Penetration of Hypervelocity Projectile into Foamed Polystyrene

概要

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Spherical nylon projectiles 7 mm in diameter and 0.213 g in mass penetrated into foamed polystyrene targets of nominal densities of 11 kg/m^3 (L-type), 37 kg/m^3 (M-type), and 74 kg/m^3 (H-type), at velocities of up to 4.3 km/s. The hole depth takes a broad maximum around the impact velocity of approximately 3.9, 1.8 and 1.5 km/s for L-type, M-type, and H-type targets, respectively, above which the fragmentation of the projectile occurs. Using L-type targets, more than 86% of the projectile mass at the impact velocity of 3.88 km/s is recovered without fragmentation. Maximum penetration depth, maximum cross-sectional area of the hole, and the target mass removed in the penetration are given as a function of the impact velocity V_i and target density ρ_t and expressed as 〜ρ^<-1.2>_t, 〜V^<+2.2>_i, and 〜E^<+1.1> (E: Kinetic energy of the projectile), respectively. The latter relationship suggests that a constant proportion of the initial energy is expended to create the hole.
社団法人応用物理学会の論文
1990-11-20