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Abstract
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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: traditional hexagonal (HS), reentrant hexagonal (RH), and star-shaped (SS) configurations. The tensile tests reveal that the hexagonal structure (HS) exhibits a positive Poisson’s ratio, contracting transversely under longitudinal stretching. In contrast, both reentrant hexagonal (RH) and star-shaped (SS) structures display auxetic behavior, expanding laterally under tension. Among the three configurations, the star-shaped structure (SS) demonstrates superior tensile resistance and the lowest stress response, indicating enhanced mechanical performance. Dynamic impact simulations further reveal that the SS structure experiences the least deformation and lowest stress response under impact loading, distributing forces more evenly compared to the other two structures. This suggests that the SS honeycomb is better suited for applications requiring high energy absorption and impact resistance. Overall, the findings indicate that the star-shaped honeycomb (SS), with its superior mechanical characteristics, is highly promising for use in 3D-printed energetic materials.
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