Additive manufacturing of metallic auxetic structures for biomedical Applications
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/153466 |
Resumo: | Within the world of orthopedic implants for bone regeneration, metallic scaffolds have found their suitability overshadowed by issues regarding their high elastic modulus and stress shielding. Solving these issues poses not only an interesting challenge, due to their naturally high elastic modulus, but a worthwhile one given their application in healthcare. The advent and popularization of additive manufacturing technologies has, in its wake, enabled the man-ufacture of novel types of structures with tailored behaviors and porosity, allowing for their study and manufacturing as metallic materials. As such, in this work, structures based on the Schwarz P triply periodic minimal surface were modelled, manufactured from SS 316L and Ti-6Al-4V alloys by laser powder bed fusion, and characterized, with the intent of verifying if auxetic structures with properties relevant to biomedical application as bone scaffolding could be achieved. Results show that, although the Schwarz P geometry could be replicated, samples dis-played significant warping due to issues of heat dissipation during manufacturing. Further-more, samples exhibited relative densities below their modelled values with results demon-strating that the "a" parameter affects both sample geometry and density. The elastic modulus of samples was shown to increase with the sample's density, however the values obtained were significantly below their expected values for relative densities at 30% and above. All samples displayed quasi-auxetic behavior during testing. Though negative values for Pois-son's ratio could not be reached, values below 0.1 were obtained for all samples, implying the feasibility of this objective through further optimization of the structures. |
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Additive manufacturing of metallic auxetic structures for biomedical ApplicationsAdditive manufacturingL-PBFAuxetic materialsNegative Poisson's ratioMetamaterialsSchwarz PDomínio/Área Científica::Engenharia e Tecnologia::Engenharia dos MateriaisWithin the world of orthopedic implants for bone regeneration, metallic scaffolds have found their suitability overshadowed by issues regarding their high elastic modulus and stress shielding. Solving these issues poses not only an interesting challenge, due to their naturally high elastic modulus, but a worthwhile one given their application in healthcare. The advent and popularization of additive manufacturing technologies has, in its wake, enabled the man-ufacture of novel types of structures with tailored behaviors and porosity, allowing for their study and manufacturing as metallic materials. As such, in this work, structures based on the Schwarz P triply periodic minimal surface were modelled, manufactured from SS 316L and Ti-6Al-4V alloys by laser powder bed fusion, and characterized, with the intent of verifying if auxetic structures with properties relevant to biomedical application as bone scaffolding could be achieved. Results show that, although the Schwarz P geometry could be replicated, samples dis-played significant warping due to issues of heat dissipation during manufacturing. Further-more, samples exhibited relative densities below their modelled values with results demon-strating that the "a" parameter affects both sample geometry and density. The elastic modulus of samples was shown to increase with the sample's density, however the values obtained were significantly below their expected values for relative densities at 30% and above. All samples displayed quasi-auxetic behavior during testing. Though negative values for Pois-son's ratio could not be reached, values below 0.1 were obtained for all samples, implying the feasibility of this objective through further optimization of the structures.Dentro dos implantes ortopédicos para regeneração óssea, implantes metálicos tende-ram a ter a sua aptidão obscurecida por problemas relacionados com o seu elevando módulo de elasticidade e com o fenómeno de "stress-shielding". Resolver estes problemas apresenta-se não só como um problema interessante, devido aos seus módulos de elasticidade natural-mente altos, mas de particular mérito devido às implicações na área da saúde. A introdução e popularização das técnicas de manufatura aditiva têm, no seu desenvolvimento, permitido a produção de novos tipos de estruturas com comportamentos e porosidade personalizados, permitindo a sua criação e estudo como materiais metálicos. Assim, neste trabalho, estruturas baseadas na superfície mínima, triplamente periódica, Schwarz P foram modeladas, produzi-das nas ligas SS 316L e Ti-6Al-4V por laser powder bed fusion e caracterizadas, com a intenção de verificar se estruturas auxéticas com propriedades relevantes a aplicações biomédicas como implantes ósseos podiam ser obtidas. Apesar da geometria Schwarz P ter sido replicada com sucesso, verificou-se deformação significativa em todas as amostras devido a problemas de dissipação de calor. As amostras apresentaram densidades relativas abaixo dos valores modelados com os resultados a de-monstrarem que o parâmetro "a" afeta a geometria e densidade relativa da amostra. O módulo de elasticidade das estruturas aumentou com a densidade relativa, contudo, os valores per-maneceram abaixo do esperado para densidades relativa de 30% e acima. Todas as amostras apresentaram um comportamento quase auxético. Apesar de não serem atingidos coeficientes de Poisson negativos, os valores abaixo de 0.1 obtidos para todas as amostras indicam a viabi-lidade deste objetivo através de futuras otimizações da estrutura.Borges, JoãoBatalha, RodolfoRUNVilhena, Iuri David Deus2023-06-02T13:28:36Z2022-112022-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/153466enginfo: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:RCAAP2024-03-11T05:35:55Zoai:run.unl.pt:10362/153466Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:55:15.961901Repositório 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 of metallic auxetic structures for biomedical Applications |
title |
Additive manufacturing of metallic auxetic structures for biomedical Applications |
spellingShingle |
Additive manufacturing of metallic auxetic structures for biomedical Applications Vilhena, Iuri David Deus Additive manufacturing L-PBF Auxetic materials Negative Poisson's ratio Metamaterials Schwarz P Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
title_short |
Additive manufacturing of metallic auxetic structures for biomedical Applications |
title_full |
Additive manufacturing of metallic auxetic structures for biomedical Applications |
title_fullStr |
Additive manufacturing of metallic auxetic structures for biomedical Applications |
title_full_unstemmed |
Additive manufacturing of metallic auxetic structures for biomedical Applications |
title_sort |
Additive manufacturing of metallic auxetic structures for biomedical Applications |
author |
Vilhena, Iuri David Deus |
author_facet |
Vilhena, Iuri David Deus |
author_role |
author |
dc.contributor.none.fl_str_mv |
Borges, João Batalha, Rodolfo RUN |
dc.contributor.author.fl_str_mv |
Vilhena, Iuri David Deus |
dc.subject.por.fl_str_mv |
Additive manufacturing L-PBF Auxetic materials Negative Poisson's ratio Metamaterials Schwarz P Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
topic |
Additive manufacturing L-PBF Auxetic materials Negative Poisson's ratio Metamaterials Schwarz P Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
description |
Within the world of orthopedic implants for bone regeneration, metallic scaffolds have found their suitability overshadowed by issues regarding their high elastic modulus and stress shielding. Solving these issues poses not only an interesting challenge, due to their naturally high elastic modulus, but a worthwhile one given their application in healthcare. The advent and popularization of additive manufacturing technologies has, in its wake, enabled the man-ufacture of novel types of structures with tailored behaviors and porosity, allowing for their study and manufacturing as metallic materials. As such, in this work, structures based on the Schwarz P triply periodic minimal surface were modelled, manufactured from SS 316L and Ti-6Al-4V alloys by laser powder bed fusion, and characterized, with the intent of verifying if auxetic structures with properties relevant to biomedical application as bone scaffolding could be achieved. Results show that, although the Schwarz P geometry could be replicated, samples dis-played significant warping due to issues of heat dissipation during manufacturing. Further-more, samples exhibited relative densities below their modelled values with results demon-strating that the "a" parameter affects both sample geometry and density. The elastic modulus of samples was shown to increase with the sample's density, however the values obtained were significantly below their expected values for relative densities at 30% and above. All samples displayed quasi-auxetic behavior during testing. Though negative values for Pois-son's ratio could not be reached, values below 0.1 were obtained for all samples, implying the feasibility of this objective through further optimization of the structures. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-11 2022-11-01T00:00:00Z 2023-06-02T13:28:36Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10362/153466 |
url |
http://hdl.handle.net/10362/153466 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
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.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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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) |
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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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