Compaction Ring Analysis of Concrete Penetration Available to Purchase

The purpose of this paper is to report the results of laboratory scale penetration tests on aged fine particle concrete targets. Hardened 4340 steel (RC-50) projectiles were fabricated with ogive noses and flat ends for the purpose of the tests. The projectiles were 0.164 inches in diameter with varying lengths. The projectiles were launched from a 0.167 inch smooth bore powder gun, and the impacts were normal to the face of the target. The targets were small enough to permit two methods of measurement to find the penetration depth: direct measurement from the back of the projectile and x-rays of the target. The Compaction Ring Theory, presented earlier by Jones [1] and Nuckols[2], was then applied to the penetration depth data for the ogive-nose projectiles. Several of the equations to follow were first presented in those papers. However, two corrections were made to the theory previously presented involving the sign of the yield stress of the target in the radial stress equation and in deriving the penetration depth equation. These corrections will be described in more detail later. Since the Compaction Ring Theory in its generic form does not apply to flat-ended projectiles, it was modified to include this case. The results show reasonable correlation for target strengths that are consistent with the strain rates that are anticipated for the range of impact velocities that were used in the experiments.