Flexural behaviour of composite sandwiches for structural applications

Manalo, Allan and Aravinthan, Thiru and Karunasena, Warna and Islam, Mainul (2009) Flexural behaviour of composite sandwiches for structural applications. In: Proceedings of the 9th International Symposium on Fibre Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-9): Current Challenges and Future Trends, 13-15 Jul 2009, Sydney, Australia.

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Abstract

In this paper, structural composite sandwich was investigated under 3 and 4-point static bending tests in the flatwise and edgewise positions to analyse the contribution of the skins in the load carrying capacity and failure mode under flexure. The skins of the composite sandwich are made up of tri-axis E-glass fibres infused with epoxy resin and the core material of fly ash with low density polystyrene beads. Structural composite sandwich with span lengths of 200, 400 and 800 mm was tested until final failure. Analytical calculation of the load capacity and deflection of the composite sandwich was conducted and compared with the experimental results. Preliminary investigation showed that the percentage contribution of the skins in the flexural capacity of composite sandwich tested in the flatwise position is higher than that of the edgewise position. However, the specimen tested in the edgewise position failed at a higher load and exhibited a higher flexural stiffness. The specimens tested in the flatwise position failed due to core shear failure followed by delamination between the skin and the core. On the other hand, the specimens tested in the edgewise position failed in a brittle manner due to the simultaneous shear failure of the skin and the core. The results also showed that the flexural behaviour of the structural sandwich can be predicted analytically using the simple beam theory. For structural composite sandwich, the combined contribution of the skin and the core in carrying the load should considered to efficiently design a composite sandwich structure.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to paper due to publisher's copyright restrictions.
Depositing User: Dr Mainul Islam
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 20 Feb 2010 12:32
Last Modified: 21 Nov 2014 06:19
Uncontrolled Keywords: composite; sandwich; flexure; edgewise; flatwise
Fields of Research (FOR2008): 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective (SEO2008): B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870303 Polymeric Materials (e.g. Paints)
URI: http://eprints.usq.edu.au/id/eprint/6504

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