3D Programmable Metamaterials Based on Reconfigurable Mechanism Modules

Mechanical metamaterials are of tremendous research interest due to their unconventional properties that arise from unit microstructure. Shape-reconfiguration is an effective method realize programmability on various for different tasks a structure or system, while existing researches focus multiple degree-of-freedom (DOF) systems limited configurations morph along single kinematic path. Here, starting one-DOF Wohlhart polyhedron module, its interesting topological transformation explored motion paths through bifurcations, accompanied by tunable mechanical properties, including Poisson's ratio, chirality, and stiffness. Furthermore, these modules tessellated into 3D harness reconfigurability independently program the ratios in orthogonal planes within wide range negative positive even zero ratio. This work opens up avenues design programmable based perspective bifurcation generating DOF systems, which can readily be applied shape-morphing fields, such as flexible metamaterials, morphing architectures, deployable structures.