Abstract:The finite element model of capshaped slip ring type composite seals was set up by using ABAQUS.The sealing performances of the capshaped slip ring type composite seals under different working pressures,sealing gaps,moving speeds and friction coefficients were studied.It is found that the maximum contact stress between the piston rod and the Oring is the key factor affecting the sealing performance under static sealing conditions.With the increase of working pressure or the decrease of sealing gap,the maximum Von Mises stress of Orings and capshape ring is gradually increased,and the contact stress between surfaces is also gradually increased.Under dynamic sealing conditions,the contact stress is increased with the increase of working pressure or the decrease of sealing gap,when the sealing gap is 03 mm,the dynamic sealing performance of the composite seal is the optimal.With the increase of the friction coefficient,the contact stress is generally increased,while the moving speed has little effect on the contact stress.