MuA-Ori: Multimodal Actuated Origami

Sequential snapping and pathways in a mechanical metamaterial

“…[30][31][32] We then leverage the hysteretic snapping of beams between left-and right buckled states to locally replace slender elements of the metamaterial by hybrid pusher-beam elements. [13][14][15][16][17]27,33 We show that tuning their design parameters allows us to access qualitatively different pathways. Moreover, we use gradients in the boundary conditions to independently tune the effective switching fields of the hysterons, thus obtaining multiple pathways from a single sample.…”

“…Hysteretic elements commonly occur in complex materials and play a key role in the understanding of memory effects. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Intuitively, when cyclically driving a complex system, one imagines these elements to undergo sequences of flipping transitions associated with hopping between metastable states. To understand these sequences, it is often possible to model these elements as hysterons: hysteretic elements that flip their internal state s from "0" to "1" when the local driving exceeds the upper switching field ε + and that flip from "1" to "0" when the driving falls below the lower switching field ε − [Fig.…”

“…10,11,[21][22][23][24][25] Here, we propose instead to leverage the design freedom of mechanical metamaterials to embed hysterons into a flexible metamaterial. [13][14][15][16][17]26,27 This allows us to control and tune their switching fields and to directly observe the sequences of hysteron flippings that constitute the deformation pathways and yield the t-graph. Developing such metamaterial platforms is an important step toward achieving materials with deformation pathways on demand, 28,29 with targeted memory properties and specific responses to cyclical driving, and with advanced pathways that include elementary computations.…”

Deployable mechanical metamaterials with multistep programmable transformation

“…Multimodal transformation materials have also been obtained using rational design of structural geometry (10,39) or combinatorial design (40,41). In addition, deformations with multiple transformations can be realized by imposing different actuations and excitations, as in certain cases of magnetic (7,42,43), pneumatic (44), thermal (45), and mechanical actuation (46)(47)(48).…”

“…To fill the need for a metamaterial capable of multistep transformation in a high-dimensional deformation space (39,49) and of programmable, reversible, and stable reconfiguration (7,44,50), we developed a kirigami-based design framework based on BSF elements (27,51) and applied it to build metamaterials. Initially, in the form of 1D or 2D flat structures, these metamaterials can be programmed to self-fold sequentially to generate multiple modes of transformation.…”