Numerical simulation on frictional ignition of charge during projectile penetration

To study the charge safety during projectile penetrating process, split-step numerical simulation method was applied. The projectile penetration process was calculated first and then the responses of charge in the projectile were calculated. The methods of loading resistance on the surface of projectile, the coupled thermo-mechanical-chemical algorithm, and temperature rise mechanism induced by friction were used to simulate the responses of charge. The obtained critical striking velocity of projectile was consistent with the reported experimental results. The results suggest that the friction between projectile and charge is the key factor in the temperature rise of charge, and the ignition location of charge is close to the middle of charge. This study provides the theoretical evidence for the structural design of charge. The presented methods of loading resistance and coupled thermo-mechanical-chemical algorithm of charge during the projectile penetration would provide technique support for simulating responses of charge and system safety.