Nan, W, Pasha, M and Ghadiri, M orcid.org/0000-0003-0479-2845 (2020) Numerical simulation of particle flow and segregation during roller spreading process in additive manufacturing. Powder Technology, 364. pp. 811-821. ISSN 0032-5910
Abstract
Additive Manufacturing (AM) using powder spreading requires uniform spreading. For narrow spreader gaps, as commonly used, transient jamming and segregation could adversely affect the uniformity of the spread layer. Here, we consider the dynamics of powder spreading by roller for a gas-atomised metal powder and analyse the effects of gap height and the rotational speed of roller on the evolving particle trajectory and spread layer uniformity by Discrete Element Method. It is shown that transient jamming in narrow gaps and size segregation in the spreading heap, the latter brought about by particle convection/circulation, adversely affect the uniformity of the spread layer. The segregation extent decreases with the increase of gap height or decrease of roller rotational speed. The conditions for uniform spreading are deduced from the simulations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
Keywords: | Additive manufacturing; Powder spreading; Discrete element method; Particle convection; Segregation; Jamming |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 06 Feb 2020 13:28 |
Last Modified: | 25 Jun 2023 22:08 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.powtec.2019.12.023 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:156553 |