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Due to the unique deformation characteristics of auxetic materials (Poisson’s ratio    μ  &lt;  0   ), they have better shock resistance and energy absorption properties than traditional materials. Inspired by the concept of variable cross-section design, a new auxetic re-entrant honeycomb structure is designed in this study. The detailed design method of re-entrant honeycomb with variable cross-section (VCRH) is provided, and five VCRH structures with the same relative density and different cross-section change rates are proposed. The in-plane impact resistance and energy absorption abilities of VCRH under constant velocity are investigated by ABAQUS/EXPLICIT. The results show that the introduction of variable cross-section design can effectively improve the impact resistance and energy absorption abilities of auxetic re-entrant honeycombs. The VCRH structure has better Young’s modulus, plateau stress, and specific energy absorption (SEA) than traditional re-entrant honeycomb (RH). The influence of microstructure parameters (such as cross-section change rate    α   ) on the dynamic impact performance of VCRH is also studied. Results show that, with the increase in impact velocity and    α   , the plateau stress and SEA of VCRH increase. A positive correlation is also found between the energy absorption efficiency, impact load uniformity and    α    under both medium and high impact speeds. These results can provide a reference for designing improved auxetic re-entrant honeycomb structures.

In-Plane Impact Dynamics Analysis of Re-Entrant Honeycomb with Variable Cross-Section