金属“O”环强度可靠性的概率有限元分析  

Reliability Analysis for Structure Strength of Metal O-ring Based on Probability Finite Element Method

作　　者：周密[1] 谢俊[1] 杨田[1] 张冬林[2] 姜圣翰[2] 李晓钟[2] 

机构地区：[1]四川大学化学工程学院,成都610065 [2]中国核动力设计院,成都610041

出　　处：《核动力工程》2010年第1期70-73,78,共5页Nuclear Power Engineering

摘　　要：金属"O"环作为安全阀的静密封元件,要求具备极高的密封可靠性。论文基于ANSYS软件,采用弹塑性接触分析法建立了金属"O"环的有限元模型,分析了设计工况下"O"环的变形以及应力分布。以此为基础,利用ANSYS的结构可靠性分析模块PDS,对"O"环进行了强度可靠性的概率有限元分析计算。结果表明:循环模拟2000次可以足够满足精度要求;材料强度极限是最重要的随机输入变量,减小其分散程度,可提高"O"环密封结构的可靠性。Metal O-rings was required as a high reliability sealing element in the safety valve for the application in nuclear power plants. The finite element model for the metal O-rings was constructed with the method of elastoplastic contact analysis based on the ANSYS software. The deformation and equivalence stress distribution of the metal O-rings have been obtained. The Probabilistic Finite Element Analysis for the Structure Strength of Metal O-ring has been done with the ANSYS Probabilistic Design System （PDS）. The analysis result indicates that the strength of the O-ring has high reliability. The strength limit of the material is the most important stochastic input parameter. The reliability of the O-ring can be improved by decreasing the dispersion of the property parameters of the material.

关 键 词：金属“O”环 概率有限元分析法 强度可靠性 

分 类 号：TB114.3[理学—概率论与数理统计] TH136[理学—数学]