Investigation on dynamic response of liquid-filled concave cell structures subject to the penetration of high-speed projectiles

Abstract

The objective of this paper is to study the dynamic response of a concave cell structure filled with liquid under the high-speed projectile penetration. Ballistic impact tests were conducted onto the cuboid and concave cells together with the corresponding numerical simulations. The strain gauges were posted onto the typical position to measure the dynamic response of the cell walls. The pressure load on the cell wall was also obtained. The deformation of the post-impact structure was measured using the 3D scanner. The dynamic response of the liquid-filled cell structure and the effects of the structure form were analyzed considering the maximum deformation curve, pressure waves and strain of the cell walls. The results show that the concave cell tends to expand and deform easily compared with the cuboid cell, mitigating the extrusion effects of the liquid. The cavitation pressure load induces the cell expanding deformation and failure. The specific impulse of the cavitation pressure load on the walls, the strain slope, and the maximum strain value are lower for the concave cell.