安装状态的O形橡胶密封圈非线性有限元分析  

Nonlinear Finite Element Analysis of O-ring Sealing Considering Installation Condition

作　　者：米雄伟 MI Xiong-wei(Taiyuan Research Institute Co.,Ltd.,China Coal Technology and Engineering Group,Taiyuan,Shanxi 030006;Shanxi Tiandi Coal Mining Machinery Co.,Ltd.,Taiyuan,Shanxi 030006)

机构地区：[1]中国煤炭科工集团太原研究院有限公司,山西太原030006 [2]山西天地煤机装备有限公司,山西太原030006

出　　处：《液压与气动》2022年第12期18-23,共6页Chinese Hydraulics & Pneumatics

基　　金：国家重点研发计划(2020YFB1314003);山西省关键技术研发攻关专项(2020XXX001);山西天地煤机装备有限公司科技重大项目(400599,400634)。

摘　　要：在煤矿工程实践中,设备的工作寿命和密封性能与O形橡胶密封圈的装配工艺密切相关,因而有必要对O形圈的安装状态进行分析。以某型液压缸内O形圈为例,首先,基于橡胶材料的单轴拉伸实验得到其应力-应变曲线,通过对比发现Mooney-Rivlin模型能够很好的表征橡胶材料特性,并获得其材料参数;然后,利用ANSYS建立了O形圈安装状态的有限元模型并展开分析,获得了安装过程中的应力变化;最后,研究了不同摩擦系数、初始压缩率和安装圆角对O形圈所受应力的影响规律,指出其最佳安装状态。为O形圈的结构优化设计和失效分析提供了理论依据。In the practice of coal mine engineering,the working life and sealing performance of equipment are closely related to assembly process of O-ring,so it is necessary to analyze the installation state of O-ring.Taking O-ring in a certain type of hydraulic cylinder as an example,and the stress-strain curve is firstly obtained based on the uniaxial tensile experiment of rubber.By comparing with the fitted curve of Mooney-Rivlin model,it is found that the Mooney-Rivlin model can well characterize the properties of rubber and obtain its material parameters.Then,the finite element model of the installation state of O-ring is established by ANSYS,and the mechanical analysis is carried out to obtain stress distribution.Finally,the effects of different friction coefficients,compression and installation fillets on the stress of O-ring are studied,and the optimal installation state is pointed out.The results can provide a theoretical basis for the structural optimization design and failure analysis of O-rings.

关 键 词：O形密封圈 橡胶材料 Mooney-Rivlin模型 安装状态 非线性 

分 类 号：TH137[机械工程—机械制造及自动化]