HOLLOW-CHARGE SHELLS AND PROTECTION AGAINST CUMULATIVE AMMUNITION
Welding Department NTUU ‘KPI’
Hollow charge shells invention initiated the search for anti-cumulative protection. The operating principle of hollow charge shell is the formation of a thin cumulativejet of deformed metal which,facing thearmor interacts with it not as a solid body with a solid onebut as liquid with a liquid one. The high penetration of hollow charge shells is closely connected with this feature.
Along with the improvement of hollow charge shells the development of anti-cumulative protection took place. It should be noted that there are active and passive protections. Slat armor, which will be discussed belowbelongs to passive protection. The principle of operation of the grid is that the cumulative projectile that falls into it, is deforming with the help of grid facets, thus disrupting the shaped charge of the warhead by either crushing it, preventing optimal detonation from occurring, or by damaging the fusing mechanism.
Initially, grids from steel bands, fittings, wire, chains and other scrap materialswere used as passive protection. Practice has shown that they were not equally effective and their form, the angle to the horizontal frequency and bars compactness are very important.Firing of rectangular cells of different sizes showed that the most effective grid is with a cell size of 160х50mm. The material and the heat treatment used had the great influence on the stability of the grid. The best material for slat armor manufacturing is ultra-strong steel, but in most of the cases it has poor weldability.
We have developed a set of technical documentation and produced the first industrial design of new slat armor against cumulative projectiles. During the design and manufacturing the results of experiments on their effectiveness through firing in the field were taken into account. Currently,the workson optimization of the grids design and manufacturing processes are proceeding and testing of new designs and technological solutions are conducting as well.
1.Wikipedia (2014). High-explosive anti-tank warhead. Available: http://en.wikipedia.org/wiki/High-explosive_anti-tank_warhead. Last accessed 02nd Nov 2014.