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Calculation of the Velocity and Shape of an Explosively Formed Projectile (EFP) Using Axisymmetric ALE

The symmetry common to most explosively formed projectiles (EFPs) permits their characterization using 2D axisymmetric analysis. Formation of an EFP entails volumetric expansion of the explosive and extensive plastic flow of the metal plate, both of which can be calculated using an Arbitrary Lagrangian Eulerian (ALE) method. Accordingly, the 2D axisymmetric ALE capability in LS-DYNA® was applied to calculate the velocity and shape of an EFP. The methodology was validated against EFP velocity and shape measurements published in SAND-92-1879 by Hertel.