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In the present work, the ballistic performance of monolithic, in-contact and spaced type layered configurations of aluminium 1100 plates impacted by hemispherical-nosed projectiles was investigated. Numerical simulations were carried out to study the failure modes and ballistic performance of Al 1100 targets subjected to normal and oblique impact (0,15 and 30) of hemispherical-nosed projectiles. The explicit Autodyn FEM code was employed to carry out the numerical simulations. A study has been undertaken to assess the effect of element size and its aspect ratio in numerical simulations. The ballistic performance of monolithic target was found to be better at higher velocities than in-contact type target plates. The ballistic resistance of spaced type targets was observed to be less due to small contact force between layers. The reduction of spacing from 5mm to 1mm between the layers improved the ballistic resistance substantially due to large interaction force. It was concluded that obliquity effect in this study had significant influence on the response of target. At each angle of impact the ballistic resistance of monolithic target was found slightly better than that of other configurations.The variation in the deformation of target plates with radial distance from the center of the plate is also presented. At each radial distance of from the center of the plate for in-contact target plates, the deformation of target was found to be higher as compared to spaced target plates.

Numerical studies on perforation of multi-layered targets by hemispherical-nosed projectiles