This paper deals with theoretical and experimental study of interaction of high-speed compact and elongated projectiles with finite thickness targets. The cases of ricochet, penetration and perforation of barriers at various speeds and angles of impact are considered. Natural heterogeneity of real materials structure plays an important role in solutions of problems in spatially three dimensional settings. The heterogeneity affects the distribution of physical and mechanical properties of structure elements, and it is one of the determining factors of structure elements destruction. Probability distributions of physical and mechanical properties within volume of the structure allow the heterogeneity to be incorporated in the equations of motion. Solid body deformations and fractures are described by the model of perfect elastic-plastic body where reaching the limit of equivalent plastic strain is a strain fracture criterion. Initial heterogeneity of materials is linked with a probability distribution of the strain fracture criterion across computational domain cells. A modified random number generator is used to produce random numbers with specified distribution.