Programmable soft bending actuators with auxetic metamaterials

Pan, Qi; Chen, ShiTong; Chen, FeiFei; Zhu, Xiangyang

doi:10.1007/s11431-020-1741-2

Cited by 50 publications

(25 citation statements)

References 33 publications

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“…Combining the pneumatic actuation principle with the common metamaterials design schemes would realize real-time adjustment effects. Pan et al [197] utilized a pneumatic rubber tube and metamaterials networks to make a new soft bending metamaterial. As Figure 10b shows, auxetic and non-auxetic structures, corresponding to positive Poisson's ratio and negative Poisson's ratio, were deployed on both sides of the pneumatic tube and enveloped.…”

Section: Pneumatic Actuation Active Mechanical Metamaterialsmentioning

confidence: 99%

“…The extraordinary mechanical properties of mechanical metamaterials (or structural metamaterials) derive from artificial microstructures in 3D space. Most of mechanical metamaterials are related to the basic mechanical parameters of Young's modulus E, shear modulus G, bulk modulus K, and Poisson's ratio 𝜈, Polyester plastic sheets Pneumatic actuation -16 KJ m −3 20% 40 mm Kirigami [31] Plastic sheet Pneumatic actuation 10 s -25% 32 cm Kirigami [97] Silicone rubbers Pneumatic actuation -50 KJ m −3 5% 80 mm PPR and NPR [ 197] Urethane elastomer and gelatum Pneumatic actuation -25 mJ 90% 37 mm Disk structure [ 199] Polyether ether ketone and PVC film Hydraulic actuation 0.2 s 2000 W kg −1 50% 19 cm Origami [ 208] and those parameters are used to measure the stiffness, rigidity and compressibility of the productions. When combined with stimuli-responsive materials, their functions will be further expanded.…”

Section: Functions Of Active Mechanical Metamaterialsmentioning

confidence: 99%

“…b) Deformed states of the bending metamaterial under pressures from 0 to 0.025MP. [ 197 ] Copyright 2020, Springer Nature. c) The deformation of the square lattices with alternatively arranged holes of different sizes.…”

Section: Active Mechanical Metamaterials Responsive For Various Stimulus Fieldsmentioning

confidence: 99%

“…1) The applications in smart robots include crawling robots, [ 31 , 97 , 202 , 210 , 232 , 233 , 234 , 235 , 236 ] swimming robots, [ 237 , 238 , 239 ] smart grippers, [ 125 , 201 , 212 , 240 , 241 , 242 ] smart wearable systems. [ 27 , 52 , 168 , 243 ] 2) The applications in miniaturized systems include micro actuators, [ 166 , 197 , 244 , 245 , 246 , 247 , 248 , 249 ] soft pumps, [ 250 , 251 , 252 ] artificial muscles, [ 204 , 208 , 253 , 254 , 255 ] microfluidics, [ 28 , 99 , 256 ] super‐hydrophobic surfaces, [ 257 ] smart sensors and electronic components, [ 10 , 53 , ...…”

Section: Functions and Practical Applications Of Active Mechanical Metamaterialsmentioning

confidence: 99%

mentioning

confidence: 99%

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Recent Progress in Active Mechanical Metamaterials and Construction Principles

et al. 2021

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Active mechanical metamaterials (AMMs) (or smart mechanical metamaterials) that combine the configurations of mechanical metamaterials and the active control of stimuli-responsive materials have been widely investigated in recent decades. The elaborate artificial microstructures of mechanical metamaterials and the stimulus response characteristics of smart materials both contribute to AMMs, making them achieve excellent properties beyond the conventional metamaterials. The micro and macro structures of the AMMs are designed based on structural construction principles such as, phase transition, strain mismatch, and mechanical instability. Considering the controllability and efficiency of the stimuli-responsive materials, physical fields such as, the temperature, chemicals, light, electric current, magnetic field, and pressure have been adopted as the external stimuli in practice. In this paper, the frontier works and the latest progress in AMMs from the aspects of the mechanics and materials are reviewed. The functions and engineering applications of the AMMs are also discussed. Finally, existing issues and future perspectives in this field are briefly described. This review is expected to provide the basis and inspiration for the follow-up research on AMMs.

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Section: Pneumatic Actuation Active Mechanical Metamaterialsmentioning

confidence: 99%

Section: Functions Of Active Mechanical Metamaterialsmentioning

confidence: 99%

Section: Active Mechanical Metamaterials Responsive For Various Stimulus Fieldsmentioning

confidence: 99%

Section: Functions and Practical Applications Of Active Mechanical Metamaterialsmentioning

confidence: 99%

mentioning

confidence: 99%

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Recent Progress in Active Mechanical Metamaterials and Construction Principles

et al. 2021

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Rapid Pneumatic Control of Bimodal, Hierarchical Mechanical Metamaterials

Hyatt

Harne

2022

Adv Eng Mater

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Recent attention to pneumatically pressurized mechanical metamaterials has identified opportunity for large shape change and mechanical properties adaptation through the collective exploitation of reconfigurable internal structures and enclosed cavities. Yet, many of these ideas are found to act in smooth, continuous ways at moderate rate. This research explores a new class of bimodal, hierarchical mechanical metamaterials that exemplify rapid change of mechanical behavior by exploiting pneumatic pressure as a means to cross bifurcation. A lattice structure with periodic square cavities is presented as a model metamaterial to highlight important design considerations and mechanical behavior. An analytical model is formed to delineate the multimodal boundaries in a high‐dimensional parameter space, while numerical simulations and experiments confirm the presence of each modal characteristic. The studies reveal the high rate of change afforded by this embodiment of pressurized mechanical metamaterials and confirm the origin lay in harnessing elastic instability. Extensions to the idea are compared against the Kutzbach–Grübler criteria to articulate how other metamaterial networks may be leveraged in this way. The outcomes of this research may inspire methods for high‐rate shape and properties change via multimodal mechanical metamaterial assemblies, such as for soft robotic platforms.

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Piece‐By‐Piece Shape‐Morphing: Engineering Compatible Auxetic and Non‐Auxetic Lattices to Improve Soft Robot Performance in Confined Spaces

Dikici

Jiang

et al. 2022

Adv Eng Mater

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Shape‐morphing capabilities of metamaterials can be expanded by developing approaches that enable the integration of different types of cellular structures. Herein, a rational material design process is presented that fits together auxetic (anti‐tetrachiral) and non‐auxetic (the novel nodal honeycomb) lattice structures with a shared grid of nodes to obtain desired values of Poisson's ratios and Young's moduli. Through this scheme, deformation properties can be easily set piece by piece and 3D printed in useful combinations. For example, such nodally integrated tubular lattice structures undergo worm‐like peristalsis or snake‐like undulations that result in faster speeds than the monophasic counterpart in narrow channels and in wider channels, respectively. In a certain scenario, the worm‐like hybrid metamaterial structure traverses between confined spaces that are otherwise impassable for the isotropic variant. These deformation mechanisms allow us to design shape‐morphing structures into customizable soft robot skins that have improved performance in confined spaces. The presented analytical material design approach can make metamaterials more accessible for applications not only in soft robotics but also in medical devices or consumer products.

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Programmable soft bending actuators with auxetic metamaterials

Cited by 50 publications

References 33 publications

Recent Progress in Active Mechanical Metamaterials and Construction Principles

Recent Progress in Active Mechanical Metamaterials and Construction Principles

Rapid Pneumatic Control of Bimodal, Hierarchical Mechanical Metamaterials

Piece‐By‐Piece Shape‐Morphing: Engineering Compatible Auxetic and Non‐Auxetic Lattices to Improve Soft Robot Performance in Confined Spaces

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