Design and Characterization of an Adhesive for T-Joint Composite
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.6/10587 |
Resumo: | With the increase in composites usage in aeronautical structures and with it, the use of Carbon-Fiber Reinforced Polymers (CFRP), there was also an increase in the use of diverse types of joints, being one of the most common the T-joints. The bonding method that has gained a lot of attention is the adhesive bonding, but its optimization requires an understanding of its behavior with different types of service conditions. In this work, the aeronautical structural adhesive film SEAL® EA451 U150 was characterized at 3-point bending using different strain-rates, stress relaxation and creep behavior. The adhesive was subjected to different temperatures while immersed in water and the degradation of properties (mechanical and viscoelastic) were evaluated. Finally, this adhesive was used in T-joints and Stiffener Pull-Off Tests (SPOT) were conducted in order to understand the effect of exposure to temperature and moisture on the failure mode. The results show that: the mechanical properties in 3-point bending of the adhesive depend on the service conditions: -it was observed that the ultimate stress strength and the elastic modulus increase with the strain-rate; - for a load of 60 % of the ultimate stress strength after 180 minutes the stress decrease is inferior to 10 %. After suffering environmental degradation, the adhesive decreases its ultimate stress strength (from 109 to 62 N) and decreases its maximum strain (from 3.4 to 1.8 %), T-joints in SPOT have a progressive failure mode (non-abrupt) and when subjected to environmental degradation present a reduction of maximum load of ~8%, but with an increase of ~18 % in deformation |
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Design and Characterization of an Adhesive for T-Joint CompositeAdesivo EstruturalCfrpDegradação AmbientalJuntas Em TModo de FalhaPropriedades MecânicasSpotDomínio/Área Científica::Engenharia e Tecnologia::Engenharia AeronáuticaWith the increase in composites usage in aeronautical structures and with it, the use of Carbon-Fiber Reinforced Polymers (CFRP), there was also an increase in the use of diverse types of joints, being one of the most common the T-joints. The bonding method that has gained a lot of attention is the adhesive bonding, but its optimization requires an understanding of its behavior with different types of service conditions. In this work, the aeronautical structural adhesive film SEAL® EA451 U150 was characterized at 3-point bending using different strain-rates, stress relaxation and creep behavior. The adhesive was subjected to different temperatures while immersed in water and the degradation of properties (mechanical and viscoelastic) were evaluated. Finally, this adhesive was used in T-joints and Stiffener Pull-Off Tests (SPOT) were conducted in order to understand the effect of exposure to temperature and moisture on the failure mode. The results show that: the mechanical properties in 3-point bending of the adhesive depend on the service conditions: -it was observed that the ultimate stress strength and the elastic modulus increase with the strain-rate; - for a load of 60 % of the ultimate stress strength after 180 minutes the stress decrease is inferior to 10 %. After suffering environmental degradation, the adhesive decreases its ultimate stress strength (from 109 to 62 N) and decreases its maximum strain (from 3.4 to 1.8 %), T-joints in SPOT have a progressive failure mode (non-abrupt) and when subjected to environmental degradation present a reduction of maximum load of ~8%, but with an increase of ~18 % in deformationCom o aumento do uso de compósitos em estruturas aeronáuticas, em particular matrizes poliméricas reforçadas com fibras de carbono (CFRP), também aumenta o uso de diversos tipos de juntas, sendo uma das mais comuns as juntas em T. O sistema de união com maior interesse são os adesivos estruturais, mas a otimização do seu uso requer a compreensão do seu comportamento em diferentes condições de solicitação. Neste trabalho, o adesivo estrutural aeronáutico na forma de filme SEAL® EA451 U150, foi caracterizado à flexão em 3 pontos usando diferentes velocidades de ensaio, à relaxação de tensões e à fluência. O adesivo foi exposto a temperaturas de 20ºC, 40ºC e 80ºC, imerso em água e a degradação das propriedades mecânicas (estáticas e viscoelásticas) foram avaliadas. Finalmente, este adesivo foi usado em juntas em T e foram realizados ensaios de arrancamento (SPOT) por forma a compreender o efeito da exposição à temperatura e humidade nos mecanismos de ruína dominantes. Os resultados mostram que: as propriedades mecânicas em flexão em 3 pontos do adesivo dependem das condições de solicitação: -observou-se que a resistência mecânica (tensão) e o módulo de elasticidade aumentam com a velocidade de ensaio; -para uma carga de 60 % da tensão de rutura após 180 minutos a redução de carga é inferior a 10 %. Após a degradação ambiental verifica-se que o adesivo perde resistência (de 109 para 62 N) e diminui a deformação (de 3,4 para 1,8 %). As juntas em T nos ensaios SPOT têm um mecanismo de ruína progressivo (não abrupto) e quando sujeitas a degradação ambiental apresentam uma redução na carga máxima de ~8 %, mas um aumento na deformação de ~18 %.Silva, Abílio Manuel Pereira dauBibliorumValente, Hugo Micael Santos2022-06-23T00:30:18Z2020-07-242020-06-252020-07-24T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.6/10587TID:202547272enginfo: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:RCAAP2023-12-15T09:52:30Zoai:ubibliorum.ubi.pt:10400.6/10587Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:50:30.650970Repositório 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 |
Design and Characterization of an Adhesive for T-Joint Composite |
title |
Design and Characterization of an Adhesive for T-Joint Composite |
spellingShingle |
Design and Characterization of an Adhesive for T-Joint Composite Valente, Hugo Micael Santos Adesivo Estrutural Cfrp Degradação Ambiental Juntas Em T Modo de Falha Propriedades Mecânicas Spot Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Aeronáutica |
title_short |
Design and Characterization of an Adhesive for T-Joint Composite |
title_full |
Design and Characterization of an Adhesive for T-Joint Composite |
title_fullStr |
Design and Characterization of an Adhesive for T-Joint Composite |
title_full_unstemmed |
Design and Characterization of an Adhesive for T-Joint Composite |
title_sort |
Design and Characterization of an Adhesive for T-Joint Composite |
author |
Valente, Hugo Micael Santos |
author_facet |
Valente, Hugo Micael Santos |
author_role |
author |
dc.contributor.none.fl_str_mv |
Silva, Abílio Manuel Pereira da uBibliorum |
dc.contributor.author.fl_str_mv |
Valente, Hugo Micael Santos |
dc.subject.por.fl_str_mv |
Adesivo Estrutural Cfrp Degradação Ambiental Juntas Em T Modo de Falha Propriedades Mecânicas Spot Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Aeronáutica |
topic |
Adesivo Estrutural Cfrp Degradação Ambiental Juntas Em T Modo de Falha Propriedades Mecânicas Spot Domínio/Área Científica::Engenharia e Tecnologia::Engenharia Aeronáutica |
description |
With the increase in composites usage in aeronautical structures and with it, the use of Carbon-Fiber Reinforced Polymers (CFRP), there was also an increase in the use of diverse types of joints, being one of the most common the T-joints. The bonding method that has gained a lot of attention is the adhesive bonding, but its optimization requires an understanding of its behavior with different types of service conditions. In this work, the aeronautical structural adhesive film SEAL® EA451 U150 was characterized at 3-point bending using different strain-rates, stress relaxation and creep behavior. The adhesive was subjected to different temperatures while immersed in water and the degradation of properties (mechanical and viscoelastic) were evaluated. Finally, this adhesive was used in T-joints and Stiffener Pull-Off Tests (SPOT) were conducted in order to understand the effect of exposure to temperature and moisture on the failure mode. The results show that: the mechanical properties in 3-point bending of the adhesive depend on the service conditions: -it was observed that the ultimate stress strength and the elastic modulus increase with the strain-rate; - for a load of 60 % of the ultimate stress strength after 180 minutes the stress decrease is inferior to 10 %. After suffering environmental degradation, the adhesive decreases its ultimate stress strength (from 109 to 62 N) and decreases its maximum strain (from 3.4 to 1.8 %), T-joints in SPOT have a progressive failure mode (non-abrupt) and when subjected to environmental degradation present a reduction of maximum load of ~8%, but with an increase of ~18 % in deformation |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-07-24 2020-06-25 2020-07-24T00:00:00Z 2022-06-23T00:30:18Z |
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/10400.6/10587 TID:202547272 |
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http://hdl.handle.net/10400.6/10587 |
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TID:202547272 |
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eng |
language |
eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
dc.source.none.fl_str_mv |
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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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