Abstract: The BPM2D (Beam-Particle Model in Two Dimensions) isused to simulate the penetration and perforation of a plain concretepanel. The BPM2D is based on the DEM and the FEM. Threetypes of beam in the BPM2D are used in the numerical model ofconcrete, with their mechanical properties varying with theirstrain-rate and are randomly assigned according to Weibull distribution toreflect the initial heterogeneity of concrete at the mesoscale level. Thefailure process of a steel bullet perforating into a concrete panel isanalyzed by this model. The velocity fieldin concrete and bullet at different impact velocities are obtained. The comparison of thesimulated results with the experimental data and the simulated results ofthe code LS-DYNA3D shows that the BPM2D can be used to simulate thedynamic failure problems of brittle material.