Mechanical performance of carbon fibre-reinforced composites based on stitched preforms |
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| Affiliation: | 1. Polymer Engineering, University of Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany;2. Eurocopter Deutschland GmbH, D-81663 Munich, Germany;1. Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104, USA;2. FAA William J. Hughes Technical Center, Atlantic City International Airport, NJ 08405, USA;1. Department of Metallurgy and Materials Engineering, KU Leuven, Belgium;2. Owens Corning, Composites Solutions Business, Sant Vicenç de Castellet, Spain;3. Owens Corning, Composites Solutions Business, Science & Technology Center, Chambéry, France;1. Department of Mechanical Engineering, Hanyang University, 222 Wasngsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Automotive Materials Lab, LG Hausys, Republic of Korea, 30, Magokjungang 10-ro, Gangseo-gu, Seoul, Republic of Korea;3. Institute of Nano Science and Technology, Hanyang University, 222 Wasngsimni-ro, Seongdong-gu, Seoul 133-791, Republic of Korea;1. Luleå University of Technology, SE-971 87 Luleå, Sweden;2. Swerea SICOMP, Box 104, SE-431 22 Mölndal, Sweden;1. School of Engineering, RMIT University, Melbourne, VIC 3001, Australia;2. School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney, NSW 2052, Australia |
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| Abstract: | A comparative assessment of the influence of pure assembly seams based on a thin (11 tex) polyester yarn in a zigzag geometry on the resulting mechanical performance of a non-crimped fabric (NCF) carbon fibre-reinforced epoxy composite manufactured by vacuum-assisted resin transfer moulding is presented. This study was aimed at generating a solid foundation regarding the overall performance level of stitched NCF composites and at identifying critical property changes. The comprehensive evaluation of the mechanical composite properties includes static as well as dynamic tests of the in-plane properties as well as a characterisation of the interlaminar properties such as apparent interlaminar shear strength (ILSS) and compression after impact (CAI). It is demonstrated that mechanical properties such as the tensile and compression stiffness and CAI strength are not degraded by the chosen stitching parameters, whereas the tensile and compression strength, ILSS as well as the tensile fatigue behaviour are reduced as a result of pronounced localised fibre ondulations. A direct comparison to properties of a commonly used 5H satin woven fabric composite verifies that the overall performance of these particular stitched NCF composites must be enhanced with regard to the identified key criteria to meet the level required for aircraft applications and in order to maintain the performance advantage of NCF composites as compared to standard woven fabrics in general. Promising approaches include the use of different yarn materials based on soluble thermoplastics and/or modified stitching parameters. |
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