Diffusion studies on advanced fibre hybrid composites

Gopalan, R and Murthy, MVV (1985) Diffusion studies on advanced fibre hybrid composites. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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Abstract

The moisture diffusion characteristics of simple (E-glass, Graphite and Kevlar) and hybrid (E-Glass-Graphite, Graphite-Kevlar and Kevlar-E-Glass) unidirectional composites have been studied at 296 K and 343 K under water immersion conditions. The equilibrium moisture13; content (Mm) and diffusion coefficient (Dx) of Kevlar fiber composite are respectively as high as 5 and 10 times that of E-glass/Graphite fiber composites. It is shown that it is possible to evaluate the diffusion characteristics Mm and Dx of hybrid composites from the corresponding values of their simple composites. The experimental data for simple and hybrid composites comprising both impermeable and/or permeable fiber composites show good correlations with the analytical Fickian Diffusion plot. The effect of edge coating on the moisture absorption is quite significant in the permeable fiber composites.(E.A.K.)

Item Type: Proj.Doc/Technical Report (Technical Report)
Uncontrolled Keywords: Diffusion coefficient;Fiber composites;Kevlar (Trademark); Moisture content;Superhybrid materials;E glass;Ficks equation;Graphite;Mechanical properties; Permeability; Reinforcing fibers
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
Division/Department: Advanced Composites Division, Structures Division
Depositing User: M/S ICAST NAL
Date Deposited: 15 Apr 2008
Last Modified: 24 May 2010 09:55
URI: http://nal-ir.nal.res.in/id/eprint/4281

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