Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA)
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFSCAR |
Texto Completo: | https://repositorio.ufscar.br/handle/ufscar/899 |
Resumo: | Polymeric components have been replacing traditional materials such as glass or metals in a wide range of applications due to their advantages, such as optimized specific strength (weight-to-strength ratio), reduced fabrication time and costs, and design flexibility. The increasing use of polymeric materials in engineering requires efficient and environmental friendly fabrication and processing technologies. Initially developed for metals, the Friction Stir Spot Welding (FSSW) is a joining technique with short process cycles, low energy consumption and no need of consumables. Friction Stir Spot Welding has excellent performance in welding of lightweight alloys, showing promising results in thermoplastic welding. This study investigates the relationships between friction stir spot welding parameters (tool rotational speed, plunge rate and dwell time) and weld properties (joint geometry, process temperature, microstructure, lap shear resistance and failure mechanisms) in polymethylmethacrylate (also known as PMMA) single-spot joints. PMMA friction stir spot welds showed similar mechanical performance in comparison to other current welding techniques, with equal or shorter welding cycle times. Differential scanning calorimetry and gel permeation chromatography analysis demonstrated that polymer degradation level in the weld region was negligible. The statistical models proposed for FSSW of PMMA showed good repeatability and reproducibility for the investigated material and welding ranges. Moreover, the feasibility of the Friction Spot Welding (FSpW) a new joining technology developed as a further improvement of the friction stir spot welding was successfully demonstrated in thermoplastic polymers for the first time worldwide. Sound FSpW-single lap joints on PMMA were produced and their properties studied within an exploratory study. |
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Oliveira, Pedro Henrique Freiria deHage Júnior, Eliashttp://lattes.cnpq.br/1240692926327687http://lattes.cnpq.br/2263046505629088df0949f5-9baa-4130-af06-4ae4fbf2e08b2016-06-02T19:12:29Z2013-07-172016-06-02T19:12:29Z2012-10-05OLIVEIRA, Pedro Henrique Freiria de. Analysis of joint properties and mechanical evaluation friction spot welds of polymethyl-methacrylate (PMMA). 2012. 222 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2012.https://repositorio.ufscar.br/handle/ufscar/899Polymeric components have been replacing traditional materials such as glass or metals in a wide range of applications due to their advantages, such as optimized specific strength (weight-to-strength ratio), reduced fabrication time and costs, and design flexibility. The increasing use of polymeric materials in engineering requires efficient and environmental friendly fabrication and processing technologies. Initially developed for metals, the Friction Stir Spot Welding (FSSW) is a joining technique with short process cycles, low energy consumption and no need of consumables. Friction Stir Spot Welding has excellent performance in welding of lightweight alloys, showing promising results in thermoplastic welding. This study investigates the relationships between friction stir spot welding parameters (tool rotational speed, plunge rate and dwell time) and weld properties (joint geometry, process temperature, microstructure, lap shear resistance and failure mechanisms) in polymethylmethacrylate (also known as PMMA) single-spot joints. PMMA friction stir spot welds showed similar mechanical performance in comparison to other current welding techniques, with equal or shorter welding cycle times. Differential scanning calorimetry and gel permeation chromatography analysis demonstrated that polymer degradation level in the weld region was negligible. The statistical models proposed for FSSW of PMMA showed good repeatability and reproducibility for the investigated material and welding ranges. Moreover, the feasibility of the Friction Spot Welding (FSpW) a new joining technology developed as a further improvement of the friction stir spot welding was successfully demonstrated in thermoplastic polymers for the first time worldwide. Sound FSpW-single lap joints on PMMA were produced and their properties studied within an exploratory study.A busca por eficiência econômica e tecnologias ecologicamente corretas tem sido observada em praticamente todos os setores da produção industrial, desde o desenvolvimento de materiais, design de produtos e inclusive na área da soldagem. A soldagem ponto por fricção e mistura mecânica, FSSW (do inglês Friction Stir Spot Welding) e a Friction Spot Welding FSpW são técnicas de soldagem recentes e que têm sido amplamente empregadas na união de ligas metálicas leves, em que as soldas geralmente apresentam excelentes propriedades mecânicas. Além disso, ciclos de soldagem curtos, baixo consumo de energia e ausência de necessidade de adição de material ou elementos de soldagem são características positivas encontradas nesses novos processos. Na área de materiais poliméricos, entretanto, este é um novo e promissor assunto. Neste trabalho buscou-se investigar a relação entre os parâmetros do processo de soldagem por FSSW (velocidade de rotação da ferramenta, taxa de penetração e tempo de recalque) e as propriedades das juntas (geometria da solda, máxima temperatura processual, área afetada termicamente, resistência mecânica ao cisalhamento sob tensão e mecanismos de fratura) em placas de poli (metacrilato de metila). Foi possível observar a formação de juntas com resistência mecânica ao cisalhamento semelhante a outros processos atualmente utilizados na indústria, com tempos de ciclo de soldagem iguais ou inferiores a esses processos. As análises via calorimetria diferencial exploratória (DSC) e cromatografia por permeação em gel (GPC) demonstraram que os níveis de degradação termomecânica encontrados nas amostras foram insignificantes. A modelagem estatística do processo demonstrou a boa repetibilidade e reprodutibilidade dentro das condições estudadas. Nesse trabalho, também foi investigado através de um estudo exploratório, pela primeira vez, a viabilidade da nova técnica FSpW na soldagem de termoplásticos, demonstrando, com sucesso, a capacidade de obtenção de juntas de boa qualidade em PMMA.Universidade Federal de Minas Geraisapplication/pdfporUniversidade Federal de São CarlosPrograma de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEMUFSCarBRPlásticosSoldagemFSSWFSpWJunção de materiaisENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICAEstudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA)Analysis of joint properties and mechanical evaluation friction spot welds of polymethyl-methacrylate (PMMA)info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesis-1-1f1ae4772-6abc-474a-a0dc-4be6bc3d1282info:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFSCARinstname:Universidade Federal de São Carlos (UFSCAR)instacron:UFSCARORIGINAL5246.pdfapplication/pdf9799013https://repositorio.ufscar.br/bitstream/ufscar/899/1/5246.pdf4c1e1a4d482b5bbe3c75535359168a82MD51TEXT5246.pdf.txt5246.pdf.txtExtracted texttext/plain0https://repositorio.ufscar.br/bitstream/ufscar/899/2/5246.pdf.txtd41d8cd98f00b204e9800998ecf8427eMD52THUMBNAIL5246.pdf.jpg5246.pdf.jpgIM Thumbnailimage/jpeg6792https://repositorio.ufscar.br/bitstream/ufscar/899/3/5246.pdf.jpga7e9f5a39506f441738efeace21922abMD53ufscar/8992023-09-18 18:31:28.268oai:repositorio.ufscar.br:ufscar/899Repositório InstitucionalPUBhttps://repositorio.ufscar.br/oai/requestopendoar:43222023-09-18T18:31:28Repositório Institucional da UFSCAR - Universidade Federal de São Carlos (UFSCAR)false |
dc.title.por.fl_str_mv |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
dc.title.alternative.eng.fl_str_mv |
Analysis of joint properties and mechanical evaluation friction spot welds of polymethyl-methacrylate (PMMA) |
title |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
spellingShingle |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) Oliveira, Pedro Henrique Freiria de Plásticos Soldagem FSSW FSpW Junção de materiais ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
title_short |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
title_full |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
title_fullStr |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
title_full_unstemmed |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
title_sort |
Estudo das propriedades e desempenho mecânico de juntas soldadas por fricção pontual de poli (metacrilato de metila) (PMMA) |
author |
Oliveira, Pedro Henrique Freiria de |
author_facet |
Oliveira, Pedro Henrique Freiria de |
author_role |
author |
dc.contributor.authorlattes.por.fl_str_mv |
http://lattes.cnpq.br/2263046505629088 |
dc.contributor.author.fl_str_mv |
Oliveira, Pedro Henrique Freiria de |
dc.contributor.advisor1.fl_str_mv |
Hage Júnior, Elias |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/1240692926327687 |
dc.contributor.authorID.fl_str_mv |
df0949f5-9baa-4130-af06-4ae4fbf2e08b |
contributor_str_mv |
Hage Júnior, Elias |
dc.subject.por.fl_str_mv |
Plásticos Soldagem FSSW FSpW Junção de materiais |
topic |
Plásticos Soldagem FSSW FSpW Junção de materiais ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
dc.subject.cnpq.fl_str_mv |
ENGENHARIAS::ENGENHARIA DE MATERIAIS E METALURGICA |
description |
Polymeric components have been replacing traditional materials such as glass or metals in a wide range of applications due to their advantages, such as optimized specific strength (weight-to-strength ratio), reduced fabrication time and costs, and design flexibility. The increasing use of polymeric materials in engineering requires efficient and environmental friendly fabrication and processing technologies. Initially developed for metals, the Friction Stir Spot Welding (FSSW) is a joining technique with short process cycles, low energy consumption and no need of consumables. Friction Stir Spot Welding has excellent performance in welding of lightweight alloys, showing promising results in thermoplastic welding. This study investigates the relationships between friction stir spot welding parameters (tool rotational speed, plunge rate and dwell time) and weld properties (joint geometry, process temperature, microstructure, lap shear resistance and failure mechanisms) in polymethylmethacrylate (also known as PMMA) single-spot joints. PMMA friction stir spot welds showed similar mechanical performance in comparison to other current welding techniques, with equal or shorter welding cycle times. Differential scanning calorimetry and gel permeation chromatography analysis demonstrated that polymer degradation level in the weld region was negligible. The statistical models proposed for FSSW of PMMA showed good repeatability and reproducibility for the investigated material and welding ranges. Moreover, the feasibility of the Friction Spot Welding (FSpW) a new joining technology developed as a further improvement of the friction stir spot welding was successfully demonstrated in thermoplastic polymers for the first time worldwide. Sound FSpW-single lap joints on PMMA were produced and their properties studied within an exploratory study. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012-10-05 |
dc.date.available.fl_str_mv |
2013-07-17 2016-06-02T19:12:29Z |
dc.date.accessioned.fl_str_mv |
2016-06-02T19:12:29Z |
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.citation.fl_str_mv |
OLIVEIRA, Pedro Henrique Freiria de. Analysis of joint properties and mechanical evaluation friction spot welds of polymethyl-methacrylate (PMMA). 2012. 222 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2012. |
dc.identifier.uri.fl_str_mv |
https://repositorio.ufscar.br/handle/ufscar/899 |
identifier_str_mv |
OLIVEIRA, Pedro Henrique Freiria de. Analysis of joint properties and mechanical evaluation friction spot welds of polymethyl-methacrylate (PMMA). 2012. 222 f. Dissertação (Mestrado em Ciências Exatas e da Terra) - Universidade Federal de São Carlos, São Carlos, 2012. |
url |
https://repositorio.ufscar.br/handle/ufscar/899 |
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por |
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openAccess |
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application/pdf |
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Universidade Federal de São Carlos |
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Programa de Pós-Graduação em Ciência e Engenharia de Materiais - PPGCEM |
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UFSCar |
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BR |
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Universidade Federal de São Carlos |
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