Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures
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/10362/134774 |
Resumo: | In recent years there has been an increase of interest in 3D anepectic structures. An anepectic structure is a metamaterial with auxetic behaviour (Negative Poisson's Ratio (NPR)) and negative coefficient of thermal expansion (CTE). This work intends to manufacture and characterize a 3D anepectic structure using materials with positive CTE. A known auxetic structure was used, in which a second material was incorporated to obtain a negative CTE. To achieve the design used in this work, mechanical and thermal finite element simulations were performed to preview the thermomechanical behaviour. The 3D anepectic structures were produced by additive manufacturing using polyvinyl alcohol and Nylon. Two models with different designs were developed. Its characterization necessitated the development of new methodologies to determine the Poisson's ratio (PR) and CTE. One of the models obtained the intended anepectic behaviour. Furthermore, there was a correlation between PR values and the number of cells in the structure. Until this day, this is the first published report of a manufactured and characterized 3D anepectic structure, making this work innovative in the area of metamaterials. |
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Additive Manufacturing and Characterization of Three-dimensional Anepectic StructuresAnepecticAuxeticNegative Coefficient of Thermal ExpansionNegative Poisson's RatioAdditive Manufacturing3D StructuresDomínio/Área Científica::Engenharia e Tecnologia::Engenharia dos MateriaisIn recent years there has been an increase of interest in 3D anepectic structures. An anepectic structure is a metamaterial with auxetic behaviour (Negative Poisson's Ratio (NPR)) and negative coefficient of thermal expansion (CTE). This work intends to manufacture and characterize a 3D anepectic structure using materials with positive CTE. A known auxetic structure was used, in which a second material was incorporated to obtain a negative CTE. To achieve the design used in this work, mechanical and thermal finite element simulations were performed to preview the thermomechanical behaviour. The 3D anepectic structures were produced by additive manufacturing using polyvinyl alcohol and Nylon. Two models with different designs were developed. Its characterization necessitated the development of new methodologies to determine the Poisson's ratio (PR) and CTE. One of the models obtained the intended anepectic behaviour. Furthermore, there was a correlation between PR values and the number of cells in the structure. Until this day, this is the first published report of a manufactured and characterized 3D anepectic structure, making this work innovative in the area of metamaterials.Nos últimos anos tem existido um aumento de interesse em estruturas anepécticas 3D, isto é, auxéticas (Coeficiente de Poisson negativo (NPR)) e com coeficiente de expansão térmica (CTE) negativo. Este trabalho pretende manufaturar e caracterizar uma estrutura anepéctica 3D, constituída por materiais com CTE positivos. Foi utilizado uma estrutura auxética conhecida, no qual se incorporou um segundo material com o intuito de obter um CTE negativo. Para obter esse design, realizou-se simulação mecânica e térmica de elementos finitos. As estruturas anepécticas 3D foram produzidas por fabricação aditiva utilizando PVA e Nylon. Foi desenvolvido dois modelos com diferentes designs. Para a sua caraterização foi necessário desenvolver metodologias novas para a determinação do PR e do CTE. Sendo que um dos modelos obteve o comportamento anepéctico pretendido. Para além disso, verificouse uma correlação entre os valores de PR e o número de células na estrutura. Até à data, esta é a primeira publicação de uma estrutura anepéctica 3D manufaturada e caraterizada. Tornando este trabalho inovador na área dos metamateriais.Velhinho, AlexandreBorges, JoãoRUNCatatão, Gonçalo Miguel Rodrigues2022-08-22T00:31:34Z2022-02-222022-02-22T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/134774enginfo: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:RCAAP2024-03-11T05:13:15Zoai:run.unl.pt:10362/134774Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:48:14.178670Repositório 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 and Characterization of Three-dimensional Anepectic Structures |
title |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures |
spellingShingle |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures Catatão, Gonçalo Miguel Rodrigues Anepectic Auxetic Negative Coefficient of Thermal Expansion Negative Poisson's Ratio Additive Manufacturing 3D Structures Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
title_short |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures |
title_full |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures |
title_fullStr |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures |
title_full_unstemmed |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures |
title_sort |
Additive Manufacturing and Characterization of Three-dimensional Anepectic Structures |
author |
Catatão, Gonçalo Miguel Rodrigues |
author_facet |
Catatão, Gonçalo Miguel Rodrigues |
author_role |
author |
dc.contributor.none.fl_str_mv |
Velhinho, Alexandre Borges, João RUN |
dc.contributor.author.fl_str_mv |
Catatão, Gonçalo Miguel Rodrigues |
dc.subject.por.fl_str_mv |
Anepectic Auxetic Negative Coefficient of Thermal Expansion Negative Poisson's Ratio Additive Manufacturing 3D Structures Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
topic |
Anepectic Auxetic Negative Coefficient of Thermal Expansion Negative Poisson's Ratio Additive Manufacturing 3D Structures Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
description |
In recent years there has been an increase of interest in 3D anepectic structures. An anepectic structure is a metamaterial with auxetic behaviour (Negative Poisson's Ratio (NPR)) and negative coefficient of thermal expansion (CTE). This work intends to manufacture and characterize a 3D anepectic structure using materials with positive CTE. A known auxetic structure was used, in which a second material was incorporated to obtain a negative CTE. To achieve the design used in this work, mechanical and thermal finite element simulations were performed to preview the thermomechanical behaviour. The 3D anepectic structures were produced by additive manufacturing using polyvinyl alcohol and Nylon. Two models with different designs were developed. Its characterization necessitated the development of new methodologies to determine the Poisson's ratio (PR) and CTE. One of the models obtained the intended anepectic behaviour. Furthermore, there was a correlation between PR values and the number of cells in the structure. Until this day, this is the first published report of a manufactured and characterized 3D anepectic structure, making this work innovative in the area of metamaterials. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-08-22T00:31:34Z 2022-02-22 2022-02-22T00:00:00Z |
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/10362/134774 |
url |
http://hdl.handle.net/10362/134774 |
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 |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799138083934830592 |