Fig. 3: Metamaterial performances.
From: Large recoverable elastic energy in chiral metamaterials via twist buckling
εlimit denotes the global strain at material strength (σv). Performances of octahedron and prism lattices are controlled by the oblique angle (θ) of the rod, whose εlimit increases as θ decreases. For chiral metamaterials, h0 = 30 mm and radius (R) is variable. a–e, Rod-based metamaterials. a, Legend and deformation modes for metamaterial configurations in b–e. b, Ashby map of E/Es versus ρ/ρs. c, Bearing strength σbk = max(σeq) on the buckling plateau versus εlimit for σv = 0.2Es. d, Enthalpy (ϕ/ϕs) versus εlimit for σv = 0.1Es. e, ϕ/ϕs ~ εlimit for σv = 0.2Es. f–h, Plate- and beam-based metamaterials, in which the plate and square beam have the thickness t = 1 and length L0 = 30 mm. Max(σv) occurs at the corner edge of the twisted beam. f, Legend and deformation modes for configurations in g and h. g,h, σbk (g) and ϕ/ϕs (h) versus εlimit for σv = 0.09Es. Inset in g: an E–ρ map.
