Research On Damage Characteristics Of Water-filled Tank Impacted By High Velocity Projectile

In military operations,ships are often destroyed by many explosive fragments.These fragments carrying huge energy,if directly penetrate the ship's protective cabin,The damage of ships,It is not only simple as the local penetration perforation,but also will produce large bulge deformation and cracking failure.Therefore,liquid shock protection must be taken into consideration in the design and manufacture of naval vessels.In order to have sufficient theoretical basis for the defense technology and structural damage assessment of the cabin,the impact damage of the water-filled tank structure is studied in this paper.In the study of trajectory kinematics,a high speed camera is used to record the whole underwater movement of the high velocity projectile impacting the tank.Based on image pixel method,and introduce bullet resistance coefficient,obtained the projectile in the tank attenuation law of motion and the relationship between body position and underwater speed,the conclusion can be used to estimate projectile velocity in different positions under condition that different projectiles' resistance coefficient have known in advance.In the analysis of the pressure test,a cylindrical pressure tank with three pressure sensors is designed to carry out the pressure experiment.Based on the pressure signal test,the analysis of the liquid shock production,propagation and attenuation,then according to the total input energy of the tank system and bulging height data of the two deformation plates installed on the front and back sides of the tank,find the relationships between the input energy and the target plate bulge deformation,complete the tank-hit subject.Finally,based on the ABAQUS numerical simulation software,select the accurate simulation parameters,and establish the simulation model which is consistent with the actual experiment.The simulation data is compared with the experimental data.And the contrast results show that the simulation model is more reliable.In the reliable simulation results,the real-time variation of tank pressure and target plate is studied.The results show that separation of solid and liquid occurred during the target is subjected to liquid shock wave.In addition,it is found that the target plate under shock impact has a platform deformation in the middle of plate.As the deformation continues to increase,the platform region shrinks to the center,and finally disappears completely.