Abstract Low interlaminar mechanical properties is the foremost drawback of glass fiber reinforced composites (GFRPs). Hierarchical nanoparticles on fibers (e.g. carbon nanotubes (CNTs)) can improve interlaminar properties of composites with negligible weight increase because of excellent mechanical properties, and low density. Interlaminar properties of composites can be enhanced with the well-dispersed CNTs in polymer matrices as it facilitates load transfer from matrix to fibers. This paper investigates the mechanical properties of CNT-reinforced GFRPs. Two reinforcing strategies were studied as dispersion of CNTs in epoxy matrix and direct growth of CNTs onto glass fibers (GFs), simultaneously. The former is referred to as nanotube-reinforced composites (NRCs) while the latter is known as fuzzy architectures. Furthermore, the combination of NRCs and fuzzy glass fibers (F-GFs), also known as fuzzy nano-reinforced composites (F-NRCs), is used to fabricate composites and identify the reinforcing capabilities through both methods. Mechanical properties are investigated by Mode-I fracture toughness and unidirectional (UD) composite tensile tests. Even though NRCs and F-NRCs yield similar enhancements in the propagation fracture toughness as 113% and 119%, respectively, the tensile strength of F-NRCs is decreased by 24% due to heat treatment during the CNT synthesis.

中文翻译：

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模糊CNT-玻璃纤维增​​强复合材料的断裂韧性增强与组合增强策略

摘要 低层间力学性能是玻璃纤维增​​强复合材料（GFRPs）的首要缺点。由于优异的机械性能和低密度，纤维上的分层纳米粒子（例如碳纳米管（CNT））可以改善复合材料的层间性能，而重量增加可以忽略不计。碳纳米管在聚合物基质中分散良好，可以增强复合材料的层间性能，因为它有助于将载荷从基质转移到纤维。本文研究了碳纳米管增强玻璃纤维增​​强塑料的机械性能。研究了两种增强策略，即碳纳米管在环氧树脂基质中的分散和碳纳米管同时在玻璃纤维 (GF) 上的直接生长。前者被称为纳米管增强复合材料 (NRC)，而后者被称为模糊结构。此外，NRC 和模糊玻璃纤维 (F-GF) 的组合，也称为模糊纳米增强复合材料 (F-NRC)，用于制造复合材料并通过两种方法确定增强能力。通过 I 型断裂韧性和单向 (UD) 复合材料拉伸试验研究机械性能。尽管 NRC 和 F-NRC 的传播断裂韧性分别提高了 113% 和 119%，但由于 CNT 合成过程中的热处理，F-NRC 的拉伸强度降低了 24%。