 The study examined three types of concave hexagonal honeycomb structures with varying geometric properties. It found that the structures underwent two distinct phases when subjected to low-velocity impact. First, the cells formed a concave hexagon shape, then, as the velocity increased, the joints and center of the cells formed a glued-together structure. This resulted in the disappearance of the second phase, which had been present in the lower velocity impact. The study also investigated how various structural parameters affected the energy absorbed by these structures during low-impact events. This article was authored by Guan Xiaoxiao, Tao Fu, and Jiaxingli.