The shear viscosity of carbon fibre suspension and its application for fibre length measurement

Jiang, Guozhan and Turner, Thomas A. and Pickering, Stephen J. (2016) The shear viscosity of carbon fibre suspension and its application for fibre length measurement. Rheologica Acta, 55 (1). pp. 1-10. ISSN 0035-4511

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The viscosity of short carbon fibre suspensions in glycerol aqueous solution was measured using a bespoke vane-in-cup viscometer, where the carbon fibre has an aspect ratio from 450 to 2209. In the semi-concentrated regime, nL3 ranging from 20 to 4400, the suspensions demonstrated strong shear-thinning characteristics particularly at higher concentrations. The shear-thinning characteristic is strongly related to the crowding factor proposed by Kerekes, indicating that non-hydrodynamic interactions occur in the suspensions. The influence of fibre bending on viscosity emerges when the bending ratio is lower than 0.0028. An empirical model based on transient network formation and rupture was proposed and used to correlate the relative viscosity with fibre concentration nL3 and shear rate. Based on the model, a viscosity method is established to analyse the fibre length by measuring the viscosity of the fibre suspension using a bespoke vane-in-cup viscometer.

Item Type: Article
Additional Information: The final publication is available at Springer via
Keywords: Carbon fibre, suspension, viscosity, vane-in-cup, shear-thinning
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
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Depositing User: Eprints, Support
Date Deposited: 08 Sep 2017 12:17
Last Modified: 04 May 2020 17:33

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