Shock Response Behavior of PTFE/Al Reactive Fragment Impacting Three-layer Spaced Target

In order to study the shock response behavior of PTFE/Al fragments under multiple impacts, experiments of reactive fragment impacting three-layer spaced aluminum target were carried out and simulated by a numerical method including custom state equation. The spatial and temporal distribution of impact ignition and reaction behavior and damage effect of reactive fragment were quantitatively analyzed. Results show that reaction and spatial distribution of reactive fragment in numerical simulation is in good agreement with experimental results. The temporal distribution of reactive fragment reaction has great influence on the damage effect of the middle plate. When the middle plate thickness is 3 mm, reaction of reactive fragments mainly occurs in front of the middle plate. Perforation area and uplift range of the target increase with the increase of the impact velocity, and uplift range is much larger than perforation area. When the middle late thickness is 1.5mm and the impact velocity is less than or equal to 1100 m/s, reaction of reactive fragments mainly occurs behind the middle plate. As the impact velocity increasing to 1300 m/s, main reaction position of reactive fragment is transferred to the front of the middle plate. With the increase of impact velocity, perforation area of middle plate increases first and then decreases, and uplift range increases continuously-新版1.