Evolution of the ballistic threat has taken place, principally, in the contexts of general war, terrorism and crime. The threat has been developed to cause injury or damage to personal, land vehicles, ships, aircraft and structures. Inert projectiles will cause only localized damage to structural targets and therefore normally constitute a less potent threat to the survival of the structure than rounds which have high explosive contents. This paper describes the spectrum of ballistic threats on armoured structures. The results from FEM simulations of steel projectile penetrating sandwich honeycomb armours are discussed. The simulations are performed in 3D AUTODYN software [1]. Finally, the armours with composite systems and different materials subjected to blast loads will be discussed. The results show that the ceramic-faced armours cause reduction in projectile exit velocity by about 29.4 % and 39.6% for ceramic thicknesses 10 mm and 20 mm respectively. Also the result indicate that the honeycomb reduce the displacement due to blast loads by about 77.24%, only with 3.586 % increasing in the total weight of the armours.

Sandwich panels give an optimum and proven tools to handle problems related to design and analysis of the structures subjected to blast load. The present work focuses on estimating the relative density of steel honeycomb sandwich panels. These panels can be applied on defense works, homeland security, banks and civilian industries intended to minimize the effects of accidental explosions. Sandwich constructions with metallic hexagonal honeycomb core are utilized in this paper due to its high specific strength and stiffness relative to its weight. Estimating the relative density of the metallic hexagonal honeycomb core based on single degree of freedom and the scaling dimensional and considering the dynamic factor contrived under transient dynamic loads resulted from detonating any amount of TNT at any stand-off distance. The strength and stiffness of simply support honeycomb core panels were evaluated based on boundary condition of strength and deformation. The proposed approach suggested controlling the safety design for those panels.