Laser powder bed fusion process parameters for the fabrication of unsupported overhang structures of metamaterial lattices
Loading...
Date
Authors
Wits, W.W.
Vos, C.J. de
Montero Sistiaga, M.L.
Smit, M.J. de
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
License Holder
© 2025 The Author(s). Published by Elsevier Ltd on behalf of CIRP
Licence Type
CC BY license (http://creativecommons.org/licenses/by/4.0/)
Sponsor
This research was funded from the EU’s Horizon Europe Research and Innovation Programme under Grant Agreement No. 101046835. This paper does not necessarily reflect the views of the European Commission.
Abstract
Laser powder bed fusion of unsupported overhang structures, required for metamaterial lattices, are difficult to manufacture. In this study, process parameters are experimentally determined to successfully fabricate auxetic re-entrant metamaterial structures. Due to the support-less printing, higher linear energy densities compared to contour and hatch scanning are required to build continuously solidified overhang structures. Simulation results show that the melt pool width and in particular the length is enlarged, promoting loose powder attachment by denudation and balling. Auxetic re-entrant metamaterials are successfully fabricated. Impact tests show good mechanical performance and better energy absorption compared to previous studies.
Description
Keywords
Citation
Wessel W. Wits, Camill de Vos, Maria Montero-Sistiaga, Marc de Smit, Laser powder bed fusion process parameters for the fabrication of unsupported overhang structures of metamaterial lattices, CIRP Annals, Volume 74, Issue 1, 2025, Pages 309-313, ISSN 0007-8506, https://doi.org/10.1016/j.cirp.2025.03.003