Engraving process analysis of projectiles based on coupling of FEM and SPH

Based on the coupling algorithm of finite element method( FEM) and smoothed particle hydrodynamics( SPH) method,the dynamic model of a projectile-barrel coupled system was established. The numerical simulation of the engraving process of projectiles of a heavy caliber gun was performed,it remedied the deficiencies of FEM,FEM couldn't simulate the large deformation of a bearing band effectively. The plastic flow of the bearing band was successfully simulated in the engraving process of projectiles. Furthermore,the stress and strain varying laws of the bearing band were intensively studied. The influences of initial loading angle of projectile,gap between barrel and projectile and projectile not filled in position on the dynamic responses of a projectile in the engraving process were analyzed. The results showed that the deformations of the bearing bend obtained with simulation agrees well with those measured in live weapon firings.