Abstract Fibre reinforced hierarchical composites further reinforced with up to 25 wt% of carbon nanotubes (CNTs) were manufactured using a wet powder impregnation route. Microstructural heterogeneity in the matrix of these laminates was engineered during wet powder impregnation to produce CNTs rich regions with spatial separation. The Mode I fracture toughness of these heterogeneous hierarchical composites increased by 41% and 26% compared to that of baseline carbon fibre epoxy composites and hierarchical composites with homogeneously distributed CNTs throughout the matrix with similar CNT content, respectively. Increased crack path tortuosity was observed to contribute to this increase in fracture toughness. The interlaminar shear strength was unaffected by the matrix microstructural heterogeneity.

中文翻译：

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具有工程基体微结构的分级碳纳米管增强碳纤维环氧树脂复合材料的断裂韧性增强

摘要 使用湿粉浸渍路线制造了纤维增强的分级复合材料，该复合材料用高达 25 wt% 的碳纳米管 (CNT) 进一步增强。这些层压板的基质中的微结构异质性是在湿粉浸渍过程中设计的，以产生具有空间分离的富含碳纳米管的区域。与基线碳纤维环氧树脂复合材料和在整个基体中均匀分布碳纳米管且碳纳米管含量相似的分层复合材料相比，这些异质分层复合材料的 I 型断裂韧性分别增加了 41% 和 26%。观察到裂纹路径弯曲度的增加有助于这种断裂韧性的增加。层间剪切强度不受基质显微结构异质性的影响。