Mendes, José Ubiragi de LimaSouza, Luiz Guilherme Vieira Meira de2019-07-232019-07-232018-11-29SOUZA, Luiz Guilherme Vieira Meira de. Efeitos da adição de tecido de fibra de vidro tipo E a um compósito de resina poliéster e tecido de fibra de algodão. 2018. 130f. Tese (Doutorado em Engenharia Mecânica) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2018.https://repositorio.ufrn.br/jspui/handle/123456789/27366In recent years, the need for new applications, as well as factors related to environmental degradation and the use of non-renewable energy sources, has brought the demand for sustainable materials that meet specific properties such as: low weight, competitive cost and mechanical resistance compatible with each application. This has driven the development and use of composite materials composed of polymer matrices and natural fiber fillers. However, it is worth mentioning that the use of these materials occurs mainly in non-structural applications, since natural fibers generally play the role of filler. To counterbalance this disadvantage, one aspect that is being sought is the hybridization of the load of these composite materials, mixing natural fibers with synthetic fibers such as glass fiber. Taking this into account, this research consisted of evaluating the effect of hybridization in a composite material with a polyester resin matrix and load of cotton fiber fabric and E-glass fiber fabric. Three configurations were selected for the proposed composite material: 4TFA+5TFVE, 5TFA+6TFVE and 6TFA+7TFVE, which had 4, 5 and 6 layers of cotton fiber fabric and 5, 6 and 7 layers of fiberglass fabric, respectively. A characterization study was carried out in each of these configurations to evaluate density, tensile, flexural and impact strength, hardness, thermal conductivity and diffusivity, specific volumetric heat, thermal stability and resistance to natural aging and to water absorption. In addition, the specimens that were submitted to the tensile test were analyzed by scanning electron microscopy, to enable an identification of the fault mechanisms and possible defects present in the composites. The results were compared with those of a non-hybrid composite material of the same matrix, but with cotton fiber fabric load only, developed in a research found in the literature. The technical feasibility of the proposed material as an engineering material was demonstrated, since all the configurations studied presented density similar to that of the matrix and provided increases in the mechanical properties of the resin. This provides lightness and represents a broad applicability potential, such as the wind turbine that was fabricated in this study to attest the processability of the material. Among the studied configurations, the one that stood out the most was the 6TFA + 7TFVE, because it provided greater mechanical resistance to the matrix, mainly the impact resistance, which was increased more than five times. The hybrid composite presented higher mechanical strength than the non-hybrid composite, which demonstrated the efficiency of the hybridization process to overcome the mechanical deficiency of the natural fibers.Acesso AbertoHibridizaçãoMaterial compósitoTecido de fibra de algodãoTecido de fibra de vidro tipo EEstudo de caracterizaçãodoctoralThesisCNPQ::ENGENHARIAS::ENGENHARIA MECANICA