Lightweight,load-bearing,and penetration-resistant integrated meta-structures have significant po-tential in military equipment and defense facilities,as they can effectively reduce weight and improve space uti-lization compared to traditional load-bearing structures and armors.Based on hybrid sandwich meta-structures,the load-deflection curves of the meta-structure and the traditional corrugated sandwich under 3-point bending loads were compared.The protective performance and energy absorption mechanism of the meta-structure un-der multiple ballistic impacts were experimentally studied.The research results indicate that,the hybrid sand-wich meta-structure mainly experiences brittle fracture of ceramic,plastic fracture of face-sheets,and debond-ing of the adhesive layer under bending loads.Its load-bearing capacity is higher than those of traditional corru-gated sandwiches.Furthermore,the study also reveals that the impact location and the lattice core type influ-ence the multi-impact resistance of the meta-structure,with the honeycomb core demonstrating superior multi-impact resistance compared to the corrugated core.The corrugated sandwich lacks longitudinal constraints on the ceramic,while the honeycomb core provides stronger constraints on the ceramic,limiting the area of ce-ramic damage.As a result,the penetration-resistant performance remains relatively consistent as the number of impacts increases.
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