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Open AccessArticle

Influence of Particle Size on Toughening Mechanisms of Layered Silicates in CFRP

1
Bavarian Polymer Institute and Department of Polymer Engineering, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
2
Bavarian Polymer Institute and Department of Inorganic Chemistry I, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany
*
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2396; https://doi.org/10.3390/ma13102396
Received: 3 April 2020 / Revised: 19 May 2020 / Accepted: 20 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Advances in Fiber-Reinforced Polymer Composites)
Carbon-fiber-reinforced epoxies are frequently used for lightweight applications that require high mechanical properties. Still, there is potential regarding the improvement of the interlaminar-fracture toughness. As matrix toughening with nanoparticles is one possibility, in this study two different layered silicates are used to reinforce carbon fiber composites. The first type is a synthetical K-Hectorite (K-Hect) with outstanding lateral extension (6 µm) that has shown high toughening ability in resins in previous work. The other is a commercial montmorillonite (MMT) with a smaller size (400 nm). The aim of this study is to show the influence of the particles on mode I and mode II fracture toughness, especially the influence of particle size. Therefore, double-cantilever-beam tests and end-notched-flexure tests were carried out. Additionally, the fracture mechanisms were investigated via scanning electron microscopy (SEM). It is concluded, that the larger Hectorite particles are beneficial for mode I fracture behavior because of enhanced toughening mechanisms. One the other hand, the mode II energy dissipation rate is increased by the smaller montmorillonite particles due to sufficient interaction with the formation of hackling structures. View Full-Text
Keywords: interlaminar-fracture toughness; layered silicate; carbon-fiber-reinforced composite; prepreg interlaminar-fracture toughness; layered silicate; carbon-fiber-reinforced composite; prepreg
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Hutschreuther, J.; Kunz, R.; Breu, J.; Altstädt, V. Influence of Particle Size on Toughening Mechanisms of Layered Silicates in CFRP. Materials 2020, 13, 2396.

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