On-surface fibre-free zones and irregularity of piercing pattern in structurally stitched NCF preforms

Koissin, Vitaly and Ruopp, Andreas and Lomov, Stepan V. and Verpoest, Ignaas and Witzel, Volker and Drechsler, Klaus (2006) On-surface fibre-free zones and irregularity of piercing pattern in structurally stitched NCF preforms. Advanced Composites Letters, 15 (3). pp. 81-88. ISSN 0963-6935

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Abstract:	The paper addresses the surface imperfections (openings in fibrous plies) and irregularity of the piercing pattern in structurally stitched multilayer carbon-fibre preforms. Each layer is a multiaxial multiply non-crimp fabric (NCF) with a non-structural stitching. The term “structural” presumes here that the stitching yarn does not only consolidate the plies (as the non-structural one does) but forms also a through-the-thickness (3D) reinforcement. Four stitching methods are studied: ordinary CNC-sewing, tufting, dual-needle, and curved needle techniques with multifilament yarns: aramide (60 or 120 tex) or glass (204 tex). In total, 14 stitching cases are investigated experimentally. It is observed that a non-negligible variability exists in the meso-level geometry of the reinforcement. The geometrical characterization provides important input data for analysis of the permeability and mechanical properties of the preforms.
Item Type:	Article
Copyright:	© 2006 Woodhead Publishing
Faculty:	Engineering Technology (CTW)
Research Group:	Design, Production and Management (DPM)
Link to this item:	http://purl.utwente.nl/publications/75506
Official URL:	http://www.acletters.org/abstracts/15_3_1.html
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