Dynamic analysis of multilayer GFRP sandwich slabs with interlayer delaminations

Jayatilake, Indunil N. and Karunasena, Warna and Lokuge, Weena (2014) Dynamic analysis of multilayer GFRP sandwich slabs with interlayer delaminations. In: 8th Australasian Congress on Applied Mechanics (ACAM 8), 24–28 Nov 2014, Melbourne, Australia.


A structural composite multilayer slab can be manufactured by gluing two or more composite sandwiches together to form a laminated composite. The dynamic behaviour of these multilayer composite structures is an important technological area to be investigated and understood if these materials are to be used efficiently. Interlayer delamination is one of the major failure modes which endanger the reliability of composite structures. Delamination can grow in size under increasing loads and with time and hence render the laminate structurally useless. In particular, delamination may reduce the natural frequency which in turn may result in resonance. The current research study concentrates on investigating the free vibration behaviour of fibre composite multilayer sandwich slabs with interlayer delaminations. A parametric investigation is carried out to assess the influence of various parameters of concern on the free vibration behaviour, using the finite element package Strand7. Furthermore, selected points in the delaminated region are connected appropriately to simulate bolting as a remedial measure to reduce the effect of delamination. Layers within the two delaminated regions are connected by 'master slave links' to allow for sliding in a horizontal plane between the two adjacent delaminated regions but in contact with each other in the vertical direction. First order shear deformation theory based plate elements in Strand7 are used to model each sandwich layer. It is observed from analyses that delamination causes reduction in natural frequency and generally the variation becomes more significant as the mode number increases. It is also revealed that bolting the delaminated region can significantly reduce the natural frequency variation due to delamination thus improving the dynamic performance.

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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 published version due to publisher copyright policy.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 21 Apr 2015 23:27
Last Modified: 19 Jun 2017 00:18
Uncontrolled Keywords: fibre composite multilayer slab; dynamic analysis; free vibration behaviour; delamination
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
09 Engineering > 0913 Mechanical Engineering > 091304 Dynamics, Vibration and Vibration Control
Socio-Economic Objective: 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/26859

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