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Abstract(s)
Num material compósito, a escolha de reforço e matriz deve ter em conta a aplicação final, ou
seja, as solicitações mecânicas, térmicas e químicas a que o material vai estar sujeito em
serviço. Assim, este trabalho estuda o efeito da adição de fillers de alótropos de carbono –
nanotubos de carbono - nas propriedades mecânicas de um compósito de matriz poliéster
reforçada com fibras de carbono, em particular na sua resistência à tração. Foram preparadas 3
matrizes, onde uma consistia apenas em resina poliéster ATLAC 580, e nas duas restantes à
resina foi adicionada 0.5% e 1% de nanotubos de carbono respetivamente. Pretende-se ficar a
conhecer o efeito que pormenores de construção, como furações, têm sobre o comportamento
de materiais compósitos, com e sem partículas de reforço. A adição de nanotubos de carbono
apresenta melhorias notórias no módulo de elasticidade nomeadamente para provetes com furo.
Para provetes onde não há furação, quanto maior for a quantidade de nanotubos de carbono
existentes de matriz menor é o módulo de elasticidade e maior é o número de aglomerados.
In a composite material, the choice of reinforcement and matrix should take into account the final application, i.e., the mechanical, thermal and chemical demands to which the material will be subjected in service. Thus, this work studies the effect of adding carbon allotrope fillers - carbon nanotubes - on the mechanical properties of a polyester matrix composite reinforced with carbon fibers, in particular on its tensile strength. Three matrices were prepared, where one consisted only of polyester resin ATLAC 580, and in the other two, 0.5% and 1% of carbon nanotubes respectively were added to the resin. The aim is to find out the effect that construction details, such as perforations, have on the behavior of composite materials, with and without reinforcement particles. The addition of carbon nanotubes shows remarkable improvements in the modulus of elasticity, especially for specimens with holes. For specimens without holes, the greater the amount of carbon nanotubes in the matrix, the lower the modulus of elasticity and the greater the number of clusters.
In a composite material, the choice of reinforcement and matrix should take into account the final application, i.e., the mechanical, thermal and chemical demands to which the material will be subjected in service. Thus, this work studies the effect of adding carbon allotrope fillers - carbon nanotubes - on the mechanical properties of a polyester matrix composite reinforced with carbon fibers, in particular on its tensile strength. Three matrices were prepared, where one consisted only of polyester resin ATLAC 580, and in the other two, 0.5% and 1% of carbon nanotubes respectively were added to the resin. The aim is to find out the effect that construction details, such as perforations, have on the behavior of composite materials, with and without reinforcement particles. The addition of carbon nanotubes shows remarkable improvements in the modulus of elasticity, especially for specimens with holes. For specimens without holes, the greater the amount of carbon nanotubes in the matrix, the lower the modulus of elasticity and the greater the number of clusters.
Description
Keywords
Fibras de Carbono Resina Poliéster Reforçada com Fibras de Carbono Nanotubos de Carbono Propriedades Mecânicas Ensaios de Tração Carbon fibers Carbon Fiber Polyester Resin Carbon Nanotubes Mechanical properties Tensile Tests