Effect of skin-core debonding on the dynamic behaviour of GFRP composite beams

Jayatilake, Indunil and Karunasena, Warna and Lokuge, Weena (2013) Effect of skin-core debonding on the dynamic behaviour of GFRP composite beams. In: 4th International Conference on Smart Materials and Nanotechnology in Engineering (SMN 2013), 10-12 Jul 2013, Gold Coast, Australia.

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Composites are materials made by combining two individual materials where one material forms the matrix while the other provides the reinforcement. A novel composite sandwich made up of glass fibre reinforced polymer (GFRP) face sheets and modified phenolic core has been developed recently. 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 is the development of debonding between the skin and the core. Debonding may arise during fabrication or under service conditions, which causes changes to the dynamic behaviour in addition to the strength degradation. This paper focuses on the effect of debonding on dynamic characteristics of sandwich beams of different debonding sizes and end conditions. Strand7 software 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 revealed 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. 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. End conditions of the beam are a governing factor dictating which modes are more affected.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: © (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Print copy of the Proceedings held in the USQ Library at call no. 620.5 Fou.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 28 Jan 2014 01:33
Last Modified: 15 May 2017 05:12
Uncontrolled Keywords: composites; debonding; dynamic behaviour; natural frequency; vibration modes
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0913 Mechanical Engineering > 091304 Dynamics, Vibration and Vibration Control
09 Engineering > 0913 Mechanical Engineering > 091307 Numerical Modelling and Mechanical Characterisation
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870399 Construction Materials Performance and Processes not elsewhere classified
Identification Number or DOI: 10.1117/12.2026751
URI: http://eprints.usq.edu.au/id/eprint/24117

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