Analysis of ballistic resistance of composites based on EN AC-44200 aluminum alloy reinforced with Al2O3 particles

The work presents the research conducted on the impact resistance of newly developed metal-ceramic composites with aluminum matrix on firing with 5.56 × 45 mm caliber intermediate ammunition. For this purpose, materials based on AC-44200 alloy reinforced with Al2O3 particles were made using the squeeze casting method. The ballistic resistance was compared between the shot composites with 20% vol. and 40% vol. of Al2O3 particles and the shot material of the non-reinforced matrix. The ABAQUS program was used to carry out the preliminary analysis of ballistic resistance of the composites. The performed works also included homogenization through the Representative Volume Element (RVE), the 3D geometry of the 5.56 mm SS109 projectile and the simulations in the scope of shooting through materials. In the basic research, the shot samples of composite materials were subjected to the thorough metallographic analysis with the explanation of the mechanism of scrap formation while being shot. As a result of the tests and analyzes, conclusions were drawn on the application possibilities of aluminum composites reinforced with Al2O3 particles in construction of add-on-armor protection structures.