Study on the influence of material properties and explosive quantities on the formation of Explosively Formed Projectiles (EFP)

Abstract. This paper analyzes the formation of explosively formed projectiles (EFP), a field of significant interest in technological and military research. These projectiles are employed in military and industrial applications, capable of penetrating armor due to their speed and shape. This paper presents a comparative analysis, using numerical simulation, of the formation mechanisms of explosively formed projectiles (EFP) and their effects on armor. The research focuses on varying the type of metal used for the liner, the quantity and type of explosive employed, and the geometry of the configuration, examining how these parameters influence EFP formation. By using different materials, we aim to identify correlations between their mechanical properties, physical dimensions, and the characteristics of the resulting projectile. The article addresses the topic of numerical simulation, with simulations conducted using the LS-Dyna software to validate calculations and hypotheses related to explosively formed projectiles. To reduce analysis time, given the multitude of configurations tested, an axisymmetric 2D model was formulated. Euler and Lagrange models were employed for the constituent elements of the developed model. The results were compared, leading to the establishment of an optimal EFP configuration model.