Dynamic Compression Response and Optimization of Biphasic Stretching‐Bending Synergistic Lattices

Lattice materials exhibit excellent impact‐resistance properties, which are advanced multifunctional materials with great design potential. In this study, by introducing the two‐phase strengthening mechanism of composite materials, the biphasic stretching‐bending synergistic lattices (BSBSLs), which contain matrix phase cells and enhanced phase backbone cells, are constructed, and their dynamic compression response and energy absorption characteristics are investigated by numerical simulation. Additionally, the effect of the height and density distribution of cells on energy absorption (EA) is analyzed. Finally, to further improve the performance of specific energy absorption (SEA), optimization models of uniform and hierarchical BSBSLs are established. The results indicate that, at the same relative density, compared with stretching‐bending synergistic lattices (SBSLs), the specific strength and SEA of BSBSLs have increased by 49.7% and 57.59% respectively. Compared with the initial structure, for uniform BSBSLs, when the overall relative density remains unchanged and varies from 10% to 70%, the SEA of the optimal structure has increased by 288% and 373% respectively; for hierarchical BSBSLs, when the relative density varies from 10% to 70%, the SEA of the optimal structure has increased by 404%. This research provides a reference for the design of dynamic compression response and optimization design of multilayer lattice structures.