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Influence of shear on the permeability tensor and compaction behaviour of a non-crimp fabric

Identifieur interne : 000068 ( Main/Exploration ); précédent : 000067; suivant : 000069

Influence of shear on the permeability tensor and compaction behaviour of a non-crimp fabric

Auteurs : S. Aranda [Allemagne] ; D. C. Berg [Allemagne] ; M. Dickert [Allemagne] ; M. Drechsel [Allemagne] ; G. Ziegmann [Allemagne]

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Mots-clés :

Abstract

This work presents the results of a study on the permeability and compaction behaviour of textiles under shear deformation. In this study a 0°/90° non-crimp carbon fibre fabric with an areal weight of 200 g/m2 is used. The influence of shear is observed under two conditions: constant cavity height and constant fibre volume fraction (Vf). Permeability measurements were conducted as one-dimensional as well as two-dimensional flow experiments, totalling 119 experiments. Additional compaction tests of the sheared textiles (13 experiments) lead to a more thorough understanding of the mechanisms at work. It is shown that for constant cavity heights the behaviour of the textile greatly changes between a shear angle of 15° and 20°. Up to an angle of 15° the permeability shows a linear increase for the principal axis and a linear decrease for the secondary axis. At shear angles above 20° the behaviour for both is non-linear. Furthermore this change of behaviour can also be observed in the rotation of the flow ellipse and the compaction measurements. Both show a double-linear development with a change of behaviour in the region of 15-20°.


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<div type="abstract" xml:lang="en">This work presents the results of a study on the permeability and compaction behaviour of textiles under shear deformation. In this study a 0°/90° non-crimp carbon fibre fabric with an areal weight of 200 g/m
<sup>2</sup>
is used. The influence of shear is observed under two conditions: constant cavity height and constant fibre volume fraction (V
<sub>f</sub>
). Permeability measurements were conducted as one-dimensional as well as two-dimensional flow experiments, totalling 119 experiments. Additional compaction tests of the sheared textiles (13 experiments) lead to a more thorough understanding of the mechanisms at work. It is shown that for constant cavity heights the behaviour of the textile greatly changes between a shear angle of 15° and 20°. Up to an angle of 15°
<sup> </sup>
the permeability shows a linear increase for the principal axis and a linear decrease for the secondary axis. At shear angles above 20° the behaviour for both is non-linear. Furthermore this change of behaviour can also be observed in the rotation of the flow ellipse and the compaction measurements. Both show a double-linear development with a change of behaviour in the region of 15-20°.</div>
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