沉头螺栓锪窝误差对复合材料连接结构承载性能影响分析  

Influence of Countersunk Bolt Geometry Error on the Bearing Performance of Composite joint Structure

作　　者：邹鹏 刘盈利 Zou Peng;Liu Yingli(National Key Laboratory of Strength and Structural Integrity,Aircraft Strength Research Institute of China,Xi’an 710065,China;Xi’an Changfeng Research Institute of Mechanism and Electricity,Xi’an 710072,China)

机构地区：[1]中国飞机强度研究所强度与结构完整性全国重点实验室,陕西西安710065 [2]西安长峰机电研究所,陕西西安710065

出　　处：《航空科学技术》2024年第6期37-43,共7页Aeronautical Science & Technology

基　　金：国家自然科学基金(52005458,52035011);航空科学基金(2018ZE23011)。

摘　　要：沉头螺栓作为现代飞机复合材料结构中的一种重要连接形式,其锪窝精度与装配质量直接影响结构服役性能。沉头螺栓因其能够保证连接结构表面齐平度,被广泛应用于飞机复合材料连接结构中。由于工艺和结构限制,锪窝角度误差和深度误差通常是不可避免的,并且对连接结构力学特性和承载能力造成影响。针对以上问题,本文开展了沉头螺栓锪窝几何误差对复合材料连接接头承载机理与强度影响研究。在角度误差、偏转方向误差以及深度误差定义分析的基础上,开展了不同误差下的加载试验并进行了显微分析。通过对加载曲线和界面形貌的分析,揭示了不同误差下的结构损伤机理和接头失效载荷,探究了锪窝几何误差对复合材料沉头螺栓单搭接接头力学行为的影响,为沉头螺栓在复合材料连接结构中的高效工程应用提供理论依据。As an important joint form in modern aircraft composite structures,countersunk bolts have a direct impact on the service performance of the structure due to their dimple accuracy and assembly quality.Countersunk bolts are widely used in aircraft composite joint structures due to their ability to ensure surface flatness of the joint structure.Due to process and structural limitations,dimple angle and depth errors are usually unavoidable and have an impact on the mechanical properties and load-bearing capacity of the jointing structures.In response to the above issues,this paper conducted a study on the impact of geometric errors in countersunk bolt dimpling on the load-bearing mechanism and strength of composite joints.Based on the definition of angle error,deflection direction error and depth error,loading experiments were conducted under different errors and microscopic analysis was conducted.By analyzing the loading curves and interface morphology,the structural damage mechanism and joint failure load under different errors were revealed,and the influence of dimple geometry error on the mechanical behavior of composite countersunk bolt single lap joint was explored,which provided theoretical basis for the efficient engineering application of countersunk bolts in composite joint structures.

关 键 词：沉头螺栓 角度误差 偏转方向误差 深度误差 损伤机理 失效载荷 

分 类 号：V262[航空宇航科学与技术—航空宇航制造工程] TB332[一般工业技术—材料科学与工程]