为了研究多因素耦合下橡胶O形圈密封性能参数的变化规律,利用ABAQUS有限元软件建立中低压氢环境下法兰密封组件二维模型。通过对比发现,压力0.5~2.0 MPa纯氢环境下橡胶O形圈密封性能参数随截面直径增大而无明显变化;压力升至5.0 MPa时,纯氢环境下橡胶O形圈的接触应力和Mises应力显著增大,若进一步增大截面直径,接触应力增大以及Mises应力减小可提高密封系统的密封性能。接触应力随压力和预压缩率增大而增大,但Mises应力与气体压力、预压缩率之间关系较为复杂,氢气压力≤1.0 MPa时Mises应力峰值随预压缩率增大而增大,对密封不利;氢气压力为2.0 MPa时Mises应力峰值随预压缩率增大呈先减后增趋势,Mises应力存在极小值;氢气压力为5.0 MPa时接触应力峰值随预压缩率增大反而减小,可提高组件密封性能。中低压氢环境下橡胶O形圈的吸氢膨胀效应较小,截面直径和施加预压缩率一定时，掺氢比的改变对橡胶O形圈的密封性能参数未产生明显影响。研究成果可为纯氢或掺氢管道密封系统研究提供有效参考。

To investigate the changing patterns of rubber O-ring sealing performance parameters under multi-factor coupling, ABAQUS finite element software is used to establish a two-dimensional model of the flange sealing assembly under low-and-medium pressure hydrogen environments. Through comparison, it is found that the sealing performance parameters of the O-rings do not change significantly with the cross-section diameter under the pure hydrogen pressure of 0.5~2.0 MPa. When the pressure is increased to 5.0 MPa, the contact stress and Mises stress of the seals increase significantly under pure hydrogen environment. Further increasing the cross-section diameter leads to increased contact stress and decreased Mises stress, which in turn improves the sealing performance of the sealing system. The contact stress increases with increasing pressure and pre-compression rate, but the relationship between Mises stress and gas pressure and pre-compression rate is more complicated. When pressure is ≤1.0 MPa, the peak Mises stress increases with increasing pre-compression, which is unfavorable for the sealing. At a pressure of 2.0 MPa, the peak Mises stress shows a decreasing then increasing trend with increasing pre-compression rate, indicating a minimum value of Mises stress. At 5.0 MPa, the peak stress decreases with increasing pre-compression rate, which can improve the sealing performance of the assembly. The hydrogen swelling effect of rubber O-rings is relatively small in low and medium pressure hydrogen environments. Change in the hydrogen blending ratio did not significantly affect the sealing performance parameters of the rubber O-rings when the cross-sectional diameter and the pre-compression ratio were fixed. The research results can provide an effective reference for the study of pure hydrogen or hydrogen-blended pipeline sealing systems.