管路连接件粗糙表面接触力学与密封性能分析  

Analysis of Contact Mechanics and Sealing Performance of Rough Surface of Pipeline Joints

作　　者：钱进 陈果[2] 赵正大 张旭 陈雪梅 QIAN Jin;CHEN Guo;ZHAO Zhengda;ZHANG Xu;CHEN Xuemei(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing Jiangsu 210016,China;College of General Aviation and Flight,Nanjing University of Aeronautics and Astronautics,Liyang Jiangsu 213300,China;Chengdu Aircraft Industrial(Group)Company Ltd.,Chengdu Sichuan 610092,China)

机构地区：[1]南京航空航天大学民航学院,江苏南京210016 [2]南京航空航天大学通用航空与飞行学院,江苏溧阳213300 [3]成都飞机工业(集团)有限责任公司,四川成都610092

出　　处：《润滑与密封》2024年第5期112-119,共8页Lubrication Engineering

基　　金：国家自然科学基金项目(52272436);成都飞机工业(集团)有限责任公司项目。

摘　　要：为研究真实管道连接件在拧紧力矩作用下的接触状态和密封机制,从而有效控制管路密封性能,以真实管路连接件为研究对象,对粗糙接触表面真实接触形貌数据进行实测,通过逆向建模工程建立粗糙接触表面有限元模型,利用有限元仿真分析方法得出真实接触面积比与平均接触应力的关系。结果表明,在开始施加位移载荷时同时发生弹性与塑性变形,随着载荷的增加,发生塑性变形区域越来越大,形成真实接触区域部分也逐渐增加。基于逾渗理论对接触界面进行栅格化模型模拟,通过寻径算法得出接触界面达到密封时所需要的最小真实接触面积比,结合仿真结果得到管路连接件接触表面达到密封时所需要的最小接触应力值。研究结果为管路连接件密封性能仿真分析提供重要密封评判指标,也进一步通过仿真分析得到管接头密封条件下的最小拧紧力矩提供参考。To study the contact state and sealing mechanism of real pipeline connectors under tightening torque so as to effectively control the sealing performance of pipelines,the real pipeline connectors were taken as the research object,and the real contact morphology data was measured.A finite element model of rough contact surface was established based on reverse modeling technology,and the relationship between the real contact area ratio and the average contact stress was ob-tained by using the finite element simulation analysis method.The results indicate that both elastic and plastic deformation occur simultaneously when the displacement load is applied.As the load increases,the area of plastic deformation becomes larger and the part that forms the real contact area gradually increases.Based on the percolation theory,the contact interface was modeled and simulated by grid modeling,and the minimum real contact area ratio required for the contact interface to achieve sealing was obtained by using the path finding algorithm.The minimum contact stress required for the contact sur-face of pipeline connectors to achieve sealing was obtained by combining the simulation results.The research results provide important sealing evaluation indicators for the simulation analysis of the sealing performance of pipeline connectors,and further provide reference for obtaining the minimum tightening torque of pipeline connectors under sealing conditions through simulation analysis.

关 键 词：粗糙表面 管路连接件 接触分析 栅格模型 密封性 

分 类 号：TB42[一般工业技术]