Abstract Adhesive bonding has been applied successfully in many technologies. The short aramid fibers can be effectively embedded in interface layer wit adhesive-rich regions of the CFRP fabrics with carbon fibers oriented at 0° and 90° to form a strong pulling resistance. In this paper, the interface toughness of carbon fiber composite reinforced by aramid short fiber is studied based on the mode I crack growth test of double cantilever beam. The effort of the length and density of aramid short fiber on the interface toughness of carbon fiber composite are discussed. The test result shows that the best bonding strength is obtained at the condition of the aramid fibers with the length of 3 mm at the density of 24 g/m2. The ultimate load and the Mode I interlaminar fracture toughness are improved by 292.87% and 168.59%, respectively. The crack propagation path and fracture effect are analyzed and compared by Scanning Electron Microscopy (SEM) observations.

中文翻译：

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芳纶短纤维增强CFRP层压板的I型层间断裂韧性

摘要 胶粘剂在许多技术中得到了成功的应用。短芳纶纤维可以有效地嵌入界面层与碳纤维以0°和90°取向的CFRP织物的富粘合剂区域，形成强大的抗拉力。本文基于双悬臂梁I型裂纹扩展试验研究芳纶短纤维增强碳纤维复合材料的界面韧性。讨论了芳纶短纤维的长度和密度对碳纤维复合材料界面韧性的影响。测试结果表明，芳纶纤维在长度为3 mm、密度为24 g/m2的条件下获得最佳结合强度。极限载荷和I型层间断裂韧性分别提高了292.87%和168.59%。