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Fibers 2019, 7(2), 13; https://doi.org/10.3390/fib7020013

Damage Characterization of Nano-Interleaved CFRP under Static and Fatigue Loading

1
Department of Design and Mathematics, University of the West of England, BS16 1QY Bristol, UK
2
Department of Industrial Engineering, University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
3
Mechanical Engineering Department, University of Tabriz, Tabriz 51666-14766, Iran
4
Department of Mechanical Engineering, Tafresh University, Tehran Road, Tafresh 79611-39518, Iran
*
Author to whom correspondence should be addressed.
Received: 28 November 2018 / Revised: 16 January 2019 / Accepted: 19 January 2019 / Published: 28 January 2019
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Abstract

The use of high strength-to-weight ratio-laminated fiber-reinforced composites is emerging in engineering sectors such as aerospace, marine and automotive to improve productivity. Nevertheless, delamination between the layers is a limiting factor for the wider application of laminated composites, as it reduces the stiffness and strengths of the structure. Previous studies have proven that ply interface nanofibrous fiber reinforcement has an effective influence on delamination resistance of laminated composite materials. This paper aims to investigate the effect of nanofiber ply interface reinforcement on mode I properties and failure responses when being subjected to static and fatigue loadings. For this purpose, virgin and nanomodified woven laminates were subjected to Double Cantilever Beam (DCB) experiments. Static and fatigue tests were performed in accordance with standards and the Acoustic Emissions (AE) were acquired during these tests. The results showed not only a 130% increase of delamination toughness for nanomodified specimens in the case of static loads, but also a relevant crack growth resistance in the case of fatigue loads. In addition, the AE permitted to relate these improvements to the different failure mechanisms occurring. View Full-Text
Keywords: nanofibers; composites; interleaving; fatigue; delamination; acoustic emission (AE); failure mechanisms nanofibers; composites; interleaving; fatigue; delamination; acoustic emission (AE); failure mechanisms
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Fotouhi, M.; Fragassa, C.; Fotouhi, S.; Saghafi, H.; Minak, G. Damage Characterization of Nano-Interleaved CFRP under Static and Fatigue Loading. Fibers 2019, 7, 13.

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