Abstract
In this paper, the mechanical behaviour of closed cell aluminium foams against truncated cone nosed projectile penetration is studied theoretically. An analytical model based on dynamic cavity expansion theory and previous experiment data is presented. The analytical equations are derived for the penetration resistance and the velocity during the whole penetrating process. The effects of the mass density of target material, the geometry and initial velocity of the projectiles on the final penetration depth are investigated in detail. It is shown that the final penetration depth mostly lies on the density of aluminium foams and the kinetic energy of projectiles. On the basis of the model, instantaneous state of the projectiles can be predicted.
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