Understanding interlaminar toughening of unidirectional CFRP laminates with carbon nanotube veils
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In this article, the failure mechanism and interlayer microstructure of aerospace-grade structural composites reinforced with thin veils of carbon nanotube produced using an industrialised spinning process were studied.Abstract:
The introduction of nanostructured interlayers is one of the most promising strategies for interlaminar reinforcement in structural composites. In this work, we study the failure mechanism and interlayer microstructure of aerospace-grade structural composites reinforced with thin veils of carbon nanotube produced using an industrialised spinning process. Samples of unidirectional carbon fiber/epoxy matrix composites interleaved with different composition CNT veils were prepared using hot press method and tested for interlaminar fracture toughness (IFT), measured in Mode-I (opening) and Mode-II (in-plane shear), and for interlaminar shear strength (ILSS), evaluated by the short beam shear (SBS) test. The crack propagation mode could be directly determined through fractography analysis by electron microscopy and resin/CNT spatial discrimination by Raman spectroscopy, showing a clear correlation between interlaminar reinforcement and the balance between cohesive/adhesive failure mode at the interlayer region. Composites with full resin infiltration of the CNT veils give a large increase of Mode II IFT (88%) to 1500 J/m2 and a slight enhancement of apparent interlaminar shear strength (6.5%), but a decrease of Mode I IFT (−21%). A toughening factor, defined as the relative increase in toughness per interleaf-to-ply thickness ratio, give a record-high value of 15.8 for Mode II IFT. The results help establish the role of interlayer infiltration, interlaminar crossings and formation of a carbon fiber bridgings, for interlaminar reinforcement with interleaves.read more
Citations
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Effective interlaminar reinforcing and delamination monitoring of carbon fibrous composites using a novel nano-carbon woven grid
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A review of recent progress in improving the fracture toughness of epoxy‐based composites using carbonaceous nanofillers
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TL;DR: In this article , the authors present research progress during the last six years on the toughening of EPs using CNTs, Gr, and CNT-Gr hybrids.
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Graphene and carbon nanotube-based high-sensitive film sensors for in-situ monitoring out-of-plane shear damage of epoxy composites
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Raman spectroscopy of carbon materials and their composites: graphene, nanotubes and fibres
TL;DR: Raman spectroscopy is now an extremely important technique for the analysis of carbon-based materials and it can be used to give a unique insight into characterising many aspects of the microstructure of these materials, including orientation, number of layers, defects and doping, enabling standardisation and quality control as discussed by the authors .
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Comparison of Impact Resistance of Carbon Fibre Composites with Multiple Ultra-thin CNT, Aramid pulp, PBO and Graphene Interlayers
TL;DR: In this article , the impact properties of carbon fibre reinforced polymer (CFRP) laminates with multiple ultra-thin interlayers of multi-wall carbon nanotubes (CNTs) Aramid pulp (AP) micro/nano-fibres, poly (p-phenylene-2,6-benzobisoxazole) (PBO) fibres and multi-layer graphene were compared.
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