Reliability Analysis for Structure Strength of Metal O-ring Based on Probability Finite Element Method
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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。Abstract: Metal O-rings was required as a high reliability sealing element in the safety valve for the ap-plication 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.
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Key words:
- Metal o-ring /
- Probability finite element method /
- Strength reliability
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