Investigation of the glass barriers fracture under shock loads using the JH-2 model

This paper presents the results of numerical simulation of the interaction of a spherical steel projectile with a silicate glass barrier. The initial velocity of interaction is 750 m/s. The problem is solved numerically, by the finite element method, in a three-dimensional formulation within the framework of the phenomenological approach to the mechanics of solids using the author's software package EFES. To describe the processes of deformation, fracture and cracking, 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 used calculation algorithm takes into account the formation of discontinuities in the material and the fragmentation of bodies with the formation of new contact and free surfaces. The behavior of the projectile material is described by an elastoplastic medium. The limiting value of the intensity of plastic deformations is taken as a local fracture criterion for the material of the projectile. A detailed numerical analysis of the dynamics of the stress-strain state of a glass barrier and the effect of shock-wave processes on its fracture is carried out. It was found that the main role in the fracture of the barrier, with the considered kinematic and geometric parameters of interaction, is played by wave processes.