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Abstract(s)
Actualmente vem-se a assistir a um aumento significativo do uso de materiais
compósitos reforçados com fibras em aplicações de engenharia e existe uma forte indicação
de que este fenómeno tende a continuar. Contudo, a resistência e rigidez destes materiais é
fortemente afectada pelos defeitos que decorrem durante o processo de fabrico e/ou de
cargas de impacto que surgem ao longo da sua vida activa. Neste contexto ocorrem enormes
decréscimos da resistência residual destes materiais. O presente trabalho pretende assim
contribuir para um maior conhecimento e melhoria da resistência ao impacto dos materiais
compósitos. Para tal foi utilizada uma resina epóxi nano-transformada tendo-se concluido que
a adição de nanopartículas promove melhorias significativas nas performances ao impacto.
In recent years, there has been a rapid growth in the use of fibre-reinforced composite materials in engineering applications and there is evident indication that this will be continuing. However, the strength and stiffness of these materials are affected significantly by defects that may result from imperfect manufacturing process or from external loads during the operational life. Drastic reductions of the compressive residual strength have been detected. In this context the present works intends to contribute for a better knowledge and improvement of the impact strength of composite materials. Nanoenhanced epoxy resin was used and it was possible concluded that the addition of nanoparticles promote better impact performances.
In recent years, there has been a rapid growth in the use of fibre-reinforced composite materials in engineering applications and there is evident indication that this will be continuing. However, the strength and stiffness of these materials are affected significantly by defects that may result from imperfect manufacturing process or from external loads during the operational life. Drastic reductions of the compressive residual strength have been detected. In this context the present works intends to contribute for a better knowledge and improvement of the impact strength of composite materials. Nanoenhanced epoxy resin was used and it was possible concluded that the addition of nanoparticles promote better impact performances.
Description
Keywords
Materiais compósitos Compósitos híbridos Nanocompósitos Materiais compósitos - Resistência ao impacto Compósitos híbridos - Técnicas não destrutivas
Citation
Publisher
Universidade da Beira Interior