Internal geometry of woven composite laminates with “fuzzy” carbon nanotube grafted fibers |
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| Affiliation: | 1. School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 47907, USA;2. School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 – bus 2450, B-3001 Leuven, Belgium;2. BAM-Federal Institute for Materials Research and Testing, Division 5.3, D-12205 Berlin, Germany;3. Laboratory of Solid-State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg, 44 B-3001 Leuven, Belgium;2. Center for Design, Manufacturing and Materials, Skolkovo Institute of Science and Technology, Nobel St. 3, Skolkovo Innovation Center, 143026 Moscow, Russian Federation;1. LP&MC – Nanomaterials Research Group, Department of Physics, FCEyN-UBA and IFIBA-CONICET. Ciudad Universitaria, 1428 Buenos Aires, Argentina;2. Leibniz-Institut für Polymerforschung Dresden, Hohe Straße 6, 01069 Dresden, Germany;3. INQUIMAE-CONICET. Ciudad Universitaria 1428, Buenos Aires, Argentina and Escuela de Ciencia and Tecnologia, UNSAM Campus Miguelete, San Martín, Bs. As., Argentina;4. Department of Materials (GIDAT-CAC), Comisión Nacional de Energia Atómica, San Martín 1499, Argentina |
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| Abstract: | Radially aligned carbon nanotubes (A-CNTs) grown on micron-scale fibers promise structural composites with high mechanical performance and multi-functional properties. Changes in the internal structure of woven composite laminates after A-CNT growth are studied here utilizing micro-computed tomography. The laminates are produced by vacuum impregnation in a closed mold with and without clamping pressure. Two A-CNT lengths are investigated: 4–6 μm and 17–19 μm. A-CNTs were found to increase the distance between fibers, scaled by the A-CNT length. This “swelling” resulted in an increased cross-sectional area, crimp and in-plane misalignment of the yarns. The laminate thickness doubled for laminates with long A-CNTs compared to shorter ones. The laminate with long A-CNTs produced under pressure showed a remarkable alteration of the internal structure. Fibers migrated within the fabric plane, filling almost completely the resin rich pockets. Further research is needed to understand the effect of these changes on the composite mechanical performance. |
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| Keywords: | A Polymer-matrix composites A Nano-structures B Microstructures D CT analysis |
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