Ballistic properties of multilayered concrete shields

We investigate theoretically the effect of layering of concrete shields using a wide class of semi-empirical models. We have found that (i) the ballistic limit velocity (BLV) of the multilayered shield does not depend on the order of the plates in the shield, (ii) monolithic shield is superior to any layered shield with the same thickness, and (iii) the largest decrease of the BLV occurs when a shield is divided into a number of plates having the same thickness.