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Enhancing the Fracture Toughness Properties by Introducing Anchored Nano-Architectures at the Metal–FRP Composite Interface

Sir Lawrence Wackett Aerospace Research Centre, School of Engineering, RMIT University, Melbourne, VIC 3001, Australia
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J. Compos. Sci. 2019, 3(1), 17; https://doi.org/10.3390/jcs3010017
Received: 30 December 2018 / Revised: 8 February 2019 / Accepted: 11 February 2019 / Published: 13 February 2019
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Abstract

This paper presents a novel technique for improving aluminium–glass/epoxy composite interfacial bonding through the generation of metallic nano-architectures on the metal surface. Silver nanowires (AgNWs) deposited via solution casting at varying concentrations and annealed at different temperatures in an air atmosphere improved the aluminium-glass/epoxy composite fracture toughness as measured via mode I experiments. For AgNW concentrations of 1 and 3 g/m2 deposited via a single-stage process and annealed at 375 °C, the initiation fracture toughness of the aluminium-glass/epoxy composite improved by 86% and 157%, respectively, relative to the baseline composite without AgNWs. The corresponding steady-state fracture toughness of these nano-modified fibre metal laminates (FMLs) were at least seven times greater than the baseline composite. The FML variant in which AgNWs were deposited at a concentration of 3 g/m2 through a two-stage process followed by annealing at 375 °C and 300 °C, respectively after each deposition, achieved the highest steady-state fracture toughness of all nano-modified composites—a fracture toughness value that was 13 times greater than the baseline composite. Intrinsic and extrinsic toughening mechanisms dictated by the morphology of the silver nano-architectures were found to be responsible for the improved initiation and steady-state fracture toughness in nano-modified FMLs. View Full-Text
Keywords: fibre metal laminates (FMLs); interleaving; mode I fracture toughness fibre metal laminates (FMLs); interleaving; mode I fracture toughness
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Mahendrarajah, G.; Kandare, E.; Khatibi, A.A. Enhancing the Fracture Toughness Properties by Introducing Anchored Nano-Architectures at the Metal–FRP Composite Interface. J. Compos. Sci. 2019, 3, 17.

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