Experimental study of multi-stable morphing structures actuated by pneumatic actuation

Ni, Xiangqi; Liao, Chongjie; Li, Yang; Zhang, Zheng; Sun, Min; Chai, Herzl; Wu, Huaping; Jiang, Shaofei

doi:10.1007/s00170-020-05301-1

Cited by 28 publications

(12 citation statements)

References 46 publications

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“…When the bistable curved plates are constructed of non‐active materials, the snap‐through bistability can be actuated passively by bonding with other soft or flexible actuators such as pneumatic, [ 200–203 ] magnetic, [ 204 ] SMA, [ 205–207 ] and piezoelectric [ 208 ] actuation. For example, inspired by the Venus flytrap leaf, Pal et al.…”

Section: Bistable and Multistable Actuators For Soft Roboticsmentioning

confidence: 99%

“…When the bistable curved plates are constructed of non-active materials, the snap-through bistability can be actuated passively by bonding with other soft or flexible actuators such as pneumatic, [200][201][202][203] magnetic, [204] SMA, [205][206][207] and piezoelectric [208] actuation. For example, inspired by the Venus flytrap leaf, Pal et al [200] developed a soft gripper that is composed of two bistable doubly curved convex plates as leaves connected by another bistable pneumatic bending actuator as both a joint and a trigger (Figure 13A).…”

Section: Passive Pneumatic Actuation For Soft Bistable Grippersmentioning

confidence: 99%

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Bistable and Multistable Actuators for Soft Robots: Structures, Materials, and Functionalities

et al. 2022

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Snap‐through bistability is often observed in nature (e.g., fast snapping to closure of Venus flytrap) and the life (e.g., bottle caps and hair clippers). Recently, harnessing bistability and multistability in different structures and soft materials has attracted growing interest for high‐performance soft actuators and soft robots. They have demonstrated broad and unique applications in high‐speed locomotion on land and under water, adaptive sensing and fast grasping, shape reconfiguration, electronics‐free controls with a single input, and logic computation. Here, an overview of integrating bistable and multistable structures with soft actuating materials for diverse soft actuators and soft/flexible robots is given. The mechanics‐guided structural design principles for five categories of basic bistable elements from 1D to 3D (i.e., constrained beams, curved plates, dome shells, compliant mechanisms of linkages with flexible hinges and deformable origami, and balloon structures) are first presented, alongside brief discussions of typical soft actuating materials (i.e., fluidic elastomers and stimuli‐responsive materials such as electro‐, photo‐, thermo‐, magnetic‐, and hydro‐responsive polymers). Following that, integrating these soft materials with each category of bistable elements for soft bistable and multistable actuators and their diverse robotic applications are discussed. To conclude, perspectives on the challenges and opportunities in this emerging field are considered.

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Section: Bistable and Multistable Actuators For Soft Roboticsmentioning

confidence: 99%

Section: Passive Pneumatic Actuation For Soft Bistable Grippersmentioning

confidence: 99%

Bistable and Multistable Actuators for Soft Robots: Structures, Materials, and Functionalities

et al. 2022

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“…Bionic design is used to design artificially some wonderful structures or phenomena that naturally exist in nature, and which can play special effects on some special occasions. Among them, the anti-symmetric cylindrical shell bionic gripper structure inspired by the Venus flytrap’s grasping mechanism is such a special structure [ 36 , 37 ], which has fast response and high grasping power, and it can well imitate the grabbing action of flytraps. In order to better utilize the characteristics of the bionic gripper structure, the optimal design of the anti-symmetric cylindrical shell is indispensable.…”

Section: Anti-symmetric Cylindrical Shellmentioning

confidence: 99%

Stable Characteristics Optimization of Anti-Symmetric Cylindrical Shell with Laminated Carbon Fiber Composite

et al. 2022

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This paper proposes a multi-objective optimization model for anti-symmetric cylindrical shell in the bionic gripper structure. Here, the response surface method is used to establish multiple surrogate models of the anti-symmetric cylindrical shell, and the non-dominated sorting genetic algorithm-II (NSGA-II) is used to optimize the design space of the anti-symmetric cylindrical shell; the design points of the anti-symmetric cylindrical shell are verified by experimental methods. The optimization goals are that the first steady state transition load (the transition process of the bionic gripper structure from the open state to the closed state) of the anti-symmetric cylindrical shell is minimized, and the second steady state transition load (the transition process of the bionic gripper structure from the closed state to the open state) is the largest. At the same time, in order to prevent stable instability caused by stress concentration in the second steady state of the anti-symmetric cylindrical shell, the maximum principal plane stress is given as the constraint condition. The validity of the optimization results is verified by finite element and experimental methods. Due to the stable transition load of the anti-symmetric cylindrical shell being significantly larger than that of the orthogonal laminated plate, therefore, the anti-symmetric cylindrical shell has potential application prospects in the application of deformable structures and bionic structures that require composite functions such as having light weight, high strength, and large clamping force. The novelty of this paper lies in the multi-objective optimization of the application of the antisymmetric bistable cylindrical shell in the bionic gripper structure.

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“…They have two different configurations, which can both be stable without the need for an ongoing actuation force [ 3 ]. Owing to their excellent characteristics and performances, these bistable polymer composite structures have been extensively studied through theoretical models [ 4 , 5 , 6 , 7 , 8 , 9 ], numerical simulations [ 10 , 11 , 12 , 13 , 14 ], and experiments [ 15 , 16 , 17 , 18 , 19 ]. In addition, research has been conducted in terms of optimization [ 20 , 21 ] and actuation [ 22 , 23 , 24 , 25 , 26 ] of such structures.…”

Section: Introductionmentioning

confidence: 99%

A Unified High-Order Semianalytical Model and Numerical Simulation for Bistable Polymer Composite Structures

et al. 2022

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Bistable polymer composite structures are morphing shells that can change shape and maintain two stable configurations. At present, mainly two types of bistable polymer composite structures are being studied: cross-ply laminates and antisymmetric cylindrical shells. This paper proposes a unified semianalytical model based on the extensible deformation assumption and nonlinear theory of plates and shells to predict bistability. Moreover, the higher-order theoretical model is extended for better prediction accuracy, while the number of degrees of freedom is not increased; this ensures a lower computational cost. Finally, based on these theoretical models, the main factors affecting the stable characteristic of the two bistable polymer composite structures are determined by comparing the models of various orders. The main challenges in describing the bistable behavior, such as bifurcation points and the curvatures of stable states, are addressed through prediction of the corner transversal displacement in stable configurations. The results obtained from the theoretical model are validated through nonlinear finite element analysis.

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Experimental study of multi-stable morphing structures actuated by pneumatic actuation

Cited by 28 publications

References 46 publications

Bistable and Multistable Actuators for Soft Robots: Structures, Materials, and Functionalities

Bistable and Multistable Actuators for Soft Robots: Structures, Materials, and Functionalities

Stable Characteristics Optimization of Anti-Symmetric Cylindrical Shell with Laminated Carbon Fiber Composite

A Unified High-Order Semianalytical Model and Numerical Simulation for Bistable Polymer Composite Structures

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