Strengthening in and fracture behaviour of CNT and carbon-fibre-reinforced epoxy–matrix hybrid composite

Shekar, K. Chandra; Prasad, B. Anjaneya; Prasad, N. Eswara

doi:10.1007/s12046-016-0566-8

Cited by 12 publications

(4 citation statements)

References 45 publications

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“…Due to pinning effect of CNTs causes the crack bridging of fibers perpendicular to the crack surface and it increases load required to propagation of crack 26 . Also, the presence of CNTs improves the adhesive forces between the resin and fibers, it leads to better fracture toughness and mechanical properties of composites 27 …”

Section: Resultsmentioning

confidence: 99%

“…26 Also, the presence of CNTs improves the adhesive forces between the resin and fibers, it leads to better fracture toughness and mechanical properties of composites. 27 The required energy for propagation crack was reduces at high temperatures, which causes the fracture toughness of composites to drop with temperature. The fracture toughness of polymer composites remarkably controls by plastic The matrix toughness and the interactions between the matrix and the fibers significantly largely depends on temperature and its effect on delamination mechanism and fracture toughness of composite.…”

Section: Fracture Toughnessmentioning

confidence: 99%

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Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Kiran,

Govindaraju,

Kumar

et al. 2023

Engineering Reports

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In present research the fracture behavior of carbon fabric‐epoxy composites (CE composites) was evaluated with the addition of 0.1, 0.2, 0.5, and 0.75 weight percentages of carbon nano tubes (CNTs) at different temperatures. The CE composites with different wt.% of CNT were fabricated using land layup method and cured by hot pressing. The fracture toughness of fabricated composites was evaluated in mode–I condition at different temperature. From the results it was shown that the highest fracture toughness was observed at 0.75 wt.% of reinforcement of CNT functional fillers. The fracture toughness of 0.75 wt.% CNT filled CE composites was increased by 19.73% compared to unfilled CE composites. The fracture toughness of CNT filled CE composites diminishes with increase in temperature and the composite filled with 0.75 wt.% CNT exhibits better fracture toughness than the unfilled CE composite at all the temperatures. The fracture toughness was improved by 57.76% and 71.65% at 40 and 60°C, respectively, at 0.75 wt.% reinforcement of CNT fillers. The fractured surfaces of composites were analyzed using Scanning Electron Microscope (SEM) to study the filler contribution to enhance the fracture toughness and failure mechanism of composites.

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Section: Resultsmentioning

confidence: 99%

Section: Fracture Toughnessmentioning

confidence: 99%

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Kiran,

Govindaraju,

Kumar

et al. 2023

Engineering Reports

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“…The length of the fibers should be long enough to form cross‐ply fiber‐bridging. Here, the commonly used CNT (less than 10 μm) [ 44,45 ] may not offer such effective cross‐ply toughening. Also, the fibers should not be too long to offer a limited fiber‐bridging effect using misaligned fiber that pushed into gaps of carbon fiber ply, like Aramid fiber (1–5 mm in length).…”

Section: Resultsmentioning

confidence: 99%

Compression‐after‐impact properties of carbon fiber composites with interlays of Aramid pulp micro‐/nanofibers

Yuan

et al. 2021

Polymer Composites

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The inherent resin-rich ply interfaces in laminar carbon fiber reinforced polymer (CFRP) composites are toughened by ultrathin interlays formed by Aramid pulp (AP) micro-/nanofibers, to show that stronger and more impactresistant CFRP can be manufactured with minimum disruption to the current composite forming process. Flexible nonwoven AP micro-/nano-fibers, less than 1 mm in length, can conveniently fit in the uneven surface profiles or microresin-rich areas between carbon fiber plies and form in situ quasi-Zdirectional fiber-bridging across the ply interfaces. CFRPs with multiple interfacial AP interlays estimated to be around 3 and 6 g/m 2 were tested before and after low energy impact. Ultrathin resin-rich ply-interface layers in plain CFRP were transformed into ultrathin "Short Aramid Fiber Epoxy" layers by the AP interlays (20-50 μm in thickness), leading to enhanced compressive energy absorption and up to 86.7% increase in Compression-After-Impact Strength. Keeping the interlay thin (around 30 μm or thinner if possible), even the compressive strength (without impact) is not compromised, and the energy absorption under compressive loading (without impact) is 130% higher. The distinctly different compressive failure mechanisms, delamination failure of the plain CFRP was transformed into matrix shear failure in AP-toughened CFRP, as identified by nondestructive X-ray microcomputed tomography scans.Scanning electron microscopy was performed on the failure surface to inspect the microscopic toughening mechanisms.

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“…26,27 Furthermore, carbon fibers are used as reinforcement in polymer composites due to benefits associated with its use such as high strength, high-temperature resistance, ease of manufacturing, low specific gravity, low coefficient of friction, light in weight and low wear. 28 Researchers reported that mechanical properties of polymer-based composites are significantly dependent upon loading conditions, fiber dimensions (length and diameter), orientation, and interaction between fiber and matrix. 29 In the past, researchers have investigated the wear behavior of various composites such as carbon fiber reinforced polyamide polymer composite, 29 carbon fiber–epoxy composite, 30 and carbon fiber/glass epoxy composite.…”

Section: Introductionmentioning

confidence: 99%

Investigations on erosion performance of carbon fiber–epoxy-based composite adhesion on 16Cr5Ni steel

Sharma¹,

Goyal

Bansal

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part E:

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This work presents a novel insight into slurry erosion behavior of thin layer of carbon fiber–epoxy-based composite adhered on 16Cr5Ni steel (adhesive coating) to evaluate its viability as a feasible candidate for slurry erosion applications. Experiments were conducted on a laboratory-developed slurry erosion test rig under accelerated conditions to study the effect erosion parameters namely slurry concentration, impact angle, and impact velocity. Under all the experimental conditions, adhesive coating showed better slurry erosion resistance in comparison with bare 16Cr5Ni steel specimens. Scanning electron microscopy analysis revealed that in the case of bare 16Cr5Ni steel; ploughing, micro-cutting, crater, plastic deformation, and lip formation were identified as main mechanism responsible for slurry erosion, whereas in the case of adhesive coating; pitting, cracking, fracturing, and shearing-off were found to be mainly responsible for material loss. It implies that adhesive coating showed a brittle mode of failure under slurry erosion conditions, whereas 16Cr5Ni steel exhibited a ductile mode of erosion.

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Strengthening in and fracture behaviour of CNT and carbon-fibre-reinforced epoxy–matrix hybrid composite

Cited by 12 publications

References 45 publications

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Effect of CNT filler and temperature on fracture toughness of epoxy composites reinforced with carbon fabric

Compression‐after‐impact properties of carbon fiber composites with interlays of Aramid pulp micro‐/nanofibers

Investigations on erosion performance of carbon fiber–epoxy-based composite adhesion on 16Cr5Ni steel

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