Investigation of the concrete barrier fracture during oblique interaction with an ogival high-strength projectile

The paper presents the results of numerical modeling of the oblique interaction of an ogival striker made of high-strength steel with a concrete barrier. The initial projectile velocity was 606 m/s. Calculations were carried out for the angles of impact (the angle between the normal to the face of the barrier and the axis of symmetry of the projectile) of 30°, 45° and 60°. The problem is solved by the finite element method, in a three-dimensional formulation within the framework of the phenomenological approach to the mechanics of a deformable solid using the author's software package EFES. The behavior of the projectile material is described by an elastoplastic medium. To describe the processes of deformation, fracture and cracking in concrete the JH-2 model was used, which makes it possible to take into account the large deformations, high strain rates and high pressures that occur in the material. The dependence of concrete strength on strain rate has been added to the fracture model. The used calculation algorithm takes into account the formation of discontinuities in the material and the fragmentation of bodies with the formation of new free surfaces. The influence of the angle of interaction on the development of fracture in the barrier is investigated.