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Impact behavior and fractographic study of carbon nanotubes grafted carbon fiber-reinforced epoxy matrix multi-scale hybrid composites |
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| Affiliation: | 1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi''an 710072, China;2. Center for Nano Energy Materials, Northwestern Polytechnical University, Xi''an 710072, China;1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 — bus 2450, B-3001 Leuven, Belgium;2. Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;3. Laboratory of Solid-State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;1. Department of Mechanical Engineering, Aeronautics Institute of Technology – ITA, Praça Marechal Eduardo Gomes 50, São José dos Campos 12228-900, SP, Brazil;2. Department of Aeronautics, Aeronautics Institute of Technology – ITA, Praça Marechal Eduardo Gomes 50, São José dos Campos 12228-900, SP, Brazil;3. Institute of Science and Technology, Federal University of São Paulo – UNIFESP, Rua Talim 330, São José dos Campos 12231-280, SP, Brazil |
| Abstract: | Carbon nanotubes are the most promising reinforcement for high performance composites. Multiwall carbon nanotubes were directly grown onto the carbon fiber surface by catalytic thermal chemical vapor deposition technique. Multi-scale hybrid composites were fabricated using the carbon nanotubes grown fibers with epoxy matrix. Morphology of the grown carbon nanotubes was investigated using field emission scanning electron microscopy and transmission electron microscopy. The fabricated composites were subjected to impact tests which showed 48.7% and 42.2% higher energy absorption in Charpy and Izod impact tests respectively. Fractographic analysis of the impact tested specimens revealed the presence of carbon nanotubes both at the fiber surface and within the matrix which explained the reason for improved energy absorption capability of these composites. Carbon nanotubes presence at various cracks formed during loading provided a direct evidence of micro crack bridging. Thus the enhanced fracture strength of these composites is attributed to stronger fiber–matrix interfacial bonding and simultaneous matrix strengthening due to the grown carbon nanotubes. |
| Keywords: | A. Carbon fiber B. Fiber–matrix bonding D. Fractography E. Chemical vapor deposition |
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