Behaviour of composite sandwich beams with different shear span-to-depth ratios

Ferdous, Wahid and Manalo, Allan and Aravinthan, Thiru (2017) Behaviour of composite sandwich beams with different shear span-to-depth ratios. In: 24th Australasian Conference on the Mechanics of Structures and Materials: Advancements and Challenges (ACMSM24), 6-9 Dec 2016, Perth, Australia.

Abstract

A novel composite sandwich beam made up of glass fibre reinforced polymer (GFRP) skins and phenolic core material has been developed for use in civil infrastructure applications. To understand the shear and flexural behaviour of the sandwich systems, static bending test was conducted using beams in different orientations and with varying shear span-to-depth (a/D) ratios. The beams were cut into 20 mm × 40 mm cross section and tested in both flatwise (GFRP skin in horizontal plane) and edgewise (GFRP skin in vertical plane) orientation with a/D ratios of 2, 4 and 6. The results showed that the a/D ratio has a significant influence on the develop-ment of bending and shear stresses affecting the mode of failure. In flatwise position, the observed failure modes were (a) core shear (a/D = 2), (b) core shear followed by de-bonding between core and skin (a/D = 4), and (c) skin compression followed by de-bonding between core and skin (a/D = 6). In edgewise orientation, the failure was governed by (a) skin shear (a/D = 2), and (b) core tension followed by skin shear and skin compression (a/D at 4), and (c) core tension followed by skin compression and buckling. The beams at edge-wise orientation can provide 1.94 times higher bending stiffness and better ductile properties than the flatwise orientation with the same beam dimensions. The increase of shear span-to-depth ratio from 2 to 6 decrease the load carrying capacity of the beam and gradually changes the beam behaviour from shear to flexural dominance.


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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, in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 12 Oct 2017 04:43
Last Modified: 12 Oct 2017 04:43
Uncontrolled Keywords: composite sandwich beams
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
Identification Number or DOI: 10.1201/9781315226460-34
URI: http://eprints.usq.edu.au/id/eprint/30774

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