Embedded Actuation for Shape-Adaptive Origami

Grey, Steven; Scarpa, Fabrizio; Schenk, Mark

doi:10.1115/1.4049880

Cited by 9 publications

(4 citation statements)

References 32 publications

(40 reference statements)

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“…The plasticization effect is embodied by a weakening of folding strength (Figure S9c,d, Supporting Information). [ 21 ] We used SEM imaging to further investigate the crease structure of the folded papers as a function of folding angle (θ f ) and identify the underlying microdeformation mechanism. The elastic GOPs buckled with typical chevron or box folds and delamination under flexural stress, arising from interlayer 2D confined deformation (Figure 2h, Figure S10a, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Hydroplastic Micromolding of 2D Sheets

et al. 2021

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Processing 2D sheets into desired structures with high precision is of great importance for fabrication and application of their assemblies. Solution processing of 2D sheets from dilute dispersions is a commonly used method but offers limited control over feature size precision owing to the extreme volume shrinkage. Plastic processing from the solid state is therefore a preferable approach to achieve high precision. However, plastic processing is intrinsically hampered by strong interlayer interactions of the 2D sheet solids. Here, a hydroplastic molding method to shape layered solids of 2D sheets with micrometer‐scale precision under ambient conditions is reported. The dried 2D layered solids are plasticized by intercalated solvents, affording plastic near‐solid compounds that enable local plastic deformation. Such an intercalated solvent‐induced hydroplasticity is found in a broad family of 2D materials, for example graphene, MoS2, and MXene. The hydroplastic molding enables fabrication of complex spatial structures (knurling, origami) and microimprinted tubular structures down to diameters of 390 nm with good fidelity. The method enhances the structural accuracy and enriches the structural diversity of 2D macroassemblies, thus providing a feasible strategy to tune their electrical, optical, and other functional properties.

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Section: Resultsmentioning

confidence: 99%

Hydroplastic Micromolding of 2D Sheets

et al. 2021

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“…The work in the present article considers only the uniform geometry of the origami sheets whereas the elastic properties of physical materials can favor one mode of deformation over the others ( 52 , 53 , 69 ) and imperfections can significantly alter the mechanical response ( 70 , 71 ). Moreover, local actuation typically leads to nonuniform deformations ( 72 – 74 ) and creases tend to exhibit temporal relaxation dynamics ( 75 ) that give rise to plastic memory effects ( 76 ). Thus, it remains to explore the ability to control the mechanical response of physical origami via this geometric symmetry.…”

Section: Discussionmentioning

confidence: 99%

Discrete symmetries control geometric mechanics in parallelogram-based origami

McInerney

Paulino

Rocklin

2022

Proc. Natl. Acad. Sci. U.S.A.

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Geometric compatibility constraints dictate the mechanical response of soft systems that can be utilized for the design of mechanical metamaterials such as the negative Poisson’s ratio Miura-ori origami crease pattern. Here, we develop a formalism for linear compatibility that enables explicit investigation of the interplay between geometric symmetries and functionality in origami crease patterns. We apply this formalism to a particular class of periodic crease patterns with unit cells composed of four arbitrary parallelogram faces and establish that their mechanical response is characterized by an anticommuting symmetry. In particular, we show that the modes are eigenstates of this symmetry operator and that these modes are simultaneously diagonalizable with the symmetric strain operator and the antisymmetric curvature operator. This feature reveals that the anticommuting symmetry defines an equivalence class of crease pattern geometries that possess equal and opposite in-plane and out-of-plane Poisson’s ratios. Finally, we show that such Poisson’s ratios generically change sign as the crease pattern rigidly folds between degenerate ground states and we determine subfamilies that possess strictly negative in-plane or out-of-plane Poisson’s ratios throughout all configurations.

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“…For example, a gripper based on a Miura-ori pattern is capable of maintaining its open or closed state without external load [14]; an earth-worm like robot based on a water-bomb pattern can change its diameter and length in a bistable manner [15]. It is worthing to remind that, the choice of the pattern, materials, and actuation system cannot be decoupled when designing an active-origami structure [16]. Table 1: A summary of well-known origami patterns and corresponding characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Many efforts have been made to describe this complex behavior, usually using either a finite element-based approach or a lattice framework-based approach. The former refers to a discretization of a continuous origami structure using sheet elements based on the assumption that the thickness of the folded sheet is small compared to the overall-size [28,16]. However, although accurate and capable, the finite element approach requires a high computational cost.…”

Section: Introductionmentioning

confidence: 99%

Toward actuation of Kresling pattern-based origami robots

Hu¹,

Jeannin²,

Berre³

et al. 2022

Smart Mater. Struct.

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This work investigates the technical requirement for the actuation of the bi-directional rotational motion (BRM) of engineering-material-based non-rigid origami robots. While the vast majority of previously published results have focused on paper-based origami structures driven by translation-motion, polypropylene (PP) is implemented in this research to investigate its ability to respond to engineering requirements according to BRM. Following this objective, three experiments are proposed to identify the technical performances of PP-based origami and kirigami robots based on Kresling pattern. First, the stabilization test shows that two hundred full folding cycles are required to reach a repeatable mechanical response. Second, the BRM test characterizes the various mechanical performances of both origami and kirigami structure: the polypropylene(PP)-based origami outperforms existing structures in the literature. Third, the actuation test shows that the actuation mechanical requirements can be described using three key parameters: the required torque for folding, the shape-blocking stiffness, and the bistable portion. Finally, in order to support the development of PP-based origami/kirigami robots, a `Bar and Hinge' reduced-order model is implemented for the description of the nonlinear hysteretic behavior and bistability. This method constitutes a useful tool for the design of highly nonlinear/bistable engineering structures based on PP origami and kirigami.

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Embedded Actuation for Shape-Adaptive Origami

Cited by 9 publications

References 32 publications

Hydroplastic Micromolding of 2D Sheets

Hydroplastic Micromolding of 2D Sheets

Discrete symmetries control geometric mechanics in parallelogram-based origami

Toward actuation of Kresling pattern-based origami robots

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