The Effect of Hardening Model on the Fracture of a Penetrator Impacting an Inclined Concrete Target

Generally, oblique penetration is more frequent than normal penetration when a penetrator attacks to the target. The penetrator experiences complex loading states and can be easily deformed when oblique penetration occurs on concrete target. So, it is essential to investigate and acquire the survivability of the penetrator in the design phase. In this study, structural survivability evaluation with various hardening models of the penetrator material was carried out through a precise numerical analysis of a test case. We obtained the dynamic material properties of the penetrator material (AISI4340 steel) and approximated with isotropic and kinematic hardening models to describe complex loading states during oblique penetration. In addition, dynamic fracture properties are also applied to the numerical analysis. For target material, concrete material constants in good agreement with test database were obtained. Finally, we confirmed the numerical analysis method suggested in this paper is possible to evaluate the survivability of penetrating warheads and showed the effect of material hardening model on the impact fracture.