Efeitos da anisotropia e descontinuidades geométricas em PRFV
Glass Fiber-Reinforced Polymer composites (GFRP) have been increasingly utilized in the various engineering sectors, for instance: lightweight structures, of automotive, nautical and aerospace industries, among many other applications. As these materials are being applied in engineering projects,...
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| Formato: | Dissertação |
| Idioma: | por |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/26547 |
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| Resumo: | Glass Fiber-Reinforced Polymer composites (GFRP) have been increasingly
utilized in the various engineering sectors, for instance: lightweight structures, of
automotive, nautical and aerospace industries, among many other applications. As
these materials are being applied in engineering projects, it becomes essential to
know about its mechanical behavior under the various conditions of loading and
service. A problem occurs when the joining of mechanical parts demands the usage
of rivets, bolts, pins, etc. These elements, by their own nature, demand the presence
of holes, tears and notches, in other words, geometric discontinuities, which create
local stresses that compromise the structural performance. The purpose of this
dissertation is to study the mechanical behavior and fracture characteristics of a
laminated polymer composite consisting of four layers of a balanced bidirectional Eglass fiber fabric as reinforcement, impregnated with a thermoset ortho-terephthalic
polyester resin under a uniaxial tensile loading. In the laminated composite
developed, the influence of geometric discontinuities is studied through the presence
of two different types of circular central milled holes: with and without scarfing.
Comparative studies were made about the property of anisotropy and the mechanical
and residual properties for two different fiber orientations relative to the loading:
0º/90º and ± 45º, as well as a macroscopic analysis of the fracture. Volumetric
density and calcination tests were done in order to characterize the composite. |
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