Study Of Theory And Key Technology About Anti-Explosive Reaction Armor

In recent years, local war shows that modern armored targets such as tanks and armored vehicles are still major combat system on the ground battlefield. With the application of ERA and the development of armor protection technology, the survival of traditional anti-armor ammunition is under threat, especially with the appearance of double wedge ERA, almost all existing anti-vehicle weapons lost ability. Based on the research of ERA applied field system, this paper raised technical solution of a new separated type anti-ERA, making existing anti-armor ammunition deal with ERA reliably and lying foundation of leapfrog development of new anti-ERA.Based on comprehensive analysis of ERA at home and abroad, this paper studied movement rule, interference way and interference time of metal target board of single, double parallel and double wedge ERA systematically, and established movement model of ERA applied field. Theoretical calculation and experience verification show that, interference time of single ERA metal target board flying away from missile axis relate to the distance of relative armor plate, interference time is shortest when placing close to armor plate; the interference time of double parallel ERA is5times as much as interference time of single ERA metal target board flying away from missile axis; compared with double parallel ERA, interference time of double wedge ERA metal target board flying away from missile axis increases by38%; by selecting suitable wedge angle and armor plate oblique angle, interference time of double wedge ERA is longer, even reach to millisecond level.Based on the existing technology of series anti-ERA, combined with research result of ERA applied field, this paper raised a new anti-ERA method-separated type anti-ERA, and established theory of separated type anti-ERA. This paper also analyzed matching relationship under different working conditions such as separation distance, separation time and relatively separation velocity of separated type anti-ERA method, obtained that to make separated type anti-ERA apply on all kinds of weapons platform, separation distance should be longer than10m, separation time should be controlled within milliseconds, relatively separation velocity should be greater than150m/s. Then this paper studied two key technology of separated type anti-ERA method.Shear ring type explosion ignition rapid separating unit was invented. Using the classical interior ballistic theory and the principle of closed bomb vessel establish the theory model of rapid separation launch process. The change law of physical parameters during separation launch process was obtained by theoretical calculation and was verified by static test. At the same time, the interference of separation process on main warhead was studied. The results show that when use shear ring as storage pressure parts, the time of explosion ignition rapid separation can be controlled within milliseconds and relative separation speed is greater than150m/s. when separated type series warhead velocity is higher and its mass is bigger, the separation mass of front warhead is smaller, the rapid separation process has less influence on back warhead’s stability.Based on M. Held’s signal ERA detonation criterion, used the theories of jet penetrating spaced targets and homogeneous target and combined with numerical simulation and experiment research, detonated mechanism of68°oblique double wedge ERA was studied. The detonation equivalent judgment method of jet penetrating68°oblique double wedge ERA was established. If jet can penetrate the40mm45#steel ingot, hand-hole diameter is greater than Φ7mm, the out hole diameter is greater than04mm, the total penetration depth is greater than45mm, and the jet kinetic energy is greater than4kJ, jet can set off68°oblique double wedge ERA.The dynamic test was carried on subsystem and the whole system, and the results show that the front warhead can achieve rapid and reliable separation and after the separation, ballistic consistency was good; the front warhead can detonate reliably68°oblique double wedge ERA, the back warhead can avoid successfully interference of the applied field to breakdown main armor. The feasibility of separated anti-ERA technology is verified. It provides a valuable reference for the future application of this technology in all sorts of anti-armor weapons platform.