Penetration of concrete targets with ogive-nose steel rods

• Published in: International journal of impact engineering 1998-06, Vol.21 (6), p.489-497
• Main Authors: Frew, D.J., Hanchak, S.J., Green, M.L., Forrestal, M.J.
• Format: Article
• Language: English
• Subjects: Applied sciences; Buildings. Public works; Exact sciences and technology; Fundamental areas of phenomenology (including applications); geometric and material scales; Inelasticity (thermoplasticity, viscoplasticity...); ogive-nose steel rods; penetration; Physics; Solid mechanics; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; Structural and continuum mechanics; Viscoelasticity, plasticity, viscoplasticity
• ISSN: 0734-743X; 1879-3509
• DOI: 10.1016/S0734-743X(98)00008-6

We conducted depth of penetration experiments in concrete targets with 3.0 caliber-radius-head, steel rod projectiles. The concrete targets with 9.5 mm diameter limestone aggregate had a nominal unconfined compressive strength of 58.4 MPa (8.5 ksi) and density 2320 kg/m 3. To explore geometric projectile scales, we conducted two sets of experiments. Projectiles with length-to-diameter ratio of ten were machined from 4340R c 45 steel, round stock and had diameters and masses of 20.3 mm, 0.478 kg and 30.5 mm, 1.62 kg. Powder guns launched the projectiles to striking velocities between 400 and 1200 m/s. For these experiments, penetration depth increased as striking velocity increased. When depth of penetration data was divided by a length scale determined from our model, the data collapsed on a single curve. Thus, a single dimensionless penetration depth versus striking velocity prediction was in good agreement with the data at two geometric projectile scales for striking velocities between 400 and 1200 m/s. In addition, we conducted experiments with AerMet 100R c 53 steel projectiles and compared depth of penetration and post-test nose erosion data with results from the 4340R c 45 steel projectiles.