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During the ballistic experiments, fiber-reinforced concrete panels are loaded by a high-velocity projectile. The meso-scale discrete model built in programming language C++ is used to simulate these tests. The mechanical behavior of short fibers crossing a single crack is derived and implemented. The explicit time integration scheme is under development to replace the current implicit solver utilizing the generalized-alpha method. The paper presents some partial results.

The contribution presents initial results obtained by employing a circular representative volume element (RVE) for the homogenization of a discrete model of concrete. Based on initial research, circular RVE might be a promising alternative to the classical square one (for 2D problems), especially considering its use in conjunction with periodic boundary conditions after strain localization in the material. The contribution shows the behaviour of the circular RVE in elastic loading and compares it to the results obtained by the usually used square RVE.