Mode I interlaminar fracture toughness properties of advanced textile fibreglass composites |
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| Affiliation: | 1. Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, UK;2. School of Mechanical and Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland;3. Evonik Hanse GmbH, Charlottenburger Strasse 9, 21502 Geestacht, Germany;1. State Key Laboratory for Strength and Vibration of Mechanical Structures, International Center for Applied Mechanics, Department of Engineering Mechanics, Xi''an Jiaotong University, Xi''an, 710049, China;2. John A. Paulson School of Engineering and Applied Science, Kavli Institute for Bionano Science and Technology, Harvard University, Cambridge, MA, 02138, United States |
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| Abstract: | The Mode I interlaminar fracture toughness properties of vinyl ester-based composites reinforced with fibreglass manufactured by the advanced textile technologies of braiding, knitting, stitching and through-the-thickness weaving are assessed in comparison to a variety of traditional composites made from fibreglass such as unidirectional or woven rovings. The interlaminar fracture toughness (GIc) of braided and knitted composites are higher than traditional composites by factors of more than two and four, respectively. Toughening in these textile composites was caused by extensive crack branching as the interlaminar crack was forced to follow a tortuous path through the complex fibre architectures. The GIc values of the composites reinforced in the through-thickness direction by weaving or stitching were higher than traditional composites by factors of nearly two and three, respectively, with the main toughening mechanism being crack bridging by the through-thickness binder yarns/stitches. A review of Mode I interlaminar fracture data collected from papers shows that advanced textile techniques are capable of manufacturing composites with substantially improved delamination resistance. |
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