Thermoplastic interleaving is a promising technique to improve delamination resistance of laminated composites. In this study, plain-weave carbon fiber/epoxy composites were interleaved with nylon 6,6 nonwoven fabrics with an areal weight density of 17 gsm. The carbon fiber/epoxy composite laminates with/without nylon 6,6 nonwoven fabric interlayers were manufactured by VARTM technique. Double cantilever beam fracture toughness tests were carried out on the prepared composite test specimens in accordance with ASTM 5528 standard. The experimental test data were statistically analyzed by two-parameter Weibull distribution. The results showed that the initiation and propagation fracture toughness Mode-I fracture toughness of carbon fiber/epoxy composites could be improved by about 34 and 156% (corresponding to a reliability level of 0.50) with the incorporation of nylon 6,6 interlayers in the interlaminar region, respectively. The results also revealed that the percent increase in the propagation fracture toughness value was 67 and 41% at reliability levels of 0.90 and 0.95, respectively.

中文翻译：

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碳纤维/环氧树脂复合材料与尼龙 6,6 无纺布夹层交织的实验和统计分析

热塑性交织是一种很有前途的技术，可以提高层压复合材料的抗分层性。在这项研究中，平纹碳纤维/环氧树脂复合材料与尼龙 6,6 无纺布交织，面重密度为 17 gsm。带有/不带有尼龙 6,6 无纺布夹层的碳纤维/环氧树脂复合层压板是通过 VARTM 技术制造的。根据ASTM 5528标准对制备的复合材料试样进行双悬臂梁断裂韧性试验。实验测试数据采用二参数威布尔分布进行统计分析。结果表明，碳纤维/环氧树脂复合材料的起始和扩展断裂韧度Mode-I断裂韧度可提高约34%和156%（对应0.0%的可靠性水平）。50) 分别在层间区域加入尼龙 6,6 夹层。结果还表明，在 0.90 和 0.95 的可靠性水平下，传播断裂韧性值的增加百分比分别为 67% 和 41%。