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Publications
Castilho, T., Sutherland, L.S. and Guedes Soares, C. (2015), “Impact resistance of marine sandwich composites”, Maritime Technology and Engineering, Guedes Soares, C. & Santos T.A. (Eds.), Taylor & Francis Group, London, UK, pp. 607-618
This work is motivated by the ever increasing range of applications of sandwich composite materials in the marine industry. A brief literature review is presented, followed by the manufacture and flexure, quasi-static and impact tests of a series of marine sandwich composites. Different core materials (PVC, Balsa Corecork NL10 and NL20) are used to produce a sandwich laminate, with E-glass/polyester skins. Drop-weight tests are performed until the failure of the second skin. PVC and NL20 specimens show predictability and repeatability of results, while NL10 present different failure modes and higher absorbed energy. Apart from the peak forces at the failure of both skins, that are around 1.5 times higher in the impact tests, the overall behaviour of the PVC, Balsa and NL20 specimens is well predicted by quasi-static tests. On the other hand, NL10 specimens’ behaviour change dramatically from static do impact test, increasing 3 times the absorbed energy. This work indicates that cork sandwich composites have potential in applications with impact requirements, with the downside of lower stiffness and higher weight.
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