Abstract: The deformation patterns, the carrying capacity, and the energy absorption of honeycombs filled with regular-arranged and stagger-arranged triangular cells under in-plane impact are studied by numerical simulation. The results show that the deformation bound of honeycombs is more and more close to the impact end with increase of impact velocity or decrease of cell wall thickness. The honeycomb filled with regular-arranged cells is crushed row by row to densification, while four kinds of deformation pattern are summed up for the honeycomb filled with stagger-arranged cells. Most of the absorbed energy of honeycomb is translated into internal energy, while kinetic energy has a less proportion. With increase of impact velocity, both of the two kinds of honeycomb are better in both carrying capacity and energy absorption. The proportion of internal energy decreases with increase of impact velocity, while the proportion of kinetic energy increases. The honeycombs filled with regular-arranged cells show better carrying capacity and better energy absorption than the honeycombs filled with stagger-arranged cells, which is attributed to different internal energy absorbed by them, and the difference will gradually diminish after the core region forms in the honeycomb filled with stagger-arranged cells.
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