Influence of positive gradient metallic cellular core on energy dissipation of sandwich panels under indentation

The positive gradient (PG) metallic cellular core and its initial plateau stress linearly increase from the upper face of the metallic cellular material to its bottom face. In the current study, the discussions are carried out into the influence of PG metallic cellular core on the energy dissipation of sandwich panels under indentation. An analytical model to investigate the plastic indentation response for the sandwich panel with PG metallic cellular core is developed. Finite element simulation is carried out in order to verify the analytical results. Then, the effect of the PG metallic cellular core on the energy dissipation of sandwich panels is further investigated by considering three gradient cases. And the results show that the energy dissipation of PG metallic cellular core is lower than that of the homogeneous core with equivalent mass.