Multilayer ballistic shields for marine and land military transport structures

Armox500, naval aluminum alloy, and hull steel. Armox500 steel is used for ballistic shields for military transport (land type T and marine type S). To this end, these materials were shot with a 7.62mm caliber bullet using a ballistic pendulum (BP). Solid (1-layer) and divided (2-layer) test materials of the same thickness in the form of 50 mm diameter discs were shot with a 7.62 mm ŁPS or B caliber bullet. It was found that for hull steel, 2-layer samples of the protected material have lower ballistic resistance than 1-layer (solid) samples of the same thickness, contrary to the naval aluminum alloy. By dividing the aluminum alloy into layers, we obtain significantly better BR. Solid 7mm thick Armox500 steel is not perforated by a 7.62mmB bullet, similar to 8mm thick Al2O ceramic shot with a 7.62mm ŁPS bullet. Dividing Armox 500 reduces its protective effectiveness.MULTILAYER BALLISTIC SHIELDS FOR MARINE AND LAND MEANS OF MILITARY TRANSPORT
The paper presents the results of investigation on a ballistic resistance of Armox500 steel, aluminum alloy for shipbuilding and ship hull steel. Armox500 steel is utilized in the ballistic shields for means of military transport (land transport of type T and marine one of type S). Accordingly, the materials mentioned above were subjected to shooting with a bullet of the caliber 7,62 mm using a ballistic pendulum. Monolithic (single layer) and divided (double layer) materials of the same total thickness were in the form of disks having diameter equal 50 mm. The ŁPS bullet was used for testing the naval materials whereas the B was applied for Armox500.
It was found that the double layer ship hull steel exhibited worse ballistic resistance than the single layer sample of the same thickness. The opposite situation was discovered for aluminum alloy – dividing it into layers one obtains superior ballistic resistance.
Monolithic Armox500 steel of 7 mm thickness does not undergo perforation upon an impact of 7,62 mm B bullet. Similarly Al2O ceramic material of 8 mm thickness exhibits effective protection against 7,62 mm ŁPS bullet. Dividing Armox500 decreases its ballistic resistance. (…)