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Previous issue date: 2017-08-31 / As quest?es ambientais v?m provocando discuss?es entre v?rios atores sociais
compostos por grupos de ativistas, ambientalistas, pol?ticos, cientistas, pesquisadores,
discentes, institui??es p?blicas e privadas. Dentro deste universo o presente trabalho prop?ese
a obter e caracterizar um comp?sito de matriz de resina Poli?ster Ortoft?lica com carga de
refor?o/ enchimento de fibra vegetal da esp?cie Agave Angustifolia Haw na propor??o de 5%,
7,5% e 10% em massa em rela??o ? matriz. Foram fabricadas mantas de fibra da agave para
tr?s formula??es e, para a obten??o do comp?sito, utilizou-se o processo de prensagem a frio.
As mantas de agave, intercaladas com a resina, foram colocadas no molde com orienta??es
defasadas de 90? entre as mesmas e pesando 5g cada. Os corpos de prova das formula??es dos
comp?sitos foram fabricados em molde fechado, baseados em normas espec?ficas e foram
submetidos a ciclos de ensaios mec?nicos, t?rmicos, f?sicos e qu?micos. Sendo determinadas
as resist?ncias mec?nicas a tra??o, flex?o, impacto, propriedades termof?sicas, a densidade, a
absor??o de ?gua doce e salgada, e a composi??o qu?mica atrav?s da Espectrometria de
Fluoresc?ncia de Raios X (FRX). Provou-se a viabilidade de obten??o do comp?sito para
todas as formula??es estudadas. A formula??o mecanicamente mais vi?vel foi a de 10% de
fibra de Agave Angustifolia Haw. Todas as formula??es apresentaram resist?ncias mec?nicas
? tra??o e ao impacto superiores ? da resina matriz, traduzindo uma fun??o de carga de refor?o
da fibra de Agave utilizada. As fibras comportaram-se como carga de enchimento quando
todas as suas formula??es apresentaram resist?ncias mec?nicas a flex?o inferior ? da resina
matriz. / Environmental issues have raised discussions among several social agents such as
activists, ambietalists, politicians, scientists, professors and both private and public
institutions. Within this scope, this paper aims to develop and carachterize an Orthophthalic
Polyester resin matrix composite with reinforcing / filling load of vegetable fiber of the
species Agave Angustifolia Haw in the proportion of 5%, 7.5% and 10% in mass comparing
to the matrix. Agave fiber blankets were made for three formulations and, to obtain the
composite, the cold pressing process was used. The agave blankets, intercalated with the resin,
were placed in the template with 90? lagged orientations between them and weighing 5g each.
The test specimens of the composite formulations were fabricated in a closed mould, based on
specific standards and subjected to mechanical, thermal, physical and chemical test cycles.
The tensile strength, flexural strength, impact, thermophysical properties, density, freshwater
and saltwater absorption, and chemical composition are determined by X-Ray Fluorescence
Spectrometry (FRX). The feasibility of obtaining the composite was tested for all formulations
studied. The mechanically most viable formulation was the one composed by 10% Agave
Angustifolia Haw fiber. All the formulations had higher tensile and impact strength than the
matrix resin, leading to a reinforcing load function of the Agave fiber used. The fibers
behaved as fillers when all of their formulations presented mechanical strength at lower
flexion than the matrix resin.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24658 |
| Date | 31 August 2017 |
| Creators | Santos J?nior, Zulmar Jofli dos |
| Contributors | 25094955420, Gomes, Iverton Rodrigo Barbosa, 01185591419, Aquino, Marcos Silva de, 47426632415, Mac?do Neto, Miguel Cabral de, 01103713485, Santos, Natanaeyfle Randemberg Gomes dos, 03047568499, Souza, Luiz Guilherme Meira de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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