Dynamic response of cylindrical sandwich shells with metallic foam cores under blast loading-Numerical simulations

摘要

Deformation/failure modes, blast resistance and energy absorption of metallic cylindrical sandwich shells with closed-cell aluminum foam cores were investigated in this paper. A brief of experimental result on the dynamic response of blast-loaded sandwich shells was firstly reported. Based on the experiments, corresponding finite element simulations have been undertaken by employing the LS-DYNA software. Numerical simulation results show a good agreement on the deformation/failure modes and back face-sheet center-point deflection of specimens, with those of experimental results. Results indicate that the deformation/failure, deflection response and energy absorption of sandwich shells are sensitive to the loading intensity and geometric configuration. Energy absorption capability of specimens is mono-tonically increasing and decreasing with the increase of impulse level and core relative density, respectively. However, it does not change monotonically with the face-sheet thickness of specimens. These simulation findings are worthy of the theoretical study and optimal design of metallic sandwich structures under air blast loading.