Simultaneous enhancements of energy absorption and strength driven by hexagonal close-packed lattice structures of resin revealed by in-situ compression

A burgeoning interest pervades lattice structures' lightweight yet energy-absorbent traits. Nevertheless, the solitary damage mode of conventional lattice structures impedes augmented applications. Concretely, this work centered on engineering a novel structure (a hexagonal close-packed configuration inspired by biomimicry) to transform the compressive damage mode by altering lattice arrangements. Synchronously, the effect of compression rate and relative density variations on the mechanical properties and energy absorption of the lattice structures was also probed. Additionally, modifying lattice geometries to achieve altered compression failure modes enhanced mechanical performance. Notably, strength and energy absorption increased synergistically with escalating relative density and compression rate, exceeding the capabilities of classical lattice structures fabricated from conventional structures. The present work was expected to provide researchers and engineers with new insights into the design for both mechanical properties and energy absorption.