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Plugging of Metallic Plates under Normal Impact of Deformable Projectiles

In this paper, the plugging failure of metallic plates under normal penetration of deformable projectiles has been analyzed by considering plastic stress wave theory. The material behaviors of plate material and projectile are considered rigid- plastic linear work hardening. In this model based on propagation of plastic stress waves in projectile, plug and outer region of plug, the penetration process is divided in six steps and governing equations at each step are derived. The results of analytical model are compared with experimental results and modeling by LS-Dyna software. The residual velocity, flattening area of projectile, penetration time and ballistic limit velocity predicted by new analytical model are good agreement with experimental results.