基于MS功能的超高压2K型斯特封有限元分析  

Finite Element Analysis of Ultra-high Pressure Step Seal 2K Based on MS Function

作　　者：刘颖 吕晓仁[1] 窦志伟[2] 项冲 黄乐 郭飞[3] LIU Ying;LV Xiaoren;DOU Zhiwei;XIANG Chong;HUANG Le;GUO Fei(College of Mechanical Engineering,Shenyang University of Technology,Shenyang Liaoning 110870,China;Shenyang Aircraft Design and Research Institute,The Aviation Industry Corporation of China,Shenyang Liaoning 110035,China;State Key Laboratory of Tribology,Tsinghua University,Beijing 100084,China;Guangzhou Mechanical Science Research Institute Co.,Ltd.,Guangzhou Guangdong 510700,China)

机构地区：[1]沈阳工业大学机械工程学院,辽宁沈阳110870 [2]中国航空工业集团公司沈阳飞机设计研究所,辽宁沈阳110035 [3]清华大学摩擦学国家重点实验室,北京100084 [4]广州机械科学研究院有限公司,广东广州510700

出　　处：《润滑与密封》2023年第6期124-132,共9页Lubrication Engineering

基　　金：国家重点研发计划项目(2021YFB3400601)。

摘　　要：利用ABAQUS软件的Map Solution(MS)功能对2K型斯特封进行有限元仿真分析,该功能通过重启动分析和网格重构技术,解决了由网格畸变引起计算中断的问题,得到超高压工况下的收敛解。根据流体压力14、28、35、42、56 MPa下斯特封内、外行程的应力应变云图和密封面接触压力分布曲线,研究流体压力对密封件主应力、主应变和接触压力分布的影响规律;同时对比未使用MS功能的高压工况(35 MPa)下仿真结果,验证了MS功能分析网格大变形问题的可靠性。结果表明:在超高压工况下,斯特封的最大主应力集中分布于空气侧PTFE阶梯形环与活塞沟槽、缸筒的接触区域,最大主应变出现在PTFE阶梯形密封环的卸荷角处;随着油液压力的增加,接触压力分布曲线趋势发生明显变化,空气侧的接触压力梯度减小;在相同流体压力下,外行程时密封面接触宽度大于内行程的接触宽度。The Map Solution(MS)function of ABAQUS software was used to perform finite element simulation analysis of 2K step seal.Through the restart analysis and the grid repartition technology,the problem of the computing interruption caused by the grid distortion was solved,and the convergence solution under the ultra-high pressure was obtained.According to the stress-strain cloud map and the contact pressure distribution curves of internal and external stroke under the fluid pressure loads of 14 MPa,28 MPa,35 MPa,42 MPa and 56 MPa,the influence of fluid pressure on the main stress,main strain and contact pressure distribution was studied,and the results with MS function were compared with the simulation results without MS function under high pressure condition(35 MPa).The reliability of the analytical large grid deformation problem was proved.The results show that under ultra-high pressure conditions,the maximum principal stress of the Step seal is concentrated in the contact area between the PTFE stepped ring on the air side and the piston groove and cylinder,and the maximum principal strain occurs at the unloading angle of the PTFE stepped seal ring.With the increase of oil pressure,the trend of contact pressure distribution curve changes obviously,and the contact pressure gradient near the air side decreases.Under the same fluid pressure,the contact width of the sealing face of the external stroke is greater than that of the internal stroke.

关 键 词：斯特封 Map Solution 超高压 接触压力 

分 类 号：TH136[机械工程—机械制造及自动化]