Compression Behavior of Strut‐Based IWP Lattice Structures

Triply periodic minimal surface (TPMS) lattice structures have attracted growing attention in diverse industries owing to their exceptional mechanical properties and energy absorption capacity. This study adopts an integrated analytical–numerical–experimental approach to systematically explore the mechanical performance, energy absorption behavior, and deformation characteristics of strut‐based I‐graph‐wrapped package (IWP, alternatively denoted as I‐WP) lattices under uniaxial quasistatic compression. The novelty of this work lies in establishing analytical correlations between key mechanical properties (initial stiffness, plastic collapse strength, and Poisson's ratio) and geometric as well as base material parameters. Multiscale analyses were conducted to clarify the influences of unit cell size and relative density on mechanical properties. Lattice samples with different relative densities and unit cell sizes were fabricated via selective laser melting (SLM) and subjected to quasistatic compression tests. Results indicate that relative density governs the macroscopic deformation mode and energy absorption capacity, with mechanical properties exhibiting an inverse proportionality to unit cell size and direct proportionality to relative density. Notably, the Timoshenko beam model enables accurate prediction of the lattice behavior, showing good consistency with experimental results. This study offers valuable guidelines for the design and optimization of strut‐based IWP lattice structures in advanced engineering scenarios.