Penetration Behaviours of Open-cell and Closed-cell Aluminium Foams under Impact by Ogival-nosed Projectile

摘要

The mechanical behaviours of open-cell and closedcell aluminium foams against ogival-nosed projectile penetration are studied theoretically. Based on dynamic cavity expansion theory and previous experiment data, an analytical model for the final penetration depth is presented. The effects of the mass density of target material, the geometry and initial velocity of the projectiles on the final penetration depth are investigated. It is shown that the final penetration depth mostly depends on the density of aluminium foams and the kinetic energy of projectile. When the density of target is smaller, the final penetration depth of projectile in the closed-cell aluminium foams target is obviously smaller than that in the open-cell aluminium foams target. Meanwhile, with the increase of density of target and the decrease of initial impact velocity, the difference of the capacity of absorbing energy between open-cell and closed-cell aluminium foams targets becomes small gradually.