Abstract:The dynamic seal performance of lip seal of artillery recoil brake when artillery firing at high speed was studied. The working principle of lip seal was analyzed, and the seal failure mechanism was studied by using the microstructure analysis method. Through the rubber mechanical properties testing and fitting optimization, the hyperelastic constitutive model of rubber was identified, and the sealing ring axisymmetric finite element model was established based on ABAQUS. The recoil brake parameters such as recoil displacement, recoil velocity and hydraulic pressure under the condition of different charge were solved by using the simulation software of ADAMS. The seal ring installation, static seal and dynamic seal condition were simulated by considering the effect of the initial amount of interference, the friction coefficient, the changing oil pressure and the relative velocity of dynamic seal. According to the seal failure criterion, the lip seal dynamic sealing performance was researched under two typical changeable hydraulic shock. This study result has certain reference value for mastering the law of sealing ring life under artillery firing condition.