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

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.