Shock wave overpressure distribution behaviour in free-field by reactive filling piercing projectile penetrating multi-layered plates

The experiment of reactive filling piercing projectile (RFPP) penetrating the multi-layered structural plates is conducted to investigate the impact-induced initiation model and behind-plate deflagration shock wave overpressure mechanism is developed according to the explosion similarity principle and the one-dimensional stress wave propagation theory. The concept of effective deflagration point is proposed to reveal the propagating mechanism of deflagration shock wave. The results demonstrate that at the impact velocity of 688 m/s, the position of initiated reactive filling deflagrated behind the plates range from 0375 to 0.05192m. A significant multi-peak characteristic is presented in the relationship between behind-plate overpressure and time, as a result of the sequential impact behaviour of RFPP impacting the multi-layered plates, with the later overpressure peak exceeding the initial one.