Professor Ke Liu and his collaborators (Prof. P. Pratapa and Prof. G. H. Paulino) proposed a new four-vertex origami unit cell, named Morph, that can morph continuously between a Miura mode and an Eggbox mode. By changing the mountain/valley assignment of one of the creases, the unit cell's Poisson's ratio smoothly transitions over a wide range of negative to positive values. The metamaterial, composed of a tessellation of these unit cells, can be programmed into numerous hybrid configurations that allow for mode-locking and tunable switching of Poisson's ratio.

The work was published in Physical Review Letters on April 19, 2019.

• View Full Text (PDF)

• View Supporting Information (PDF)