The normal perforation of thick metallic plate by sharp nose rigid projectile is studied in the present paper based on the general penetration resistance, which contains the terms of damping effect and the dummy mass of projectile induced by the deceleration effect. The terminal ballistic formulae with four dimensionless parameters are introduced, i.e., the impact function I, geometry function N, the damp function ξ and the dimensionless target thickness x. Theoretical predictions of perforation dependent/independent of the damping function ξ, show good agreement with the individual published test data of different projectiles and impact velocities as well as different targets.
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