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<p>The present work examines the effect of two different fiber orientations, 0/90°, and 0/90/ ± 45°, on the in-plane compressive behavior, in composite laminates modified with varying weight percent (0.1, 0.3, and 0.5) of graphene. Functionalized graphene with three different functional groups (amine, carboxyl, and hydroxyl) was first incorporated in the epoxy resin through <i>in-situ</i> polymerization. Then the prepared matrices were directly applied to the carbon fiber layers using the hand layup method to build the composite laminates. The results showed a maximum improvement of 262.22% and 209.01% in the in-plane compressive strength of the 0/90°–H<sub>0.3</sub> and 0/90/ ± 45°–H<sub>0.5</sub> composite laminates, respectively, compared with the neat epoxy laminate. Furthermore, the infusion of –COOH-functionalized graphene into epoxy improved the in-plane compressive strength of composite laminates by 242.35% and 98.66% with 0/90°–COOH<sub>0.3</sub> and 0/90/ ± 45°–COOH<sub>0.5</sub>, respectively, compared to neat epoxy laminates. Field emission scanning electron microscopy (FE-SEM) revealed that the failure mechanism of carbon fibers pulled out of the epoxy matrix improved the epoxy's in-plane compressive strength. These results showed that functionalized graphene could strengthen the interfacial bonding between the carbon fiber layers and the epoxy resin. Evaluating the in-plane compressive strength of carbon fiber epoxy composites enables designers to optimize materials for specific loading conditions across diverse applications, such as lightweight military components and creating wind turbine blades that can endure compressive loads from wind forces.</p>

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Double-Notched In-Plane Compressive Strength of Unidirectional Carbon Fiber-Reinforced Graphene/Epoxy Composites: Effects of Functional Groups, Filler Concentration, and Fiber Orientation

  • 期刊论文

  • 发表日期：

    2025年4月16日

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  • Amit Kumar

摘要

The present work examines the effect of two different fiber orientations, 0/90°, and 0/90/ ± 45°, on the in-plane compressive behavior, in composite laminates modified with varying weight percent (0.1, 0.3, and 0.5) of graphene. Functionalized graphene with three different functional groups (amine, carboxyl, and hydroxyl) was first incorporated in the epoxy resin through in-situ polymerization. Then the prepared matrices were directly applied to the carbon fiber layers using the hand layup method to build the composite laminates. The results showed a maximum improvement of 262.22% and 209.01% in the in-plane compressive strength of the 0/90°–H0.3 and 0/90/ ± 45°–H0.5 composite laminates, respectively, compared with the neat epoxy laminate. Furthermore, the infusion of –COOH-functionalized graphene into epoxy improved the in-plane compressive strength of composite laminates by 242.35% and 98.66% with 0/90°–COOH0.3 and 0/90/ ± 45°–COOH0.5, respectively, compared to neat epoxy laminates. Field emission scanning electron microscopy (FE-SEM) revealed that the failure mechanism of carbon fibers pulled out of the epoxy matrix improved the epoxy's in-plane compressive strength. These results showed that functionalized graphene could strengthen the interfacial bonding between the carbon fiber layers and the epoxy resin. Evaluating the in-plane compressive strength of carbon fiber epoxy composites enables designers to optimize materials for specific loading conditions across diverse applications, such as lightweight military components and creating wind turbine blades that can endure compressive loads from wind forces.