Fig. 3.

Folding of cylinders ($K=0$). (A) Bistable states (+, −) of a cylinder with appropriate planar crease. Crease parameters d (distance of the osculating plane from the apex) and angle θ (from horizontal) are shown in the schematics, along with values for $d,\theta$ for the representative samples studied in this experiment. The radius of the cylinder is 25 mm. (B) Force–displacement curves for uncreased (red), crease with $\theta =6.6\mathsf{°},\hspace{0.5em}d=2.8$ mm (blue) exhibiting monostable behavior. In contrast, a creased cylinder with $\theta =12.8\mathsf{°},\hspace{0.5em}d=11.4$ mm (green) exhibits an antisymmetric behavior leading to a bistable snapped state. Snapshots from experiments and FEA simulations show different stages of deformation. A contact-slip profile is seen at higher displacements for these samples. See, additionally, Movie S2.