A note on the perforation of thin concrete slabs by rigid projectiles

We analyzed the perforation data from several works where thin concrete slabs were impacted by rigid long rods. The data includes the ballistic limit velocities of these projectile/slab pairs, as well as the residual velocities of the projectiles. We found that the experimental ballistic limit velocities can be accounted for by the perforation model that we published previously. On the other hand, we had to update our model to account for the residual velocities in these tests. The experimental data in these works showed that more concrete mass was ejected from the back face of these slabs than we assumed in our earlier model. Moreover, the ejected mass in these experiments was found to decrease with impact velocity. These features are in contrast with our earlier model’s assumptions, and we had to update the model as discussed here.