Prediction of the flexural behavior of fibre composite sandwich beams

Manalo, Allan C. and Aravinthan, Thiru and Karunasena, Karu (2012) Prediction of the flexural behavior of fibre composite sandwich beams. In: 3rd Asia-Pacific Conference on FRP in Structures (APFIS 2012), 2-4 Feb 2012, Sapporo, Japan.


One of the core assumptions underlying the construction industry is that the true potential of fibre composite sandwich structures can only be exploited through the use of complex mathematical theories and sophisticated analysis techniques. Research experience at the Centre of Excellence in Engineered Fibre Composites at the University of Southern Queensland has shown that with correct material data, the behaviour of composite sandwich structures can be analysed within acceptable levels of confidence using simple techniques. In this paper, a simplified Fibre Model Analysis (FMA) to describe the approximate behavior and the governing failure mechanisms of composite sandwich structures under flexural load is presented. This fundamental design methodology is based on sectional equilibrium, strain compatibility, and the constitutive material behaviour using a layer-by-layer approach to evaluate the sectional forces and to calculate the nominal flexural capacity of a composite sandwich section. An important advantage of the proposed model is that it can account for the nonlinear behaviour of the core in compression, the effect of core cracking in tension and the linear elastic behaviour of the fibre composite skins. This method also allows analysing composite sandwich structures with non-symmetric section and using only MS Excel spreadsheet program. The efficiency and practical application of this prediction equation is demonstrated by analysing the behavior of individual and glue-laminated composite sandwich beam structures made from the glass fibre composite skins and phenolic core material and comparing with the results of experimental investigation and numerical simulation. This method was found to reasonably describe the behavior of the fibre composite sandwich structures in flexure, therefore suggested as very useful for engineering design and calculations.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Authors retain copyright.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Agricultural, Civil and Environmental Engineering
Date Deposited: 27 Apr 2013 01:09
Last Modified: 17 Sep 2014 04:20
Uncontrolled Keywords: sandwich structures; fibre composites; fibre model analysis; design methods; flexure
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090506 Structural Engineering
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering

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