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In this paper, Autodyn-3D hydrocode is used to simulate the penetration process of small caliber steel projectiles into bi-layered targets with finite thicknesses consisting of silicon carbide ceramic facing tile backed by kevlar/epoxy composite plate. The numerical results of the hydrocode program are used to assess the predictions of the proposed analytical model [7]. So, the input data of the projectile and target materials to the hydrocode are coincide with that input to the analytical model [7]. These data include geometries of projectile and target as well as mechanical and physical properties of their materials such as density, modulus of elasticity, yield strength and Poisson's ratio. The main procedures used to simulate the penetration process are introduced. The obtained numerical results are compared with the predictions of the analytical model [7] due to the impact of a Fragment Simulated Projectile (FSP) having the same penetration capability as that of 7.62 mm NATO projectile [8] into ceramic/composite targets with different velocities; good agreement is generally obtained. In addition, Samples of the time histories results predicted by the hydrocode are presented with analyses and discussions. Finally, It can conclud that the Autodyn-3D hydrocode is considered as a quick tool for designing and optimizing the bi-element lightweight armour capable of defeating a projectile of certain threat.

NUMERICAL INVESTIGATION OF A HIGH-SPEED PROJECTILE PENETRATION INTO BI-LAYERED LIGHTWEIGHT TARGETS