Extended Data Fig. 4: Geometry design of sequential metamaterials.
From: Harnessing plasticity in sequential metamaterials for ideal shock absorption
a, A metamaterial with a 4 × 4 orthogonal line-mode pattern and the represented unit cell of size 2ℓ. The ligament in the centre of the unit cell has an angle α = 45° and size t2, and the rest of the straight ligaments have size t1. b, A 3D unit cell with three orthogonal layer modes in the X, Y and Z directions and the represented components. The ligament in the centre of the components has an angle of 45° and diameter d2. The rest of the straight ligaments have diameter d1. c, A cylindrical line-mode metamaterial of radius R, thickness T and length L and the represented unit cell of size 2ℓ. There are six unit cells in the length direction and eight unit cells in the circular direction. d, A cylindrical metamaterial revolved from a 12-layer beam structure with aspect ratio t/ℓ and the represented cross-section.
