Ballistic Resistance of Aluminium Foam by Ogive-Nosed and Conical-Nosed Projectiles Impact

摘要

The paper investigates oblique penetration and perforation of low density aluminium foam with ogive-nosed and conical-nosed projectiles. Based on dynamic spherical cavity-expansion approximation, the simplified analytical penetration model has been reformulated to calculate ballistic penetration resistance of aluminium foam. In oblique penetration and perforation process, the axial and lateral force, and rotative moment of the projectile can be calculated accurately; the variation of velocity, deceleration and energy dissipation can be obtained. Ballistic trajectory and attitude of the projectile are the more important parameters to describe its motion state; ballistic trajectories of the nose and rear depict the effects of angle of incidence, angle of attack and initial strike velocity. This paper provides an analytical method which can obtain accurate and fast calculations of oblique penetration and perforation.