Synergistic Effects in Hybrid TPMS Lattices: Improved Energy Absorption Under Quasi-Static Compression

Lattices have attracted increasing attention for their outstanding mechanical and multifunctional properties. In this study, a novel class of hybrid lattices composed of Primitive (P) and I-Wrapped Package (W) topologies is proposed by a mathematical formula. The deformation behaviors, mechanical properties, and energy absorption characteristics of the hybrid lattices are systematically investigated using compression experiments and simulations. The results show that the hybrid lattices exhibit a localized initial failure followed by stress redistribution, effectively avoiding brittle interlayer collapse of the P-type sub-lattices and maintaining a high load-bearing capacity even after the initial failure. A synergistic enhancement effect of ‘1 + 1 > 2’ is observed, in which the hybrid lattices outperform the linear combination of their constituent sub-lattices. Compared with the total performance of the P and W sub-lattices, the hybrid lattices exhibit increases of 11.6%, 30.0%, 34.5%, and 368% in elastic modulus, yield strength, compressive strength, and energy absorption, respectively. The exceptional energy absorption capability of hybrid lattices is attributed to the synergistic deformations and stress redistribution mechanisms during the compression. The proposed hybrid lattices significantly improve energy absorption, and they have potential applications in a tunnel lamp maintenance robot.