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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Obten??o, caracteriza??o e utiliza??o de um comp?sito com matriz de resina poli?ster e carga de fibras de sisal

Martins Neto, Jos? Ant?nio 04 March 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-08-09T22:54:12Z No. of bitstreams: 1 JoseAntonioMartinsNeto_TESE.pdf: 2915653 bytes, checksum: 3e8f8a24fb45e2bdcd86834ce7b0d770 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-08-12T22:54:51Z (GMT) No. of bitstreams: 1 JoseAntonioMartinsNeto_TESE.pdf: 2915653 bytes, checksum: 3e8f8a24fb45e2bdcd86834ce7b0d770 (MD5) / Made available in DSpace on 2016-08-12T22:54:51Z (GMT). No. of bitstreams: 1 JoseAntonioMartinsNeto_TESE.pdf: 2915653 bytes, checksum: 3e8f8a24fb45e2bdcd86834ce7b0d770 (MD5) Previous issue date: 2016-03-04 / A constante e atual busca de alternativas sustent?veis tem levado a demanda de esfor?os dos pesquisadores na investiga??o e obten??o de novos materiais, motivando a escalada do desenvolvimento produtivo ecologicamente correto e apresentando solu??es simples e pr?tica com rentabilidade econ?mica vi?vel. Neste sentido, a utiliza??o de materiais procedentes de fontes renov?veis naturais, vegetais, apresenta grande potencial de aplicabilidade e s?o vistos como material alternativo para um desenvolvimento sustent?vel. A sustentabilidade questionada, dentre outros quesitos, depende da renov?vel multiplica??o da mat?ria-prima. Como material alternativo as fibras vegetais podem ser aplicadas para produ??o de uma gama de materiais comp?sitos amenizando o uso de materiais oriundos de fontes n?o renov?veis Nesta tese foram utilizadas mantas de sisal para obten??o de um comp?sito tendo como matriz uma resina poli?ster ortoft?lica. As mantas foram submetidas a tratamento superficial, em ?gua fervente, por 15 minutos. As mantas de fibras de sisal utilizadas tinham, respectivamente, 5%, 10% e 15% da massa do comp?sito. O comp?sito foi obtido e caracterizado mec?nica e termicamente para as formula??es escolhidas. Foram fabricadas v?rias placas do comp?sito para obten??o dos corpos de provas para os ensaios de caracteriza??o obedecendo ?s normas pertinentes. Os comp?sitos obtidos apresentaram resist?ncia mec?nica de tra??o e flex?o inferiores ? da matriz, sendo vi?vel sua utiliza??o onde s?o requeridas baixas solicita??es de carga. O resultado mais expressivo do comp?sito estudado deu-se para a absor??o de energia de impacto, muito superior a da matriz utilizada. Outras propriedades de destaque foram a absor??o em ?leo e a densidade. Provou-se a viabilidade de obten??o do comp?sito para as tr?s formula??es estudadas C5, C10 e C15, cuja mais vi?vel foi a C10. Para demonstrar a viabilidade de utiliza??o do comp?sito foram fabricados um rel?gio de parede, um banco, uma cadeira e uma prateleira, estruturas de baixas solicita??es mec?nicas. Concluiu-se que as mantas de sisal exerceram a fun??o de carga no comp?sito. / The constant search for sustainable alternatives has earned great effort of researchers in research and obtaining new materials, encouraging the rise of eco-friendly productive development and providing simple and practical solutions to economic profitability. In this sense, the use of materials derived from natural renewable sources, vegetables, has great potential applicability to sustainable development. As alternative materials plant fibers can be applied to production of a range of composite materials easing the use of materials derived from non-renewable this thesis were sisal mats used for achieving a composite matrix having as one orthophthalic polyester resin. The webs were subjected to surface treatment in boiling water for 15 minutes. The webs of sisal fibers used were, respectively, 5%, 10% and 15% of the composite weight. The composite was obtained and characterized mechanically and thermally to the chosen formulations. several plates of the composite to obtain the body of evidence for the characterization tests complying with the relevant rules were made. The obtained composites showed strength tensile and bending lower than the array, so it can be used where are required low load requests. The most significant result of the composite studied given to the impact energy absorption, far superior to the matrix used. Other properties were highlighted in oil absorption, and density. It proved the feasibility of obtaining the composite for the three formulations studied C5, C10 and C15 being the most feasible to C10. To demonstrate the feasibility of using composite were made a wall clock, a bench, a chair and a shelf, low mechanical stress structures. It was concluded that the sisal rugs exercised the load function in the composite.

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