Fig. 3
From: Computationally efficient design of directionally compliant metamaterials
Validation of the screw degree-of-freedom (DOF) example. a In situ nanomechanical compression experiment on a screw directionally compliant metamaterial (DCM) fabricated using two-photon lithography, during which the corners of the rigid layers were tracked (red circles) and compared with the undeformed configuration (yellow circles). b Finite element analysis (FEA) assuming fully linear behavior depicting the clockwise rotation observed in experiments. c Pitch comparison between freedom and constraint topologies (FACT) prediction and FEA (30 μm/rad), and experiments (38.3 μm/rad). d Cyclic compression of the screw-DOF DCM. The experimental data points in c and d correspond to the averaged top-layer rotation for a minimum of two identical samples, while the error bars correspond to the standard deviation amongst the samples (scale bar in a, 50 μm)
