Analyzing the published modern approaches to the vehicles armoring shows that simulating the bulk obstacles under a ballistic impact is of scientific interest. Moreover, approaches based on the Lagrangian formulation are most often applied. The paper presents requirements for the material and the assumptions adopted in the study. They are used to develop computation models for the LS-DYNA package, describe a method for simulating obstacles using the bulk materials, and identify results of simulating the bulk obstacles in different settings under a ballistic impact using an example of the NATO ball bullet. One of the proposed method advantages in describing the sand particles is the ability to identify the particle destruction mechanisms. The paper analyzes the influence of particle size influence degree, friction coefficient and the sand material model on the striker penetration ability in the finite element simulation of a high-speed impact in the LS-DYNA package. The paper focuses major attention on forecasting the projectile deceleration with the maximum accuracy. The study results in finding that simulation based on the described method shows itself perfectly. The bullet example reflects results of the particle size, friction coefficient and sand material model influence on the striker penetrating ability when applying the described simulation method.

EDN  ZITHOZ