Analysis of Oblique Penetration Process of Blunt Deformable Projectile into Multilayer Metallic Targets

By using of multilayer targets instead of monolithic layer one with equal total thickness; it is possible to increase the perforation ballistic resistance. As a result, for the same perforation ballistic resistance, the total thickness of the multilayer targets would be smaller. In this paper, a new analytical model for oblique penetration of blunt projectile into the multilayer metallic target is developed using the plastic stress wave propagation theory and equation of momentum. The base of this model is Felli’s model for oblique penetration of blunt projectile into monolithic layer target. The penetration processes are defined in nine stages. The first stage is cavity expansion in the target and then penetration continues with plug formation. For each stage, equations of motion for projectile and target are derived and solved to obtain penetration parameters. The analytical results of this paper are in good agreement with experimental results of the other investigators.