Synergistic Enhancement and Optimization of Triply Periodic Minimal Surface Lattice‐Filled Thin‐Walled Tubes

To overcome the trade‐off between high specific energy absorption (SEA) and low initial peak crushing force (IPCF) in thin‐walled energy absorbers, this paper proposes and systematically investigates a class of composite structures consisting of hybrid triply periodic minimal surface (TPMS) lattices and multi‐cell thin‐walled square tubes. The synergistic enhancement mechanism between the lattice and the tube wall was revealed through quasi‐static compression experiments and finite element simulations. A theoretical mean load model was established based on folding element theory, the Gibson–Ashby relationship, and interface friction dissipation, with prediction errors below 5%. Taking the PPGG3–T3 structure as a case study, a multiobjective optimization model was developed with wall thickness, relative density, and hybrid transition position as design variables, aiming to maximize SEA and minimize IPCF. The results show that PPGG3–T3 achieves an energy absorption enhancement of 14.8%. Moderately increasing wall thickness, reducing relative density, and setting the hybrid transition at ẑ ≈ 0.3 enable a balanced SEA and IPCF while maintaining crushing force efficiency ≥0.76. The proposed model and framework provide a theoretical basis for designing high‐performance energy‐absorbing structures.