On the friction effects on rigid-body penetration in concrete and aluminium-alloy targets

The friction on the projectile shank is usually excluded in the penetration analysis due to the difficulties to measure the pressure and frictional coefficient. In this article, the frictional force on projectile shank is discussed indirectly through the comparison between experimental data and empirical/analytical formulas of the penetration depth for both concrete and aluminium-alloy targets. It is found that the effect of the frictional force along the projectile shank can be further discussed by the afore comparison and discussion and cannot be ignored because of the relatively large effecting area, especially for deep penetration of concrete and aluminium-alloy targets, where the friction will account for more proportion of penetration resistance.