Impact effects of explosively formed projectiles on normal strength concrete

Abstract

Abstract. This paper will address the experimental results of the impact of 101.6 mm (4 in) explosively formed projectiles on normal strength concrete targets. Five projectiles were recovered using a soft recovery system to determine the average mass and nose shape of the projectiles. Velocity data for each test was measured with a high speed camera. The average projectile nose shape and mass plus the striking velocity, and the penetration depths from ten tests were compared to existing penetration equations to see if one or more of the equations is applicable for this type of projectile impact. The coarse aggregate gradation used in the concrete mix has Hugoniot data available. The Hugoniot data allows comparison of any observed spalling with the theoretical predictions.

The development and ballistic performance of protective steel-concrete composite barriers against hypervelocity impacts by explosively formed projectiles

“…The velocity of the projectiles was estimated using motion analysis of the high-speed video Table 2. These average velocities are comparable with the similar EFP design described in [7] where a velocity of 1317 m/s was determined using C-4 explosive fill. The recovered projectile has an air cavity that begins at the tail and progresses forward into the projectile, which is difficult to observe.…”

“…The EFP breached the first two concrete wall targets and had sufficient energy to topple a third wall (not shown). Bookout and Baird [7] conducted an extensive experimental program on unreinforced concrete targets of 600 mm thickness impacted by a 100 mm calibre EFP. Their experimental results demonstrate that an EFP is capable of destroying and penetrating substantial unreinforced and reinforced concrete targets.…”