne Boileau, Milan Brandt

Published in: The International Journal of Advanced Manufacturing Technology | Issue 1-4/2019

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Abstract

Additive manufacturing (AM) enables the direct manufacture of complex geometries with unique engineering properties. In particular, AM is compatible with topology optimisation (TO) and provides a unique opportunity for optimal structural design. Despite the commercial opportunities enabled by AM, technical requirements must be satisfied in order to achieve robust production outcomes. In particular, AM requires support structures to fabricate overhanging geometry and avoid overheating. Support generation tools exist; however, these are generally not directly compatible with the voxel-based representation typical of TO geometries, without additional computational steps. This research proposes the use of voxel-based Cellular automata (CA) as a fundamentally novel method for the generation of AM support structures. A number of CA rules are proposed and applied with the objective of generating robust support structures for an arbitrary TO geometry. Relevant CA parameters are assessed in terms of structure manufacturability, including sequential and random CA, rotation of the cellular array, and alternate CA boundary rules, including permutations not previously reported. From this research, CA with complex cell arrangements that provide robust AM support for TO geometries are identified and demonstrated by manufacture with selective laser melting (SLM) and fused deposition modelling (FDM). These CA may be automatically applied to enable TO geometries to be directly fabricated by AM, thereby providing a unique, and commercially significant, design for AM (DFAM) capability.
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Metadata
Title
Voxel-based support structures for additive manufacture of topologically optimal geometries
Authors
Martin Leary
Maciej Mazur
Marcus Watson
Etienne Boileau
Milan Brandt
Publication date
23-07-2019
Publisher
Springer London
Published in
The International Journal of Advanced Manufacturing Technology / Issue 1-4/2019
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI
https://doi.org/10.1007/s00170-019-03964-z

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