Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10362/97146 |
Resumo: | An anepectic material is a metamaterial which simultaneously exhibits a negative coefficient of thermal expansion (CTE) and a negative Poisson coefficient. These meshes may be applied in situations where a response to a thermal stimulus is desired, such as in the aerospace and medical fields. In the current work, anepectic composite meshes, made from ABS and NiTi alloys, were fabricated with the aid of an additive manufacturing technique and subsequently characterized. Seven different mesh designs or material combinations were tested. In every case, a common passive part consists of ABS. A complementary active part, consisting of NiTi wire, differed from case to case, whether in terms of the particular behavior demonstrated (shape memory effect [SME] an/or superelasticity [SE]), the temperature of the relevant phase transformation, the geometry adopted, or the diameter used. All meshes were tested in a silicone bath, and their CTE was measured. The results showed that, under careful parameter selection it is possible to achieve an anepectic effect by combining ABS with SME or SE wires. The mesh that showed to have a more negative CTE (-3008 x 10-6 ºC-1) combined SME wires with SE wires. With such combination, it was possible to activate the mesh bellow the glass transition of the polymer, at 38ºC. For one of the seven fabricated meshes, cyclic tests of three heating and cooling were performed. But only during the first cycle could the anepectic behavior be preserved, the CTE becoming positive on the remaining cycles. Finite element simulation was also performed, where both positive and negative mesh displacements were verified. |
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Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy3D printingAnepecticAuxeticNegative Thermal ExpansionNiTi alloysShape Memory AlloysDomínio/Área Científica::Engenharia e Tecnologia::Engenharia dos MateriaisAn anepectic material is a metamaterial which simultaneously exhibits a negative coefficient of thermal expansion (CTE) and a negative Poisson coefficient. These meshes may be applied in situations where a response to a thermal stimulus is desired, such as in the aerospace and medical fields. In the current work, anepectic composite meshes, made from ABS and NiTi alloys, were fabricated with the aid of an additive manufacturing technique and subsequently characterized. Seven different mesh designs or material combinations were tested. In every case, a common passive part consists of ABS. A complementary active part, consisting of NiTi wire, differed from case to case, whether in terms of the particular behavior demonstrated (shape memory effect [SME] an/or superelasticity [SE]), the temperature of the relevant phase transformation, the geometry adopted, or the diameter used. All meshes were tested in a silicone bath, and their CTE was measured. The results showed that, under careful parameter selection it is possible to achieve an anepectic effect by combining ABS with SME or SE wires. The mesh that showed to have a more negative CTE (-3008 x 10-6 ºC-1) combined SME wires with SE wires. With such combination, it was possible to activate the mesh bellow the glass transition of the polymer, at 38ºC. For one of the seven fabricated meshes, cyclic tests of three heating and cooling were performed. But only during the first cycle could the anepectic behavior be preserved, the CTE becoming positive on the remaining cycles. Finite element simulation was also performed, where both positive and negative mesh displacements were verified.Fernandes, FranciscoVelhinho, AlexandreRUNMarcelino, Inês Margarida Neves2020-05-04T11:23:42Z2019-1120192019-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10362/97146enginfo: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:RCAAP2024-03-11T04:44:23Zoai:run.unl.pt:10362/97146Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:38:41.179Repositório 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 Fabrication of Anepectic Meshes controlled by a NiTi alloy |
title |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy |
spellingShingle |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy Marcelino, Inês Margarida Neves 3D printing Anepectic Auxetic Negative Thermal Expansion NiTi alloys Shape Memory Alloys Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
title_short |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy |
title_full |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy |
title_fullStr |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy |
title_full_unstemmed |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy |
title_sort |
Additive Fabrication of Anepectic Meshes controlled by a NiTi alloy |
author |
Marcelino, Inês Margarida Neves |
author_facet |
Marcelino, Inês Margarida Neves |
author_role |
author |
dc.contributor.none.fl_str_mv |
Fernandes, Francisco Velhinho, Alexandre RUN |
dc.contributor.author.fl_str_mv |
Marcelino, Inês Margarida Neves |
dc.subject.por.fl_str_mv |
3D printing Anepectic Auxetic Negative Thermal Expansion NiTi alloys Shape Memory Alloys Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
topic |
3D printing Anepectic Auxetic Negative Thermal Expansion NiTi alloys Shape Memory Alloys Domínio/Área Científica::Engenharia e Tecnologia::Engenharia dos Materiais |
description |
An anepectic material is a metamaterial which simultaneously exhibits a negative coefficient of thermal expansion (CTE) and a negative Poisson coefficient. These meshes may be applied in situations where a response to a thermal stimulus is desired, such as in the aerospace and medical fields. In the current work, anepectic composite meshes, made from ABS and NiTi alloys, were fabricated with the aid of an additive manufacturing technique and subsequently characterized. Seven different mesh designs or material combinations were tested. In every case, a common passive part consists of ABS. A complementary active part, consisting of NiTi wire, differed from case to case, whether in terms of the particular behavior demonstrated (shape memory effect [SME] an/or superelasticity [SE]), the temperature of the relevant phase transformation, the geometry adopted, or the diameter used. All meshes were tested in a silicone bath, and their CTE was measured. The results showed that, under careful parameter selection it is possible to achieve an anepectic effect by combining ABS with SME or SE wires. The mesh that showed to have a more negative CTE (-3008 x 10-6 ºC-1) combined SME wires with SE wires. With such combination, it was possible to activate the mesh bellow the glass transition of the polymer, at 38ºC. For one of the seven fabricated meshes, cyclic tests of three heating and cooling were performed. But only during the first cycle could the anepectic behavior be preserved, the CTE becoming positive on the remaining cycles. Finite element simulation was also performed, where both positive and negative mesh displacements were verified. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-11 2019 2019-11-01T00:00:00Z 2020-05-04T11:23:42Z |
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/10362/97146 |
url |
http://hdl.handle.net/10362/97146 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
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openAccess |
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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) |
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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1799138003631734784 |