Design dual plateau stresses wire-intertwined lattice structures with high specific energy absorption and low load fluctuation

Lattice structures are known for their excellent mechanical properties and high design flexibility. In this study, the authors propose three types of wire-intertwined lattice unit cells - BCC, Octahedron, and OctahedronZ - fabricated entirely through steel wire winding, and various types of lattice structures constructed by combining these unit cells in different configurations. Finite element simulations were conducted to investigate the deformation modes, energy absorption capacity, and specific energy absorption (SEA) of the resulting structures. The results show that the BCC-OctahedronZ-X lattice, which combines the weakest and strongest unit cells, achieves the highest SEA, showing a 28.6% improvement over homogeneous lattices. Furthermore, based on the BCC-OctahedronZ-X configuration, the authors developed an enhanced X-patterned lattice structure that reduces the load fluctuation coefficient by 62.73% and exhibits excellent energy absorption, making it highly suitable for energy-buffering applications. This study highlights the significant potential of lattice structure design in enhancing mechanical performance.