Sintering-based lithography metal additive manufacturing of chiral mechanical metamaterials with a twist

Procedia CIRP Pub Date : 2025-01-01 DOI:10.1016/j.procir.2025.01.018

Ruslan Melentiev , Ahmed Wagih , Bram van der Heijden , Gilles Lubineau , Carlos A. Grande

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Abstract

Metamaterials are a class of materials with extraordinary capabilities derived from their engineered structure. In 2017, Frenzel et al. (Science 358, 2017) conceptualized “three-dimensional mechanical metamaterials with a twist,” which convert linear deformation into rotational motion—a mechanical response that surpasses the bounds of Cauchy continuum mechanics. However, the lack of suitable manufacturing technologies for producing metallic twist metamaterials has precluded their experimental validation and potential applications to date. Herein, 316L-stainless-steel twist metamaterials are fabricated at various scales using an emerging sintering-based technology—lithography metal manufacturing (LMM) —and their mechanical responses are tested using stereo digital image correlation. Results provide the first empirical evidence of compression-induced rotation in steel twist metamaterials and highlight their sensitivity to manufacturing defects.

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