Dynamic behaviour of debonded GFRP composite beams

Jayatilake, Indunil and Karunasena, Warna and Lokuge, Weena (2013) Dynamic behaviour of debonded GFRP composite beams. Journal of Multifunctional Composites, 1 (2). pp. 113-122. ISSN 2168-4246

Abstract

A new generation composite sandwich made up of glass fibre reinforced polymer (GFRP) skins and high strength phenolic core material has been developed in Australia. Sandwich structure relies on the adhesive bond between the face-sheet and core for its overall stability and consistency. Although perfect bond between the skin and the core is a common assumption, an important issue that needs to be considered in using a composite beam or slab is the development of debonding between the skin and the core, which is a predominant failure mode of these sandwiches. Debonding can happen during fabrication or under service conditions that leads to changes in free vibration behaviour which in turn can result in resonance. Therefore, it is important to make accurate predictions of changes in natural frequencies in such structural elements. This paper investigates the influence of debonding on dynamic behaviour of sandwich beams of different debonding sizes and end conditions. Numerical model is developed with Strand7 finite element software, and the developed model is used for 3D finite element simulation. Free vibration behaviour reported in the literature for composite beams will first be used to compare the analytical results with the fully bonded and debonded beams. Study is extended to depict the effect of debonding on free vibration behaviour of novel composite beams. It is observed that the decrease in natural frequency with the increase in the extent of debonding is more dependent on the width of debonding across the beam than the length along the beam. The end conditions of the beam are also a governing factor dictating which modes are more affected. It is also perceived that full width debonding leads to increased participation of twisting modes in comparison to half-width debonding in clamped-clamped end condition.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published Version restricted in accordance with apparent policy of publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 15 Feb 2014 03:06
Last Modified: 18 Dec 2017 06:59
Uncontrolled Keywords: dynamic behaviour, fibre composites, debonding, natural frequency, vibration modes
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi:10.12783/issn. 2168-4286/1.2/Jayatilake
URI: http://eprints.usq.edu.au/id/eprint/24763

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