Underwater Explosion Damage Mechanisms and Protection of Double-Hull Under Shaped Charge

In order to improve the anti-shock performance of underwater target, composite materials have been widely used. A numerical model of near-field underwater explosions associated with shaped charges was developed based on the Coupled Eulerian-Lagrangian (CEL) method. The damage modes of composite Q235 steel/SiC ceramic/UHMWPE sandwich plates were compared. According to material properties, a new composite sandwich plate was proposed-Q235 steel/UHMWPE/SiC ceramic/UHMWPE composite sandwich plate. The effect of different material mass ratios on the protective effect of composite sandwich plates was analyzed. The results show that new composite sandwich plate underwater explosion impact resistance, anti-projectile performance greatly improved. The composite sandwich plate with proper mass ratio has superior resistance to shaped charge underwater explosion. Composite sandwich plate with faceboard UHMWPE 48.06 mm, SiC ceramic 14.63 mm and backboard UHMWPE 48.06 mm is the most effective. This pressure hull has the greatest decrease in head velocity of metal jet. The as above results can provide a reference for naval construction of pressure hull for underwater target.