| Reactive material fragment is a kind of novel lethality element, which has the compositive properties between metal penetration and energetic material shock initiation. When suffering the intensive dynamic load that produced by high velocity penetration, reactive material fragments show the significantly enhanced structural damage capacity by the combined effects of kinetic penetration and chemical energy.This master dissertation concentrates on the damage effect of reactive material fragments impacting double-spaced structure plates. A preliminary regulation of the influence of interaction between fragments and plates on reaction rate is obtained by means of analyzing the penetration process and behavior of reactive material fragments impacting double-spaced plates, and an analytical model of the penetration-induced initiation damage is developed. The stress distribution characteristics when reactive material fragment penetrates the front plate are simulated by using AUTODYN-3D nonlinear dynamic analysis code, and a preliminary regulation of the influence factors such as fragment shape, length/diameter ratio and impact velocity, etc. on reaction rate of reactive material is obtained by comparing with penetration-induced initiation threshold stress. The influence of impact velocity and front plate’s thickness on penetration-induced initiation process and terminal damage is simulated by introducing the reactive material impact-induced initiation model of powder-burn, and comparing the damage effect with the metal fragments penetration. The ballistic impact experiment of reactive material fragment impacting double-spaced structure plates is carried out, and the influence of impact velocity and front plate’s thickness on the damage effect of rear plate is obtained, proving the effectiveness of theoretical analysis and numerical simulation method. |
