ArticleSmall (Weinheim an der Bergstrasse, Germany)2026
Ultrahigh Stiffness and Energy Absorption Properties of Isotropic Metallic Closed Cell Microlattices.
Article in Small (Weinheim an der Bergstrasse, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
To validate leading theories on isotropic mechanical metamaterial designs, pSC-pFCC closed cell microlattices are fabricated from SS304L sheets using the LAPIS additive manufacturing technique. By removing excess material at each layer, the fully enclosed voids in the lattice design are faithfully reproduced, confirmed by micro-CT scan, without the need to introduce release holes for precursor materials. Material anisotropy caused by the layer-by-layer fabrication process is removed with a post-print heat treatment. The microlattices exhibited highly similar elastic deformation in the <100> and <110> axes, with stiffnesses at the Hashin-Shtrikman theoretical limit, as predicted previously. However, this isotropy in stress-strain response is unexpectedly extended to the plastic regime as well, even though the microlattices failed via plate buckling in <100> orientation, but by shear banding in <110>. Moreover, the microlattices also displayed remarkable specific energy absorption (15-33 J g
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