弾丸による板ガラスの破壊について(<特集>破壊力学)

概要

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On crime scenes, plate glass is frequently shot by bullets. The fracture of plate glass by a pachinko ball (steel ball) impact also occurs. Experiments were carried out to obtain basic data for estimating the impact velocities of projectiles from the morphology of the fracture. Projectiles {11mm dia. steel balls and 0.38 inch (9mm dia.) lead bullets} were shot onto ordinary glass plates firmly held around a circular periphery. It was assumed that projectile kinetic energy would all be converted into surface energy of fractured glass. The relationship between crack area A_f and kinetic energy of projectiles was investigated. A strong experimental correlation was found between A_f and the change in kinetic energy. A unique relationship was obtained between crack area and energy consumed during fracture regardless of the projectile material (steel and lead).
社団法人日本材料学会の論文
1998-08-15