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Previous issue date: 2013-01-14 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The composites manufactured with long fibres aligned in a single direction, and overlay has been shown to have better performance than the short fibers randomly distributed. In particular, the lignocellulosic fibers extracted from the sisal leaves, used in conjunction with the epoxy resin has attracted the attention of many researchers because the final properties of the system formed. In this work composites based on epoxy resin reinforced with sisal fibers were manufactured. The sisal fibres were treated with an alkaline solution of 0.06 mol/l NaOH. The treated, and untreated fibres were subjected to tension x extension tests. The composites were manufactured in the "Lossy" mold with the specifications of the samples to be produced (300x20x4 mm). The tension tests were carried out in accordance with the ASTM standards 3039 (for the composite aligned in a single direction) and ASTM D5573 (for composites in overlay), three point bending tests were performed according to ASTM D790. Analyzing the results of the tests of tension and three point bending tests, it was observed that the composites with the configuration of overlapping had the better elastic module in both tests. As to the maximum resistance to tension, the best result was the composites aligned in a single direction. Tests of absorption of water and micrographs are in progress / Os comp?sitos fabricados com fibras longas alinhadas unidirecionalmente e em sobreposi??o tem demonstrado que possuem melhor desempenho do que as fibras cortadas aleatoriamente distribu?das. Em especial, as fibras lignocelul?sicas extra?das do sisal, utilizadas em conjunto com a resina ep?xi tem atra?do a aten??o de muitos pesquisadores devido ?s propriedades finais do sistema formado. No presente trabalho foram fabricados comp?sitos ? base de resina ep?xi refor?ado com fibras de sisal. As fibras de sisal foram submetidas ao tratamento alcalino com NaOH a 0,06 mol/l, em seguida submetidas ao ensaio de tra??o na fibra tratada e n?o tratada. Os comp?sitos foram fabricados no molde denominado de Lossy (molde com perdas) usinado de acordo com as especifica??es das amostras a serem produzidas (300x20x4 mm). Os ensaios de tra??o foram realizados de acordo com as normas ASTM 3039 (Para os comp?sitos alinhados unidirecionalmente) e ASTM D5573 (Para os comp?sitos em sobreposi??o), os ensaios de flex?o em tr?s pontos foram realizados de acordo com as normas ASTM D 790. Analisando os resultados dos ensaios de tra??o e flex?o em tr?s pontos, foram observados que os comp?sitos com a configura??o de sobreposi??o teve melhor m?dulo de elasticidade em ambos os ensaios. Quanto a resist?ncia m?xima a tra??o o melhor resultado foi do comp?sito alinhado unidirecionalmente. No ensaio de absor??o de ?gua foi observado que os comp?sitos possuem um n?vel muito baixo de absor??o e o comp?sito alinhado unidirecionalmente obteve percentual de satura??o de 1,97 %. Nas micrografias, se observa as regi?es de ruptura/trincas do comp?sito e seu comportamento (fibra/matriz)
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15708 |
| Date | 14 January 2013 |
| Creators | Holanda, Elis?ngela Bezerra das Neves |
| Contributors | CPF:18222161415, http://lattes.cnpq.br/8553209522282182, Felipe, Maria Gorete, CPF:19989490449, http://lattes.cnpq.br/3151683042790067, Nascimento, Jos? Heriberto Oliveira do, CPF:02452573493, http://lattes.cnpq.br/7033735079037677, Souza, Roberto Silva de, CPF:44466927472, http://lattes.cnpq.br/4012782800846844, Ladchumananandasivam, Rasiah |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Mec?nica, UFRN, BR, Tecnologia de Materiais; Projetos Mec?nicos; Termoci?ncias |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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