Abstract：In this paper, numerical simulations are carried out to study the dynamic response of the single-layer empty thin-wall spherical shell, single-layer liquid-filled thin-wall spherical shell and double -layer liquid-filled thin-wall spherical shell under impact loading. These are subjected to impact loading under a drop hammer then the modes and features of deformation are obtained in all the cases. Numerical simulation is carried out by ANSYS and LS-DYNA then deformation and energy absorption of three kinds of spherical shell are obtained. Numerical results show that inward dimpling region of single empty spherical shell is according with mirror reflection under impact loading; Due to effect of the internal liquid, for liquid-filled spherical shell the edge of its inward dimpling region appears larger transition zone and the inward dimpling of liquid-filled spherical shell is according with mirror reflection. If the impact energy is sufficient, the edge of inward dimpling will be ironed by the hammer. Although single-layer empty thin-wall spherical shell has better capability of energy absorption, the vertex displacement of it is larger, so that the effective protection space decreases in it. Double-layer liquid-filled thin-wall spherical shell can absorb most of impact energy with smaller vertex displacement, due to this it can provide satisfying protection in it. Energy absorption and deformation of single-layer thin-wall spherical shell is similar with double-layer liquid-filled thin spherical shell.
2014, Vol. 33 
