Effect of Filling Compressibility on the Variables of State During Projectile Penetration into a Concrete Target

The article presents the results of a numerical analysis investigating how the compressibility of a 126 mm diameter projectile affects its loading parameters in response to the g-force the projectile is subjected to as it penetrates a concrete target at an initial velocity of 1000 m/s. We performed our numerical simulation in the framework of a two-dimensional axisymmetric continuum mechanics problem, representing the filling as a compressible elastoplastic medium. We investigated three alternative filling models that have the same density under normal conditions but considerably different compressibility properties, which we describe using a barotropic Tait equation. The state variables we determined included longitudinal stresses in various regions of the filling, its rear surface velocity and axial displacement. We found that as the projectile decelerates in the concrete target, the fluctuations in these parameters are of the nature of damped oscillations, the amplitude-by-time characteristics of which depend substantially on the filling compressibility

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