胶接结构的Ⅰ型界面断裂韧性研究进展

Research Progress on the Interface Mode Ⅰ Fracture Toughness of Bonded Structures

胶接结构相对机械连接有诸多优势,对于航空航天领域中广泛使用的纤维增强复合材料层合板的连接更为适用。胶接技术具有重量轻,连接件数目少,不引入新的孔损伤,抗疲劳性能好且能获得气动光滑面等突出优点,是复合材料连接结构设计中的优选方案。其中,胶接界面性能是研究的焦点问题之一。本文从胶接结构Ⅰ型界面断裂韧性测试的加载速率入手,将所有方法分为三大类,动态冲击加载、疲劳裂纹扩展和准静态裂纹扩展。其中,准静态裂纹扩展是使用最为频繁的,也是最能体现裂纹扩展过程的一种方法。本文从试验研究、理论分析和数值模拟三个方面对国内外在胶接结构界面断裂韧性准静态加载方面所取得的研究成果进行了系统综述,重点介绍了裂纹尖端识别方法,理论分析计算方法以及以粘聚区模型(CZM)为代表的数值模拟方法的研究现状,并对胶接结构Ⅰ型界面断裂韧性的影响因素进行综合总结,最后对胶黏剂材料、厚度以及表面处理方式对胶接结构性能的影响机制做了综述分析。

The bonded structure has many advantages over the mechanical connection,and is more suitable for the fiber reinforced composite laminates widely used in the aerospace field.Bonded technologies have many outstanding advantages,such as light weight,few parts,no new hole damage,good fatigue resistance and aerodynamic smooth surface,and have always been the preferred scheme in the design of composite joint structure.The adhesive interface performance is also one of the research focuses.In this paper,the loading rate of the fracture toughness analysis test of the mode Ⅰ interface of the bonded structure is used as the criterion.All methods are divided into three major categories,dynamic impact action,fatigue crack growth,and quasi-static crack growth.Among them,quasi-static crack growth is the most frequently used method,and it is also the best method that reflects the crack growth process.The research results obtained at home and abroad on the quasi-static loading of the interface fracture toughness of bonded structures are systematically reviewed from three aspects,experimental research,theoretical analysis and numerical simulation.It focuses on the research status of crack tip identification method,theoretical analysis calculation method and resin simulation method represented by the cohesive zone model(CZM),and comprehensively summarizes the influencing factors of the fracture toughness of the mode Ⅰ interface of the bonded structure.The influence mechanism of adhesive material,thickness and surface treatment on adhesive structural properties was summarized.