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Advisor(s)
Abstract(s)
Nos últimos anos temos assistido a um aumento significativo da utilização de
compósitos sanduíche nos mais variados campos da engenharia e este fenómeno tende a
continuar. Contudo, a resistência residual destes materiais é fortemente afetada pelos
defeitos que decorrem durante o processo de fabrico e/ou de cargas de impacto que surgem
ao longo da sua vida em serviço. O presente trabalho estuda o comportamento de laminados e compósitos sanduíche, com lâminas de GFRP e núcleos de cortiça, quando submetidos a
múltiplos impactos de baixa velocidade. Verifica-que a resistência ao impacto é maior para os painéis sanduíche do que para os laminados, contudo, este efeito é mais significativo à medida que a energia de impacto diminui.
In recent years, there has been a rapid growth in the use of composites sandwich in engineering applications and this phenomenon will be continuing. However, the residual strength of those materials is largely affected by the damages occurred along the manufacturing process and/or by impact loads that occur during the operational life. This work intends to compare the effect of multi low velocity impacts on composites sandwich, made by fibre glass/epoxy skins and cork core, relatively to the glass fibre/epoxy laminates. It is possible to conclude that the impact strength is higher for composites sandwich, however, this tendency increases when the impact energy decreases.
In recent years, there has been a rapid growth in the use of composites sandwich in engineering applications and this phenomenon will be continuing. However, the residual strength of those materials is largely affected by the damages occurred along the manufacturing process and/or by impact loads that occur during the operational life. This work intends to compare the effect of multi low velocity impacts on composites sandwich, made by fibre glass/epoxy skins and cork core, relatively to the glass fibre/epoxy laminates. It is possible to conclude that the impact strength is higher for composites sandwich, however, this tendency increases when the impact energy decreases.
Description
Keywords
Materiais compositos Laminados sanduíche