Study On Initiation Of Metal Jet Impacting Heavy Dual Explosive Reactive Armor

Explosive reactive armor is an important part of the current main battle tank armor protection system.Studying the jet impact initiation problem of the heavy dual Explosive Reactive Armor can more comprehensively understand the initiation performance of the heavy dual Explosive Reactive Armor,and the research results can also provide some reference for the development of anti-tank weapons.Based on the explosive impact initiation theory and three-term ignition growth model,the numerical simulation of jet impact initiation of the heavy dual Explosive Reactive Armor main explosive and the heavy dual Explosive Reactive Armor was carried out by using nonlinear finite element analysis software.First of all,based on the principle of clapboard test,this paper puts forward the numerical simulation research scheme of the shaped charge sensitivity of the main explosive,and verifies the feasibility of B explosive.Referring to the national military standard,the finite element model of the jet impact on the heavy dual Explosive Reactive Armor main explosive is established,and the jet impact initiation process is simulated.By adjusting the thickness of the baffle,the process of jet penetrating into the main explosive with different thickness of the baffle is analyzed.The critical thickness of the baffle and the critical initiation threshold of the jet impact are obtained.The critical thickness of the baffle is 58-60 mm,and the critical initiation threshold is 50.59mm~3·μs^-2.Secondly,the heavy dual Explosive Reactive Armor structure was simplified.Based on the research scheme of main charge,the finite element model of jet impacting the heavy dual Explosive Reactive Armor was established,and the critical initiation threshold of the double-layer reaction armor and the time interval between the jet reaching the explosive layer of the double-layer reaction armor were obtained,namely 103.24 mm~3·μs^-2 and 13.68μs.By comparing and analyzing the response of the heavy dual Explosive Reactive Armors with and without intermediate baffles to jet impact,it is found that the existence of intermediate baffles is conducive to improving the protective stability of double-layer reactive armor.By adjusting the plate spacing of the heavy dual Explosive Reactive Armor,the response law of plate spacing to the initiation of the heavy dual Explosive Reactive Armor by jet shock was obtained.Finally,the movement process of each plate after the heavy dual Explosive Reactive Armor was detonated by jet impact was analyzed.By adjusting the distance between the heavy dual Explosive Reactive Armor plates,it was found that the peak velocity of the respective surfaces and back plates of the two-layer reaction armor increased with the increase of the distance between the plates.When the thickness of each the heavy dual Explosive Reactive Armor plate and the interval of the internal two-layer reaction armor were constant,the position of the intermediate partition and the position of the two-layer reaction armor in the whole were adjusted to obtain a group of the heavy dual Explosive Reactive Armor structures with the best jet resistance in the experimental group.