Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/71817 |
Resumo: | Metallic cellular solids are a class of materials known for their high specific mechanical properties, being desirable in applications where a combination of high strength or stiffness and low density are important. These lightweight materials are often stochastic and manufactured by foaming or casting. If regular (periodic) lattice structures are desired, they may be manufactured by metallic additive manufacturing techniques. However, these have characteristic issues, such as un-melted powders, porosity and heterogeneous microstructures. This study reports a novel low-cost route for producing regular lattice structures by an additive manufacturing assisted investment casting technique. Fused filament fabrication is used to produce the lattice structure pattern which is infiltrated with plaster. The pattern is then burnt off and the aluminum is cast in vacuum. In this way we can manufacture non-stochastic metallic lattices having fine struts/ribs (0.6mm cross-section using a 0.4mm nozzle) and relative densities down to 0.036. X-ray micro computed tomography (μCT) showed that as-cast A356 Aluminium alloy frameworks have high dimensional tolerances and fine detail control. Frameworks based on units of six connected struts ranging from intruding (auxetic) to protruding (hexagonal) strut angles are studied. Vertical struts are finer than expected, reducing their moment of area which could impact their compressive strength. This new, low cost, route for producing high precision metallic cellular lattices offers an attractive alternative to other additive manufacturing techniques (e.g. selective laser and electron beam melting). |
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Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular latticesPeriodic latticeScaffoldFused filament fabricationInvestment castingEngenharia e Tecnologia::Engenharia MecânicaScience & TechnologyIndústria, inovação e infraestruturasMetallic cellular solids are a class of materials known for their high specific mechanical properties, being desirable in applications where a combination of high strength or stiffness and low density are important. These lightweight materials are often stochastic and manufactured by foaming or casting. If regular (periodic) lattice structures are desired, they may be manufactured by metallic additive manufacturing techniques. However, these have characteristic issues, such as un-melted powders, porosity and heterogeneous microstructures. This study reports a novel low-cost route for producing regular lattice structures by an additive manufacturing assisted investment casting technique. Fused filament fabrication is used to produce the lattice structure pattern which is infiltrated with plaster. The pattern is then burnt off and the aluminum is cast in vacuum. In this way we can manufacture non-stochastic metallic lattices having fine struts/ribs (0.6mm cross-section using a 0.4mm nozzle) and relative densities down to 0.036. X-ray micro computed tomography (μCT) showed that as-cast A356 Aluminium alloy frameworks have high dimensional tolerances and fine detail control. Frameworks based on units of six connected struts ranging from intruding (auxetic) to protruding (hexagonal) strut angles are studied. Vertical struts are finer than expected, reducing their moment of area which could impact their compressive strength. This new, low cost, route for producing high precision metallic cellular lattices offers an attractive alternative to other additive manufacturing techniques (e.g. selective laser and electron beam melting).European Research Council through the ERC grant CORREL-CT, number 695638 to enable VHC to visit the Henry Royce Institute to undertake the X-ray CT studies. This work was supported by the Henry Royce Institute for Advanced Materials, funded through EPSRC grants EP/R00661X/1, EP/S019367/1, EP/P025021/1 and EP/P025498/1. Also, this work was supported by Portuguese FCT, under the reference project UIDB/04436/2020. project iRAIL Innovation in Railway Systems and Technologies Doctoral Programme funds and by national funds through FCT - Portuguese Foundation for Science and Technology and was developed on the aim of the Doctoral grant PD/ BD/114096/2015.ElsevierUniversidade do MinhoCarneiro, Vítor Hugo PimentaRawson, S. D.Puga, HélderMeireles, JoséWithers, P.J.20202020-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/71817engCarneiro, V.H., Rawson, S.D., Puga, H., Meireles, J., Withers, P.J., Additive manufacturing assisted investment casting: A low-cost method to fabricate periodic metallic cellular lattices, Additive Manufacturing, Volume 33, 2020, 101085, ISSN 2214-8604, https://doi.org/10.1016/j.addma.2020.101085.2214-860410.1016/j.addma.2020.101085https://doi.org/10.1016/j.addma.2020.101085info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:31:07Zoai:repositorium.sdum.uminho.pt:1822/71817Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:26:21.342645Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
title |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
spellingShingle |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices Carneiro, Vítor Hugo Pimenta Periodic lattice Scaffold Fused filament fabrication Investment casting Engenharia e Tecnologia::Engenharia Mecânica Science & Technology Indústria, inovação e infraestruturas |
title_short |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
title_full |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
title_fullStr |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
title_full_unstemmed |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
title_sort |
Additive manufacturing assisted investment casting: a low-cost method to fabricate periodic metallic cellular lattices |
author |
Carneiro, Vítor Hugo Pimenta |
author_facet |
Carneiro, Vítor Hugo Pimenta Rawson, S. D. Puga, Hélder Meireles, José Withers, P.J. |
author_role |
author |
author2 |
Rawson, S. D. Puga, Hélder Meireles, José Withers, P.J. |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Carneiro, Vítor Hugo Pimenta Rawson, S. D. Puga, Hélder Meireles, José Withers, P.J. |
dc.subject.por.fl_str_mv |
Periodic lattice Scaffold Fused filament fabrication Investment casting Engenharia e Tecnologia::Engenharia Mecânica Science & Technology Indústria, inovação e infraestruturas |
topic |
Periodic lattice Scaffold Fused filament fabrication Investment casting Engenharia e Tecnologia::Engenharia Mecânica Science & Technology Indústria, inovação e infraestruturas |
description |
Metallic cellular solids are a class of materials known for their high specific mechanical properties, being desirable in applications where a combination of high strength or stiffness and low density are important. These lightweight materials are often stochastic and manufactured by foaming or casting. If regular (periodic) lattice structures are desired, they may be manufactured by metallic additive manufacturing techniques. However, these have characteristic issues, such as un-melted powders, porosity and heterogeneous microstructures. This study reports a novel low-cost route for producing regular lattice structures by an additive manufacturing assisted investment casting technique. Fused filament fabrication is used to produce the lattice structure pattern which is infiltrated with plaster. The pattern is then burnt off and the aluminum is cast in vacuum. In this way we can manufacture non-stochastic metallic lattices having fine struts/ribs (0.6mm cross-section using a 0.4mm nozzle) and relative densities down to 0.036. X-ray micro computed tomography (μCT) showed that as-cast A356 Aluminium alloy frameworks have high dimensional tolerances and fine detail control. Frameworks based on units of six connected struts ranging from intruding (auxetic) to protruding (hexagonal) strut angles are studied. Vertical struts are finer than expected, reducing their moment of area which could impact their compressive strength. This new, low cost, route for producing high precision metallic cellular lattices offers an attractive alternative to other additive manufacturing techniques (e.g. selective laser and electron beam melting). |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020 2020-01-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/71817 |
url |
http://hdl.handle.net/1822/71817 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Carneiro, V.H., Rawson, S.D., Puga, H., Meireles, J., Withers, P.J., Additive manufacturing assisted investment casting: A low-cost method to fabricate periodic metallic cellular lattices, Additive Manufacturing, Volume 33, 2020, 101085, ISSN 2214-8604, https://doi.org/10.1016/j.addma.2020.101085. 2214-8604 10.1016/j.addma.2020.101085 https://doi.org/10.1016/j.addma.2020.101085 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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