Abstract This study focuses on the influence of cryogenic temperature on the interface of carbon fiber reinforced plastics (CFRPs). Results of interfacial shear strength (IFSS) and mode II interlaminar fracture toughness (GIIC) at −196°C increased by 15.3% and 27.6% compared to the condition at room temperature (RT). By measuring the IFSS at −196°C, a new experimental method was designed based on microbond test. The layer shear fracture morphologies of CFRP were observed by atomic force microscopy and scanning electron microscopy, respectively. In order to study the interlaminar fracture mechanism, the interface and resin fracture hybrid model was built, and the shear-lag theory of interfacial toughness was adopted to analyze the energy release rate (Gdc) of microbond. The results showed that the Gdc value was increased by 11.5% from RT to −196°C temperature. A higher GIIC of CFRP was dominated by the higher IFSS and resin energy absorption at −196°C.

中文翻译：

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碳纤维增强氰酸酯/环氧树脂复合材料在低温下的界面特性

摘要 本研究的重点是低温对碳纤维增强塑料（CFRPs）界面的影响。与室温 (RT) 条件相比，-196°C 下的界面剪切强度 (IFSS) 和模式 II 层间断裂韧性 (GIIC) 的结果分别增加了 15.3% 和 27.6%。通过在-196°C下测量IFSS，设计了一种基于微键测试的新实验方法。分别通过原子力显微镜和扫描电镜观察了CFRP的层剪切断口形貌。为研究层间断裂机理，建立界面与树脂断裂混合模型，采用界面韧性剪切滞后理论分析微键的能量释放率(Gdc)。结果表明，Gdc 值增加了 11。从室温到 -196°C 温度为 5%。CFRP 的 GIIC 较高，主要是在 -196°C 时较高的 IFSS 和树脂能量吸收。