Análise de critérios de falhas em lâminas reforçadas com tecidos unidirecionais de fibra de curauá
This study aims to analyze the mechanical properties and the mechanical behavior of two laminas reinforced with unidirectional fabric curauá with different fiber volume fractions, based on failure criteria defined in the literature. The composites which have polymeric matrix and reinforcement with u...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/20565 |
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| Resumo: | This study aims to analyze the mechanical properties and the mechanical behavior of two laminas reinforced with unidirectional fabric curauá with different fiber volume fractions, based on failure criteria defined in the literature. The composites which have polymeric matrix and reinforcement with unidirectional fabric curaua fiber, were submitted to tensile and shear tests at a series of specimens standardized whose fiber orientation directed at angles of 0⁰, 10⁰, 20⁰, 75⁰ and 90⁰ to the lamina with volume fraction of 30% and 0⁰, 30 °, 45 °, 60 °, and 90 ° to the lamina with volume fraction of 22% to tensile tests and shear tests the direction of strengthening the angle was 90 ° to the x axis (direction of the applied load). The tests were performed in a universal machine traction and collected the data of mechanical properties of the composite specimens. These experimental data were entered in the theoretical equations that define the failure criteria, as well as graphically treated to analyze the results and compare the enhanced orientation angles. It found major disparities between the experimental data of elastic modulus and Poisson's ratio in relation to the theoretical behavior primarily to the lamina with a lower volume fraction. The composite reinforcement orientation at 0 ° showed the highest tensile strength compared to other inclinations for the two laminas. However, regarding the failure criteria laminas have different behaviors. To the lamina with volume fraction 30%, the four criteria studied in this thesis showed equivalent results in terms of resistance and to the blade with volume fraction of 22%, only the maximum stress criterion was not satisfactory in representing experiemtais data. |
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