Fig. 2: Buckling upon inflation in the SPoNGe metamaterial.
From: Soft porous metamaterials using inflation-induced buckling for smart actuation
Experimental (solid line) and numerical (solid line with markers) pressure-volume curves together with the analytical buckling pressure prediction (dashed line) for three samples: a two-lobe diamond deformed shape, b two-lobe alternating ellipse deformed shape, and c three-lobe mode shape. In each subplot, the top left image represents the deformed physical sample and the top right image the corresponding finite element simulation, for a ΔV/V0 = 0.36, b ΔV/V0 = 0.44, c ΔV/V0 = 0.43, respectively. Where ∣u∣ is the magnitude of the displacement within each element and V represents the volume of air within the SPoNGe sample. Here, the nondimensional form ΔV/V0 is presented to represent the change in volume relative to the sample’s initial volume.
