Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-10-02T23:44:17Z No. of bitstreams: 1 AmandaGoncalvesCavalcante_DISSERT.pdf: 2863796 bytes, checksum: fb2416c18becb76bd35ed0b21f5cd0e2 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-10-09T20:53:35Z (GMT) No. of bitstreams: 1 AmandaGoncalvesCavalcante_DISSERT.pdf: 2863796 bytes, checksum: fb2416c18becb76bd35ed0b21f5cd0e2 (MD5) / Made available in DSpace on 2017-10-09T20:53:35Z (GMT). No. of bitstreams: 1 AmandaGoncalvesCavalcante_DISSERT.pdf: 2863796 bytes, checksum: fb2416c18becb76bd35ed0b21f5cd0e2 (MD5) Previous issue date: 2017-07-21 / O descarte de pneus no meio ambiente na forma de res?duo vem causando grandes problemas e impactos ambientais. Sendo assim, este trabalho apresenta a obten??o e estudo da caracteriza??o de um material comp?sito, voltado para a fabrica??o de um absorvedor de impacto de para-choque automotivo. Esse material foi fabricado com resina matriz de poliuretano (PU) ? base de petr?leo e carga de res?duos de pneu, oriundos do processo de recauchutagem. Para tanto, cinco formula??es com diferentes percentuais de res?duo de pneu (0%, 30%, 45%, 70% e 100%) foram obtidas e caracterizadas no que se refere ?s suas propriedades mec?nicas, t?rmicas, de absor??o de umidade, densidade e degrada??o pela sua exposi??o ?s intemp?ries. Al?m disso, foram realizados os ensaio de Microscopia Eletr?nica de Varredura (MEV) e Espectroscopia de Energia Dispersiva (EDS) no material para que se pudesse observar sua microestrutura (distribui??o de res?duos na matriz, vazios, imperfei??es e impurezas) e identificar os elementos qu?micos presentes, respectivamente. Como resultado geral, os comp?sitos apresentaram um aumento na sua densidade conforme se aumentava o percentual de res?duo de pneu, assim como a condutividade t?rmica. Quanto ?s propriedades mec?nicas, a formula??o que teve maior resist?ncia ? tra??o, flex?o e compress?o foi a de 45% e a de maior resist?ncia ao impacto foi a de 100%. Com rela??o ? resist?ncia ao envelhecimento a formula??o de 100% foi a que obteve melhor desempenho. Foi fabricado um absorvedor de para-choque com a formula??o de 45% que apresentou um acr?scimo de massa de 28,03%, demonstrando-se a viabilidade de fabrica??o desse componente automotivo. / The disposal of tires in the environment in the form of waste is causing major problems and environmental impacts. Thus, this work presents the study and the characterization of a composite material, aimed at the manufacture of an automotive bumper absorber. This material was manufactured with petroleum based polyurethane (PU) matrix resin and tire residue loading, from the retread process. Five formulations with different percentages of tire residue (0%, 30%, 45%, 70% and 100%) were obtained and characterized with respect to their mechanical and thermal properties, moisture absorption, density and degradation by exposure to the elements. Scanning Electron Microscopy (SEM) and Dispersive Energy Spectroscopy (EDS) tests were also performed on the material so that its microstructure could be observed (distribution of residues in the matrix, voids, imperfections and impurities) and to identify the chemical elements present , respectively. As a general result, the composites presented an increase in their density as the percentage of tire residue increased, as well as the thermal conductivity. As for the mechanical properties, the formulation with the highest tensile, flexural and compression strength was 45% and the one with the highest impact strength was 100%. Regarding the resistance to aging the formulation of 100% was the one that obtained better performance. A bumper absorber was manufactured with the 45% formulation, which presented a mass increase of 28.03%, demonstrating the feasibility of manufacturing this automotive component.

Made available in DSpace on 2014-12-17T14:06:56Z (GMT). No. of bitstreams: 1 EugenioOO_DISSERT.pdf: 4689753 bytes, checksum: 3bf8e997d1b94d1858f0a0c5652f05b0 (MD5) Previous issue date: 2010-11-19 / Pipelines for the transport of crude oil from the production wells to the collecting stations are named production lines . These pipes are subjected to chemical and electrochemical corrosion according to the environment and the type of petroleum transported. Some of these lines, depending upon the composition of the fluid produced, may leak within less than one year of operation due to internal corrosion. This work aims at the development of composite pipes with an external protecting layer of high density polyurethane for use in production lines of onshore oil wells, meeting operational requirements. The pipes were manufactured using glass fibers, epoxy resin, polyester resin, quartz sand and high density polyurethane. The pipes were produced by filament winding with the deposition of high density polyurethane on the external surface and threaded ends (API 15 HR/PM-VII). Three types of pipes were manufactured: glass/epoxy, glass/epoxy with an external polyurethane layer and glass/epoxy with an intermediate layer of glass fiber, polyester, sand and with an external polyurethane layer. The three samples were characterized by Scanning Electronic Microscopy (SEM) and for the determination of constituent content. In addition, the following tests were conducted: hydrostatic test, instant rupture, shorttime failure pressure, Gardner impact, transverse stiffness and axial tension. Field tests were conducted in Mossor? RN (BRAZIL), where 1,677 meters of piping were used. The tests results of the three types of pipes were compared in two events: after two months from manufacturing of the samples and after nine months of field application. The results indicate that the glass/epoxy pipes with an intermediate layer of fiber glass composite, polyester e sand and with an external layer of high density polyurethane showed superior properties as compared to the other two and met the requirements of pressure class, axial tensile strength, transverse stiffness, impact and environmental conditions, for onshore applications as production lines / As tubula??es para transporte de petr?leo dos po?os de produ??o at? a esta??o coletora s?o denominadas de linhas de surg?ncia . Essas tubula??es est?o sujeitas ? corros?o qu?mica e eletroqu?mica, de acordo com o ambiente e os tipos de petr?leo. Algumas dessas linhas, a depender da composi??o do petr?leo produzido falham, ?s vezes, com menos de um ano de opera??o, devido ? corros?o interna severa. Este trabalho objetiva o desenvolvimento de tubula??o em comp?sito revestida externamente com poliuretano de alta densidade, para aplica??o em linhas de surg?ncia de po?os de petr?leo onshore e que atenda ?s exig?ncias operacionais. Neste desenvolvimento foram empregados fibra de vidro, resina ep?xi, resina poli?ster, areia quartzosa e poliuretano (PU) de alta densidade. Os tubos foram produzidos pelos processos de enrolamento filamentar com deposi??o de PU na superf?cie externa e extremidades com rosca moldada (API 15 HR e PM-VII). Foram produzidas tr?s concep??es de tubos: vidro/ep?xi sem revestimento, vidro/ep?xi revestido com poliuretano de alta densidade e vidro/ep?xi coberto por um composto de fibra de vidro, poli?ster e areia, revestido externamente com poliuretano de alta densidade. Amostras das tr?s concep??es foram caracterizadas atrav?s da t?cnica de Microscopia Eletr?nica de Varredura (MEV), da determina??o do teor de vidro e resina, dos ensaios de rigidez e tra??o axial e dos testes hidrost?ticos, ruptura instant?nea, press?o de curta dura??o e impacto Gardner. Essa nova tecnologia foi testada no campo de produ??o em Mossor? RN, nos quais foram instalados 1.677 metros de tubos. Assim, os resultados dos ensaios e testes das tr?s concep??es de tubos foram comparados entre si em dois eventos: ap?s dois meses da fabrica??o das amostras e ap?s nove meses da aplica??o dos tubos em campo. Os dados indicaram que o tubo em comp?sito vidro/ep?xi, poli?ster e areia, revestido externamente com poliuretano de alta densidade , apresentou melhores resultados quando comparado aos outros dois, podendo ser usado na ind?stria de petr?leo em aplica??es onshore , como uma alternativa para a aplica??o em linhas de surg?ncia, atendendo ?s exig?ncias de classe de press?o, resist?ncia ? tra??o axial, rigidez, impacto e intemp?ries