Abstract:In order to ensure effective sealing,the metal sealing ring in the submarine pipe connector must have good rebound characteristics and provide stable and reliable contact load.However,for the complex nonlinear structure,the deformation after pretightening installation cannot be predicted,it is difficult to achieve the theoretical calculation of the metal sealing ring and the error is easy to occur.In order to study the contact performance and rebound performance of metal sealing ring in connector,the twodimensional axisymmetric model of the sealing structure in the connector was established by the finite element software Abaqus,the influence of the initial compression ratio on the sealing performance of the seal rings with different diameterthickness ratio was analyzed.The damage condition,rebound characteristics and sealing reliability of the seal rings were characterized respectively by the stress state,the amount of compression rebound and the contact stress of the seal rings,and the feasibility interval of the compression ratio during the pretightening installation process was determined according to the relationship between the three and the initial compression ratio.The results show that the damage of the seal rings are likely to occur on both sides of the long semiaxis end of the elliptical section of the seal rings.With the increase of the initial compression ratio,the rebound amount of the seal rings is increased first and then decreased,and the rebound characteristics of the thinwalled seal ring is better than that of the thick walled seal ring with the same outer diameter.The feasibility interval of the thinwalled seal ring corresponding to the initial compression ratio is larger than that of the thickwalled seal ring with same outer diameter,which proves that the thinwalled seal rings have better sealing performance.The conclusion provides relevant basis for the selection and pretightening of the sealing ring.