Three‐point flexural fatigue behaviour and mode I interlaminar fracture toughness of the carbon fibre reinforced polymer composites (CFRPCs) modified by the addition of graphene nanoplatelet (GnP) were investigated. CFRPCs without any addition of nanoparticles were also tested as control samples. Fatigue life was characterized by the two parameter Weibull distribution function and predicted using the combined Weibull and Sigmoidal model. It was found that incorporation of very small amount (0.1%) of GnP in the epoxy polymer matrix improved mean and predicted fatigue life up to 155% and 190% (0.5 failure probability), respectively. The critical mode I interlaminar fracture toughness of the GnP reinforced composites was found up to 40% higher than the control samples. The improvement achieved by incorporating GnP is discussed in terms of crack deflection mechanism by nanoparticles and scanning electron micrograph images of the fracture specimens that revealed strong interfacial bonding in the nanoreinforced specimens.

中文翻译：

---

石墨烯增强碳纤维聚合物复合材料的疲劳分析和断裂韧性

研究了添加石墨烯纳米片（GnP）改性的碳纤维增强聚合物复合材料（CFRPC）的三点弯曲疲劳行为和I型层间断裂韧性。还测试了不添加任何纳米粒子的CFRPC作为对照样品。疲劳寿命的特征在于两个参数的威布尔分布函数，并使用威布尔和Sigmoidal组合模型进行预测。发现在环氧树脂聚合物基质中掺入极少量（0.1％）的GnP可使平均寿命和预测疲劳寿命分别提高至155％和190％（0.5失效概率）。发现GnP增强复合材料的临界模式I层间断裂韧性比对照样品高40％。