Abstract:The two-dimensional axial symmetric model of X-ring seal structure used in deep-sea hydraulic system was created by using the ANSYS software.The stress distribution of X-ring was calculated for different sealing conditions,and the impact of compression,sealing pressure,friction coefficient on its sealing performance and related stress was analyzed for different sealing condition.The results show that the stress is increased along with the increasing of compression rate,sealing pressure and friction coefficient.Some closed cavities are formed between inner side of X-ring and sealing groove,so the X-ring is not suitable to use in deep sea environment for static sealing.The impact of sealing pressure on contact stress,equivalent stress and shear stress is decreased in turn for loading sealing condition.The friction stress is gradually tended to be stabilized for the sliding sealing condition,and the sealing pressure and friction coefficient have a greater impact on the friction stress.