A Dynamic Friction Analysis Method of Charge Survivability during Supersonic Penetration of Concrete Targets

Based on the assumption of elastic deformation of charge, a novel theoretical analysis method for charge survivability in the process of penetration is proposed by using relative displacement between projectile body and internal charge, friction work, hot spot theory, and principle of thermal dynamics. The resistance function during penetration is based upon the cavity expansion theory in the analysis. The radial stress on the projectile surface is obtained utilizing mass and momentum conservation equation and Hugoniot jump condition. In addition, the resistance forces in the supersonic penetration of concrete targets are calculated with finite difference method and Newton's Second Law. The important design parameters of charge affecting the charge survivability in the penetration are revealed from the elastic theoretical analysis, which provide a theoretical basis for the survivability design of housing explosive.