Impact Resistance of Design Composed of Ice Block and Thin Metal Plate Impacted by High-Velocity Ogival Projectile

The paper presents the results of numerical studies of ice fracturing upon impact with a high-speed projectile. The objects of study were single-layer and two-layer ice targets containing a thin steel plate in different places (front, rear, middle parts of the target). The ice was modeled as a single-phase, elastic-plastic, porous, strong medium, taking into account shock-wave phenomena and the joint formation of spalling and shear fractures. As the main research tool, the method of G.R. Johnson, the computational part of which is supplemented by algorithm for splitting nodes and erosion of triangle elements was used. The results of numerical simulation are compared with well-known analytical and experimental data. The mesh sensitivity analysis was made for validation of numerical results. It was found that in all cases, the ice was crushed into fragments, and the steel plate was successfully perforated, despite its location into the structure. On the graph of the time dependence of the projectile’s velocity, the areas of the plate penetration and the exit of the projectile from the structure are marked. The most promising sample has been identified in terms of creating protective structures composing ice and a thin metal plate.