Research on the capability of bullet proof glass against large caliber armor piercing bullet penetration

DOI:	10.11809/bqzbgcxb2023.08.017
Keywords:	bullet proof glass; armor piercing bullet; mechanism of resistance to penetration; deviation angle; ballistic limit velocity; residual velocity
Abstract:	On the purpose of studying the penetration resistance mechanism of a bullet proof glass, this paper performs penetration experiments against this type of bullet proof glass based on 12.7 mm and 14.5 mm armor piercing bullets. ANSYS/LS DYNA software is used to numerically simulate the penetration process of the two armor piercing projectiles penetrating the bullet proof glass. By studying the influence of the armor angle on the penetration velocity at the ballistic limit of the two projectiles and the influence of the initial velocity on the residual velocity, the anti penetration mechanism of the bullet proof glass is obtained, and the armor protection coefficient is calculated. The results indicate that, when the initial velocity of the projectile is the same as the ballistic limit, the deviation angle is the largest, and it decreases with the increase of the initial velocity. The length of the hole crack of the polycarbonate (PC) backplane is proportional to the initial velocity. When the initial velocity of the projectile is the same, the residual velocity decreases with the decrease of the projectile caliber, and the difference decreases with the increase of the initial velocity. Through the engineering equations, the protection coefficient of this bullet proof glass against the 12.7 mm armor piercing projectile is 0.74.
Published:	2023-08-28
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