Investigation of Hexagonal Honeycomb Topology for Impact Optimization in Energetic Material

The regulation of the mechanical properties of energetic materials manufactured by traditional processes is constrained. However, the introduction of lattice structures can facilitate the regulation of mechanical properties without necessitating alterations to the materials themselves. Using finite element analysis and experimental validation, this paper investigates the behavior of these structures based on 3D printed energy‐containing materials: hexagonal structure (HS), reentrant hexagonal structure (RH), and star‐shaped structure (SS). The tensile tests reveal that the HS exhibits a positive Poisson's ratio, contracting transversely under longitudinal stretching. In contrast, both the RH and the SS display auxetic behavior, expanding laterally under tension. Among the three structures, the SS demonstrates superior tensile resistance and the lowest stress response, and the internal stress response of the SS is lower than that of the RH, with a maximum reduction of approximately 48.1%. Dynamic impact simulations further reveal that the SS experiences the least deformation and lowest stress response under impact loading. When the cell size reaches 5 mm, the peak oscillation values of the SS decrease by 18.4% and 15.5% compared to the HS and RH values. This suggests that the SS is better suited for applications requiring high energy absorption and impact resistance. Overall, the findings indicate that the SS, with its superior mechanical characteristics, is highly promising for use in 3D‐printed energetic materials.