Sealing performance analysis of Oring seals in deepsea and high pressure environment
                                                                          FAN Zhimin, LI Long, WANG Qilin
             (College of Mechanical and Electrical Engineering, Qingdao Universityof Science and Technology, Qingdao 266061, China)

Abstract: Aiming at insufficient research on Oring seals for sealed shell in deep sea and high pressure environment , the contact stress and stress distribution of Oring seals under different compression ratio, different hardness and high medium pressure were studied. The method of judging the failure of the Oring seals was summarized. A method based on failure criteria to determine the maximum pressure of Oring seals in deep sea was proposed. Nonlinear finite element analysis methods were used for analysis and prediction. The results indicate that the compression rate and material hardness has an important influence on the sealing ability of the Oring seals. The change of medium pressure can cause the change of internal stress distribution in the O ring seals. Nitrile rubber Oring with material hardness of 90HA can meet the sealing requirement of 5000 meters water depth under 21% compression condition.

Key words: sealed shell; Oring seals; nonlinear finite element; contact pressure