Free vibration behaviour of fibre composite sandwich beams with debonds

Karunasena, W. and Jayatilake, I. and Lokuge, W. (2013) Free vibration behaviour of fibre composite sandwich beams with debonds. In: 4th International Conference on Structural Engineering and Construction Management 2013 (ICSECM 2013), 13-15 Dec 2013, Kandy, Sri Lanka.

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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. Debonding refers to separation of skin from the core material in composite sandwiches. Although much research has been carried out to investigate dynamic behaviour of fully bonded composites, research on this aspect for debonded composites is scarce.
This study concentrates on investigating the dynamic behaviour of fibre composite sandwich beams with debonds. A parametric investigation is carried out to assess the influence of various parameters of concern including length and width of the debond, location of debond, size and support conditions of the beam on the free vibration behaviour, using the finite element package Strand7. In the model developed with Strand7, rigid links and master slave links are used to connect skin and core in bonded and debonded regions respectively. Published results for free vibration behaviour for GFRP panels will first be used to compare the analytical results to validate the developed model. Furthermore a spring model is implemented between the skin and the core of debonded beams to take the probable contact conditions into account.
A general reflection through the parametric investigation is that the extent of natural frequency variation with respect to debonding length increases with the order of the natural frequency. Further it is observed that the change in frequency with change in debonding length is much more significant for the full width debonding when compared to half width debonding. It is also perceived that the extent of variation of natural frequency due to debonding in composite beams depends on the degree of contact anticipated in the debonding region.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published Version available under Creative Commons Licence Attribution: No Derivative Works 3.0. Attribution-NoDerivs CC BY-ND. This license allows for redistribution, commercial and non-commercial, as long as it is passed along unchanged and in whole, with credit to the authors.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 09 Apr 2014 09:01
Last Modified: 23 Oct 2014 01:59
Uncontrolled Keywords: sandwich composite beams, glass fibre-reinforced polymer, dynamic behavior, debonds, finite element modeling
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering

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