The paper presents results of a computational and experimental study of the multilayer protective structure designed for armoring the transport vehicles, which contains the ceramic sand. It provides a methodology for determining parameters of the Johnson—Cook material model, and assesses efficiency of selecting the parameters by validating the open experimental data and the experiment conducted. Experimental part of the study used the FMJ 18 Paradox projectile; the shot was fired from a smoothbore gun. Numerical simulation in the LS-DYNA package made it possible to forecast the experiment and assess the effect of sand on the armor protective properties. Computation results were not refined based on the experimental results. Sand was simulated in the FEM setting using the homogeneous first-order TET elements simulated with a gap. The modified method of particle description, as well as the selected parameters of the Johnson-Cook material model made it possible to predict the striker deceleration and its effect on the sandwich panel quite accurately. Test results demonstrate the potential in using ceramics in the form of sand in the protective kits of the transport vehicles. Introduction of sand as the intermediate layer in a protective structure indicates significant increase in the ballistic resistance.

EDN  PRXYYU