Effect of yarn cross-sectional shape on resin flow through inter-yarn gaps in textile reinforcements

Endruweit, Andreas and Zeng, X. and Matveev, Mikhail Y. and Long, Andrew C. (2018) Effect of yarn cross-sectional shape on resin flow through inter-yarn gaps in textile reinforcements. Composites Part A: Applied Science and Manufacturing, 104 . pp. 139-150. ISSN 1359-835X

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Abstract

Axial flow through gaps between aligned straight yarns with realistic cross-sectional shapes, described by power-ellipses, was analysed numerically. At a given fibre volume fraction, equivalent gap permeabilities have a maximum at minimum size of elongated tapering parts of the gap cross-section and a ratio of gap width to height near 1. When the yarn spacing is given in addition to the fibre volume fraction, calculated maximum and minimum values for the equivalent permeability of inter-yarn gaps, which occur at near-rectangular and lenticular cross-sections, differ by factors of up to 3.3. Novel approximations for the shape factor and the hydraulic diameter in Poiseuille flow were derived as a function of the fibre volume fraction, the yarn cross-sectional aspect ratio and the exponent describing the shape of the power-elliptical yarn cross-section. This allows the equivalent gap permeability to be predicted with good accuracy for any fibre volume fraction and yarn cross-section.

Item Type: Article
Keywords: Fabrics/textiles; Permeability; Numerical analysis; Resin flow
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: 10.1016/j.compositesa.2017.10.020
Depositing User: Eprints, Support
Date Deposited: 02 Nov 2017 09:22
Last Modified: 07 Nov 2017 22:55
URI: http://eprints.nottingham.ac.uk/id/eprint/47777

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