Penetration of concrete targets with deceleration-time measurements

We conducted two sets of penetration experiments with concrete targets that had average compressive strengths of 23 and 39 MPa (3.3 and 5.7 ksi). The 76.2-mm-diameter, 530-mm-long, ogive-nose projectiles were machined from 4340 RC45 steel and designed to contain a single-channel acceleration data recorder. Thus, we recorded acceleration during launch and deceleration during penetration. An 83-mm-diameter powder gun launched the 13 kg projectiles to striking velocities between 140 and 460 m/s. Measured penetration depths and deceleration-time data were analyzed with a previously published model. In addition, we compared the results of this study with results obtained from smaller diameter projectiles and this comparison suggested a projectile diameter scale effect.