Bi‐Shell Valve for Fast Actuation of Soft Pneumatic Actuators via Shell Snapping Interaction (Adv. Sci. 15/2021)

Qiao, Chuan; Liu, Lu; Pasini, Damiano

doi:10.1002/advs.202170092

Cited by 4 publications

(9 citation statements)

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“…To experimentally evaluate the programming of the energy dissipation by instability forces and compare it with the existing approaches (increasing snap‐back induced energy release by decreasing stiffness of snapping parts [ 16,17 ] ), a series of experimental tests has been designed (Figure 3). We 3D print one solid column (cell#1) and six alternative cells (cell#2 to #7) with different hinged inclined beams to achieve dissimilar instability forces and stiffnesses.…”

Section: Resultsmentioning

confidence: 99%

“…Having two bistable cells with

F_{{\rm{max}}}^1 &lt; F_{{\rm{max}}}^2

in series,

F_{{\rm{min}}}^1 &lt; F_{{\rm{min}}}^2

and

F_{{\rm{min}}}^1 &gt; F_{{\rm{min}}}^2

result in three (Figure 2b4) and four (Figure 2c8) stable states, respectively. [ 16,17 ] The theory is evaluated by a set of experiments on a chain with two unit cells ( Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…d) The experimental results and comparison with the theoretical predictions for the chains shown in (b). [ 16,17 ]…”

Section: Resultsmentioning

confidence: 99%

“…Elastic released energy and shape‐reconfigurability have been the subject of recent studies. [ 15–17 ] However, two challenges are yet to be addressed: first, programming the released energy by controlling the instability forces; and second, predicting and controlling the deformation sequences to leverage all attainable configurations of a material/structure by applying stimuli merely at a single point on its exterior boundary. In addition, metamaterials are commonly topologically designed in the pre‐fabrication stage to deliver properties beyond what is found in naturally occurring materials (e.g., negative incremental stiffness, [ 18 ] Poisson's ratio, [ 19 ] compressibility, [ 20 ] and electromagnetic permittivity [ 21 ] ).…”

Section: Introductionmentioning

confidence: 99%

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Programming Multistable Metamaterials to Discover Latent Functionalities

et al. 2022

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Using multistable mechanical metamaterials to develop deployable structures, electrical devices, and mechanical memories raises two unanswered questions. First, can mechanical instability be programmed to design sensors and memory devices? Second, how can mechanical properties be tuned at the post‐fabrication stage via external stimuli? Answering these questions requires a thorough understanding of the snapping sequences and variations of the elastic energy in multistable metamaterials. The mechanics of deformation sequences and continuous force/energy–displacement curves are comprehensively unveiled here. A 1D array, that is chain, of bistable cells is studied to explore instability‐induced energy release and snapping sequences under one external mechanical stimulus. This method offers an insight into the programmability of multistable chains, which is exploited to fabricate a mechanical sensor/memory with sampling (analog to digital‐A/D) and data reconstruction (digital to analog‐D/A) functionalities operating based on the correlation between the deformation sequence and the mechanical input. The findings offer a new paradigm for developing programmable high‐capacity read–write mechanical memories regardless of thei size scale. Furthermore, exotic mechanical properties can be tuned by harnessing the attained programmability of multistable chains. In this respect, a transversely multistable mechanical metamaterial with tensegrity‐like bistable cells is designed to showcase the tunability of chirality.

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Section: Resultsmentioning

confidence: 99%

“…Having two bistable cells with

F_{{\rm{max}}}^1 &lt; F_{{\rm{max}}}^2

in series,

F_{{\rm{min}}}^1 &lt; F_{{\rm{min}}}^2

and

F_{{\rm{min}}}^1 &gt; F_{{\rm{min}}}^2

result in three (Figure 2b4) and four (Figure 2c8) stable states, respectively. [ 16,17 ] The theory is evaluated by a set of experiments on a chain with two unit cells ( Figure ).…”

Section: Resultsmentioning

confidence: 99%

“…d) The experimental results and comparison with the theoretical predictions for the chains shown in (b). [ 16,17 ]…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Programming Multistable Metamaterials to Discover Latent Functionalities

et al. 2022

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“…[ 10–12 ] In recent years, researchers have utilized the snap‐through instability and created a variety of soft machines with fast actuating speeds. [ 13–17 ] However, high‐speed dynamic grasping tasks require not only fast actuating speed but also fast perception. For robots, instead of over‐reliance on high‐level computation, actuating by mechanical stimuli of the environment is an effective method to achieve rapid perception speed.…”

Section: Introductionmentioning

confidence: 99%

A Bioinspired Stress‐Response Strategy for High‐Speed Soft Grippers

et al. 2021

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The stress‐response strategy is one of the nature's greatest developments, enabling animals and plants to respond quickly to environmental stimuli. One example is the stress‐response strategy of the Venus flytrap, which enables such a delicate plant to perceive and prey on insects at an imperceptible speed by their soft terminal lobes. Here, inspired by this unique stress‐response strategy, a soft gripper that aims at the challenges of high‐speed dynamic grasping tasks is presented. The gripper, called high‐speed soft gripper (HSG), is based on two basic design concepts. One is a snap‐through instability that enables the HSG to sense the mechanical stimuli and actuating instantly. The other one is the spider‐inspired pneumatic‐powered control system that makes the trigger process repeatable and controllable. Utilizing the stress‐response strategy, the HSG can accomplish high‐speed sensing and grasping and handle a dynamic grasping task like catching a thrown baseball. Whereas soft machines typically exhibit slow locomotion speed and low manipulation strength for the intrinsic limitations of soft materials, the exploration of the stress‐response strategy in this study can help pave the way for designing a new generation of practical high‐speed soft robots.

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Contact‐Driven Snapping in Thermally Actuated Metamaterials for Fully Reversible Functionality

Pasini

2023

Adv Funct Materials

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Mechanical instability is often harnessed in mechanical metamaterials to generate a diverse range of functionalities, and can be triggered by either a mechanical or a field stimulus, such as temperature. Existing field-responsive metamaterials with snap-through instability, however, need to rely on a mechanical input to realize functional reversibility, a limitation depriving them of the capacity to operate solely via the applied field. This work demonstrates reversible snap-through instability in a bi-material framework that is exclusively driven by environmental temperature. The need for mechanical intervention is bypassed by leveraging the thermally induced contact and mismatched thermal expansion of the constituent materials. A combination of experiments, theory and simulations, unveils the physics underpinning the thermally driven snapping undergoing four successive regimes of deformation: noncontact, full contact, partial contact, and release. The advantages of the concept are showcased in two applications. The first is the development of thermal switches with ternary operation (OFF-ON-OFF) and logic functions, going beyond the capabilities of current binary switches. The second is reversible temporal morphing in deployable structures programmed to snap sequentially in multiple locked configurations at predefined values of temperature, opening the door to applications across sectors, such as deployable antennas, soft robots, and self-reconfigurable medical devices.

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Bi‐Shell Valve for Fast Actuation of Soft Pneumatic Actuators via Shell Snapping Interaction (Adv. Sci. 15/2021)

Cited by 4 publications

References 0 publications

Programming Multistable Metamaterials to Discover Latent Functionalities

Programming Multistable Metamaterials to Discover Latent Functionalities

A Bioinspired Stress‐Response Strategy for High‐Speed Soft Grippers

Contact‐Driven Snapping in Thermally Actuated Metamaterials for Fully Reversible Functionality

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