Ballistic properties grid protective structures under high velocity impact | Mekhanika | kompozitsionnykh | materialov i konstruktsii
> Volume 14 / 2008 / Pages: 202-216

Ballistic properties grid protective structures under high velocity impact



The paper presents the results of 12 experiments to assess the ballistic resistance of shielding to high penetration rates at 2.66-3.44 km / s. It is known that this velocity interval is most dangerous for shielding and corresponds to the minimum on the dependence of the critical size of the ballistic aluminum drummer from the impact speed. However, to adequately assess the resistance presented to the penetration of protective structures, additional experiments at higher speeds. As a drummer used aluminum ball (BP-1 fusion) diameter of 6.35 mm and a weight of 0.39, the height of the different configurations of protective structures (construction base) varies in the range of 100-200 mm. The total weight of the structure per unit area (i.e., the total weight of the screens and perimeter walls) varies 10.82-15.04 kg / m2. Schemes protective structure includes two or more mesh screen, consisting of one or more steel grids with different geometric and weight characteristics. Also investigated scheme with galvanized steel mesh. To simulate wall protected in all experiments taken duralumin plate AMg 6 thickness 2.35 mm. As an indicator of shielding effectiveness adopted a simple criterion, which is the ratio of the critical diameter aluminum impactor to the total weight of the whole circuit, including the weight of the perimeter wall. Experiments have shown that the relative position of grid does not have a strong influence on her “performance”, but it is critical to their total number in the scheme and weight distribution between the screens. No differences were found between the use of zinc-coated or galvanized nets. Evaluate the reliability of a range of values ​​of the index of efficiency of protective structures for certain configurations. The results of experiments can be used to design a lightweight shielding germokorpusa spacecraft.