Porous triply periodic minimal surface (TPMS) structures exhibit great potential for impact resistance applications. However, current research faces two main challenges. First, the design flexibility of single-sheet TPMS structures is limited, primarily affecting the core pore regions. Second, the influence of material properties on performance optimization has not been fully explored. This study introduces a hierarchical hybrid-embedding approach for two-sheet TPMS structures, embedding IWP substructures with customized relative densities into both the sandwich and core pores of a two-sheet P surface. We analyze the effects of material properties, specifically photosensitive resin, 316L stainless steel, and aluminum alloy, on structural performance. Experimental results reveal a clear correlation between material characteristics and energy absorption mechanisms. The two-sheet embedded TPMS structures made from brittle materials, such as photosensitive resin and aluminum alloy, show significantly improved energy dissipation through fracture-induced deformation. Specifically, photosensitive resin exhibits a 700% increase in yield stress and a 1326% improvement in energy absorption, while aluminum alloy shows a 28.4% and 87.9% improvement, respectively. In contrast, 316L stainless steel, which relies on plastic deformation for energy dissipation, shows only modest improvements of 13.4% in yield stress and 3.2% in energy absorption. These findings not only demonstrate the enhanced impact resistance of the two-sheet embedded TPMS design but also highlight the critical role of material properties in optimizing topological structures. This research provides valuable insights for impact-resistant structural design, with practical applications in aerospace, civil infrastructure, and advanced manufacturing.
Liu et al. (Wed,) studied this question.