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Abstract(s)
A pultrusão é uma técnica já sobejamente conhecida de produção de perfis de
secção constante, tais como barras, cantoneiras, perfis estruturais ou tubos, em
materiais compósitos de matriz polimérica.
A necessidade de, em determinadas aplicações, utilizar perfis que proporcionem
melhor isolamento térmico, melhor isolamento acústico ou possuam um momento
de inércia ligeiramente superior, sem que o peso próprio seja significativamente
afectado, levou à produção de perfis pultrudidos híbridos, com núcleos baseados em
pré-formas ou na alimentação contínua de resíduos.
Realizados os protótipos seguindo as metodologias acima descritas, urge verificar se
as propriedades dos perfis híbridos correspondem às expectativas inicialmente neles
depositadas, através de testes destrutivos e não-destrutivos.
Assim, foram realizados testes à tracção, à compressão e à flexão, no intuito de
verificar os ganhos conseguidos e poder analisar o valor-acrescentado trazido por
estes novos perfis em termos estruturais. Estes valores, depois de devidamente
validados, permitirão a sua inserção em bases de dados agregadas a programas de
cálculo estrutural, que efectuam de forma automática o dimensionamento de
estruturas baseadas em perfis desta natureza. Complementarmente, foram
realizados testes de isolamento térmico e acústico, com vista a quantificar a
melhoria conseguida nestas propriedades, extremamente importantes em
determinados tipos de aplicações ligadas à construção civil e obras públicas.
Pultrusion is a technique already widely known for production of constant cross-section profiles, such as bars, L-shape, T-shape or structural tubes and profiles in polymer matrix composite materials. In some applications, requirements demanding for profiles that provide better thermal or sound insulation or need a slightly higher moment of inertia without increasing the self-weight, leading to the production of hybrid pultruded profiles, with nuclei based on preforms or continuous feed waste. After obtained the prototypes according to the methodologies described above, it’s time to verify if the properties of these hybrid profiles correspond to initial expectations, carrying out non-destructive and destructive tests. Thus, tensile, compression and bending tests were performed, in order to verify the gains achieved and to analyze the added value brought by these new profiles in structural terms. These values, once properly validated, will allow its inclusion in databases attached to structural calculation programs, performing automatically the dimensioning of structures based on such profiles. In addition, tests of thermal and acoustic insulation were performed, in order to quantify the improvement achieved in these properties, which are extremely important in certain kinds of applications linked to the civil construction and public works.
Pultrusion is a technique already widely known for production of constant cross-section profiles, such as bars, L-shape, T-shape or structural tubes and profiles in polymer matrix composite materials. In some applications, requirements demanding for profiles that provide better thermal or sound insulation or need a slightly higher moment of inertia without increasing the self-weight, leading to the production of hybrid pultruded profiles, with nuclei based on preforms or continuous feed waste. After obtained the prototypes according to the methodologies described above, it’s time to verify if the properties of these hybrid profiles correspond to initial expectations, carrying out non-destructive and destructive tests. Thus, tensile, compression and bending tests were performed, in order to verify the gains achieved and to analyze the added value brought by these new profiles in structural terms. These values, once properly validated, will allow its inclusion in databases attached to structural calculation programs, performing automatically the dimensioning of structures based on such profiles. In addition, tests of thermal and acoustic insulation were performed, in order to quantify the improvement achieved in these properties, which are extremely important in certain kinds of applications linked to the civil construction and public works.
Description
Keywords
Pultrusão Perfis pultrudidos híbridos Perfis de material compósito Caracterização de materiais Ensaios Não-Destrutivos Pultrusion Hybrid pultruded pipes Pipes of composite material Materials characterization Nondestructive testing