Estudo do dano em compósitos com descontinuidades geométricas
Recently, due to the growth of applications with laminated composite materials, there has been a great increase in the search for methods that can predict the behavior of such materials with different geometries submitted to different efforts. A direct consequence of these geom...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/43043 |
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| Resumo: | Recently, due to the growth of applications with laminated composite materials, there has
been a great increase in the search for methods that can predict the behavior of such
materials with different geometries submitted to different efforts. A direct consequence of
these geometric discontinuities is the appearance of cracks in the material, making it
necessary to study the damage to enable the use of the composite material in these
applications. In this work, it was proposed the study of the influence of stress concentration
and delamination in these materials, and to perform such analysis, were selected composite
materials with different lay-ups simulating different mechanical tests and validating the
results according to the literature. The tests were simulated using the finite element method
(FEM), using commercial software MARC ™, to obtain the distribution of the stress field in
the region of the geometric discontinuity. Firstly, tensile testing were performed on carbon
fiber and Epoxy resin composites. The simulated geometries for this material were a central
hole, double stress concentration and triple stress concentration. Another simulated test was
the four-point bending in a honeycomb core-like fiberglass sandwich composite, the
geometry tested for this material was also the plate with central hole. After the simulations
of stress fields for these materials and geometries, it was studied the insertion of
delamination elements in the transversal hole section to analyze the damage and
propagation of cracks in the composite materials. The results found for the executed cases
were compatible with the experimental data present in the specialized literature,
demonstrating the potential of the study of stress concentration factors in composite
materials through the MEF. |
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