Investigation of Failure of Bolt Connection and Damage of Overloaded Component Caused by Armored Structure Impacted by High Velocity Kinetic Energy Projectile
The work aims to verify and reveal the damage mechanisms of armored structure impacted by high velocity ki-netic energy projectiles.Firstly,concentrated on the two mainly damage effects of failure of connections and damage of over-loaded component caused by armored structure impacted by high velocity kinetic energy projectiles,and with the bolt connec-tion as the typical example,the methods and materials model parameters of numerical simulation were validated by the con-ducted small scale tests of structure of bolt connection impacted by the high velocity sphere projectile.Secondly,the full scale tank impacted by high velocity kinetic energy projectiles was investigated by the numerical simulation and the analytical meth-ods of shock response spectrum,and the failure characterization of bolt connections,the mainly influencing factors,and the ac-celeration curves and shock response spectrum curves of the typical positions on the tank were obtained.The results showed that,the input kinetic energy value of 0.042 MJ in the small scale test could not cause the fracture of bolts,whereas,the input kinetic energy value of 25.6 MJ in the full scale tank could cause the failure of connections due to the fracture of bolts.The main reason of fracture of bolts was revealed by the results of numerical simulations.The value of input kinetic energy,the diameter of connected bolts,the mass of the simulated components and the impacted position are the main influencing factors for fracture of bolts.The shock response spectrum curves of some positions on the tank are higher than the lower limit and even the upper limit of military standard,which shows that the components on these positions present high probability of failure due to the damage of overloaded.
high velocity kinetic energy projectilearmored targetballistic shockfailure of bolt connectionsdamage of overloaded componentshock response spectrum
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