基于数值模型的螺栓预紧力对板间微动行为影响研究  

Effects of Bolt Preload on Plate Fretting Behavior of 2024 Aluminum Alloy Laminates Based on Numerical Model

作　　者：杜坤鹏 王天立 史建猛 邱建平 齐振超[2] DU Kunpeng;WANG Tianli;SHI Jianmeng;QIU Jianping;QI Zhenchao(AVIC Xi'an Aircraft Industry Group Co.,Ltd.,Xi'an 710089,China;College of Mechanical and Electronic Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中航西安飞机工业集团股份有限公司,陕西西安710089 [2]南京航空航天大学机电学院,江苏南京210016

出　　处：《机械制造与自动化》2024年第6期164-167,184,共5页Machine Building & Automation

摘　　要：螺栓预紧力是影响搭接件疲劳特性的重要参数,不同预紧力大小影响结构内部应力分布及疲劳微动特征。建立2024铝合金叠层板搭接试件螺栓连接预紧及试件拉伸的数值模型,分析不同预紧力作用下试件内部受力及叠层间微动特征。结果表明:螺栓连接可以改变带孔板拉伸孔周受力分布,可一定程度上减小连接孔引起的应力集中现象。随着预紧力的增大,叠层之间通过摩擦传递的载荷增大,孔边应力集中系数会随之减小。接触面上较高的摩擦切应力区域主要出现在连接孔拉伸方向的前后两侧,但微动幅值最大的位置出现在孔的两侧,并且随着预紧力的增大而减小。Bolt preload is an important parameter affecting the fatigue characteristics of lapping parts,and different preloading forces affect the stress distribution and fatigue fretting characteristics.The numerical models of bolt connection pre-tightening and tensile of 2024 aluminum alloy laminated plate lap specimens were established,and the specimens'internal forces and interlaminated fretting characteristics under different preloading forces were analyzed.The results show that the bolt connection can change the stress distribution around the hole and reduce the stress concentration caused by the hole to some extent.With the increase of preload,the load transmitted by friction between layers increases,and the stress concentration coefficient at hole edge decreases.The higher frictional shear stress region on the contact surface mainly appears on both sides of the stretching direction of the connecting hole,but the position with the maximum fretting amplitude appears on both sides of the hole and decreases with the increase of the preloading force.

关 键 词：2024铝合金 叠层板 螺栓连接 预紧力 数值模拟 微动磨损 微动幅值 

分 类 号：TH131[机械工程—机械制造及自动化]