The structure design and application of metamaterials with negative Poisson's ratio

Open Access

Fig. 11

3D re-entrant structures. (a) 3D re-entrant hexagonal structure and its unit cell [18], (b) 3D double-arrow structure and its unit cell [19], (c) 3D STAR-shaped structure and its unit cell [55] and (d) finite element model of the data-driven 3D auxetic unit cell and lattice specimen [57].

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