Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos
Autor(a) principal: | |
---|---|
Data de Publicação: | 2021 |
Tipo de documento: | Dissertação |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.22/19552 |
Resumo: | Due to the limitations presented by conventional joining techniques, like bolted and welded joints, the industry has turned attention to adhesively-bonded joints. The lower weight and decreased stress concentrations are some of the advantages made possible by this technique. Over the years, diverse analytical and numerical approaches to the failure of these joints were investigated. The work presented in this report aims to propose and validate a fracture mechanics based approach to joint failure, named Intensity of Singular Stress Fields (ISSF). With this purpose, aluminium and composite single-lap joints bonded with a brittle adhesive were tested. Different overlap lengths (LO) were also considered in order to evaluate this parameter influence in the final results. The experimental data was treated and the average maximum loads sustained by the joints were collected. Then, a numerical method for joint strength prediction was proposed, consisting of a combination of experimental and numerical information. The numerical data was obtained through simulations resorting to the Finite Element Method (FEM) and a meshless technique, the Radial Point Interpolation Method (RPIM). The validation of the approach was achieved by analysing the polar stress components and comparing the experimental and numerical results. It was experimentally verified that increasing LO leads to an increase in strength of the joints. The proposed technique was successfully applied for both aluminium and composite adherends even though they had different formulations. The results attained with the proposed method were promising given itssimplicity compared with previously proposed methodologies. The method’s application to meshless methods was also confirmed since the RPIM presented very similar results to the FEM, despite presenting some oscillations. |
id |
RCAP_4675b0fc9502b8ae23baed0265e4aa7d |
---|---|
oai_identifier_str |
oai:recipp.ipp.pt:10400.22/19552 |
network_acronym_str |
RCAP |
network_name_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository_id_str |
7160 |
spelling |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricosIntensity of Singular Stress Fields CriterionComposite MaterialsAdhesive JointsRadial Point Interpolation MethodFinite Element MethodSingle-Lap JointsCritério da Intensidade dos Campos de Tensões SingularesMateriais CompósitosJuntas AdesivasRadial Point Interpolation MethodMétodo dos Elementos FinitosJuntas de Sobreposição SimplesMeshless MethodsDue to the limitations presented by conventional joining techniques, like bolted and welded joints, the industry has turned attention to adhesively-bonded joints. The lower weight and decreased stress concentrations are some of the advantages made possible by this technique. Over the years, diverse analytical and numerical approaches to the failure of these joints were investigated. The work presented in this report aims to propose and validate a fracture mechanics based approach to joint failure, named Intensity of Singular Stress Fields (ISSF). With this purpose, aluminium and composite single-lap joints bonded with a brittle adhesive were tested. Different overlap lengths (LO) were also considered in order to evaluate this parameter influence in the final results. The experimental data was treated and the average maximum loads sustained by the joints were collected. Then, a numerical method for joint strength prediction was proposed, consisting of a combination of experimental and numerical information. The numerical data was obtained through simulations resorting to the Finite Element Method (FEM) and a meshless technique, the Radial Point Interpolation Method (RPIM). The validation of the approach was achieved by analysing the polar stress components and comparing the experimental and numerical results. It was experimentally verified that increasing LO leads to an increase in strength of the joints. The proposed technique was successfully applied for both aluminium and composite adherends even though they had different formulations. The results attained with the proposed method were promising given itssimplicity compared with previously proposed methodologies. The method’s application to meshless methods was also confirmed since the RPIM presented very similar results to the FEM, despite presenting some oscillations.Devido às limitações das técnicas de ligação convencionais, tais como as ligações aparafusadas e a soldadura, a indústria virou a sua atenção para as juntas adesivas estruturais. O baixo peso e a redução das concentrações de tensões são algumas das vantagens inerentes a esta técnica. Ao longo dos anos foram investigadas diversas abordagens analíticas e numéricas relativas à fratura deste tipo de juntas. O presente trabalho tem como objetivo propor e validar um método baseado na mecânica da fratura para avaliar a falha destas juntas. Para o efeito, foram testadas juntas de sobreposição simples de alumínio e compósito ligadas por um adesivo frágil. Também foram considerados diferentes comprimentos de sobreposição (LO) de forma a avaliar a influência deste parâmetro nos resultados finais. Os dados experimentais foram tratados e foram recolhidas as cargas máximas médias suportadas pelas juntas. Posteriormente, foi proposto um método numérico para prever a resistência das juntas, que consiste na combinação de informação analítica e numérica. Os dados numéricos foram obtidos através de simulações recorrendo ao Método dos Elementos Finitos (MEF) e a uma técnica meshless, o Radial Point Interpolation Method (RPIM). A validação da abordagem foi conseguida através da análise das componentes polares das tensões e por comparação entre os resultados experimentais e analíticos. Verificou-se experimentalmente que um aumento do comprimento de sobreposição origina um aumento da resistência das juntas. A técnica foi aplicada com sucesso para aderentes de alumínio e de compósito mesmo apresentando formulações distintas. Os resultados obtidos com o método proposto foram promissores dada a simplicidade do mesmo quando comparado com metodologias previamente propostas. A aplicabilidade do método aos métodos sem malha também foi comprovada já que o RPIM apresentou resultados muito similares ao MEF, apesar de apresentar algumas oscilações.Campilho, Raul Duarte Salgueiral GomesRepositório Científico do Instituto Politécnico do PortoDionísio, João Manuel Maia2022-01-18T16:22:27Z20212021-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://hdl.handle.net/10400.22/19552TID:202796507enginfo: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:RCAAP2023-03-13T13:14:08Zoai:recipp.ipp.pt:10400.22/19552Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T17:39:35.474665Repositório 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 |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
title |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
spellingShingle |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos Dionísio, João Manuel Maia Intensity of Singular Stress Fields Criterion Composite Materials Adhesive Joints Radial Point Interpolation Method Finite Element Method Single-Lap Joints Critério da Intensidade dos Campos de Tensões Singulares Materiais Compósitos Juntas Adesivas Radial Point Interpolation Method Método dos Elementos Finitos Juntas de Sobreposição Simples Meshless Methods |
title_short |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
title_full |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
title_fullStr |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
title_full_unstemmed |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
title_sort |
Validação do critério ISSF aplicado a juntas adesivas usando métodos numéricos |
author |
Dionísio, João Manuel Maia |
author_facet |
Dionísio, João Manuel Maia |
author_role |
author |
dc.contributor.none.fl_str_mv |
Campilho, Raul Duarte Salgueiral Gomes Repositório Científico do Instituto Politécnico do Porto |
dc.contributor.author.fl_str_mv |
Dionísio, João Manuel Maia |
dc.subject.por.fl_str_mv |
Intensity of Singular Stress Fields Criterion Composite Materials Adhesive Joints Radial Point Interpolation Method Finite Element Method Single-Lap Joints Critério da Intensidade dos Campos de Tensões Singulares Materiais Compósitos Juntas Adesivas Radial Point Interpolation Method Método dos Elementos Finitos Juntas de Sobreposição Simples Meshless Methods |
topic |
Intensity of Singular Stress Fields Criterion Composite Materials Adhesive Joints Radial Point Interpolation Method Finite Element Method Single-Lap Joints Critério da Intensidade dos Campos de Tensões Singulares Materiais Compósitos Juntas Adesivas Radial Point Interpolation Method Método dos Elementos Finitos Juntas de Sobreposição Simples Meshless Methods |
description |
Due to the limitations presented by conventional joining techniques, like bolted and welded joints, the industry has turned attention to adhesively-bonded joints. The lower weight and decreased stress concentrations are some of the advantages made possible by this technique. Over the years, diverse analytical and numerical approaches to the failure of these joints were investigated. The work presented in this report aims to propose and validate a fracture mechanics based approach to joint failure, named Intensity of Singular Stress Fields (ISSF). With this purpose, aluminium and composite single-lap joints bonded with a brittle adhesive were tested. Different overlap lengths (LO) were also considered in order to evaluate this parameter influence in the final results. The experimental data was treated and the average maximum loads sustained by the joints were collected. Then, a numerical method for joint strength prediction was proposed, consisting of a combination of experimental and numerical information. The numerical data was obtained through simulations resorting to the Finite Element Method (FEM) and a meshless technique, the Radial Point Interpolation Method (RPIM). The validation of the approach was achieved by analysing the polar stress components and comparing the experimental and numerical results. It was experimentally verified that increasing LO leads to an increase in strength of the joints. The proposed technique was successfully applied for both aluminium and composite adherends even though they had different formulations. The results attained with the proposed method were promising given itssimplicity compared with previously proposed methodologies. The method’s application to meshless methods was also confirmed since the RPIM presented very similar results to the FEM, despite presenting some oscillations. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021 2021-01-01T00:00:00Z 2022-01-18T16:22:27Z |
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/10400.22/19552 TID:202796507 |
url |
http://hdl.handle.net/10400.22/19552 |
identifier_str_mv |
TID:202796507 |
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 |
|
_version_ |
1799131484129329152 |