Bistable structures with controllable wrinkled surface

Lin, Junjie; Guo, Qiaohang; Dou, Shiwen; Hua, Nengbin; Zheng, Chan; Pan, Yian; Huang, Youting; Chen, Zi; Chen, Wenzhe

doi:10.1016/j.eml.2020.100653

Cited by 13 publications

(4 citation statements)

References 44 publications

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“…[ 29 ] Cylindrical bistable structures have been produced by introducing predetermined directional strains to the laminates by prestretching before laminating. [ 29 ] By changing the strain field of the laminate mechanically [ 30 ] or electrically, [ 31 ] the bistable structures snap from one stable state to the other.…”

Section: Biological Actuatorsmentioning

confidence: 99%

Bioinspired Structures for Soft Actuators

Wei

Ghosh

2022

Adv Materials Technologies

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biological energy into mechanical output. In addition to the actively controlled actuation behavior, plants also produce passive motions driven by the swelling and drying of cellulose materials on the cell walls under the ambient moisture change. [3] These cell-level actuators are shaped, assembled, and structured with other components hierarchically, determining their macroscopic actuation performance. From the mechanical point of view, the actuation behaviors are governed by the stress and strain distribution at various levels of the structure composed of well-arranged active components and supportive matrices. The opening of a pinecone best manifests this principle to release seeds at low humidity conditions. [4] Consisting of two macroscopic layers of tissues with different coefficients of hygroscopic swelling, the scales of pinecone bend outward as the outer layer shrinks more significantly under decreasing humidity. Interestingly, the swelling ability of the two layers is governed at the cellular level, as the special cellulose fibril arrangements on the cell walls effectively modify the stiffness of the cells. While bioinspiration aims to reproduce a functional outcome by drawing on ideas from nature or understanding the principles that underlie natural processes, biomimicry seeks to replicate the mechanism underlying the specific functional behavior found in nature. Notwithstanding the subtle distinction, understanding the fundamentals of biological functions allows us to appreciate why cells and organisms have the structures they do and provides clues to create synthetic systems. Structural design solutions in nature have always been a source of inspiration for scientists and engineers to advance their fields, such as robust yet resilient mechanical structures, [5] biomimetic functional textiles, [6] dry adhesives, [7] drag reduction surfaces, [8] etc. Given that actuation is essential for almost all manmade machines to accomplish their designed functions, scientists are continually looking at every natural environment to find inspiration and ideas to create the new generation of automatons soft robots that can stretch, flex, and morph with high degrees of freedom (DOF). Compared to the conventional rigid actuators such as electric motors, the soft actuators have mechanical properties and actuation behaviors closer to the natural actuators. Therefore, the lessons from nature, particularly the intimate relationship between the structures of biological actuators and their behavior from cellular processes to whole organism functions, provide tremendous insights into designing soft actuators.Biological organisms present marvelous morphing behaviors from the quiescent blooming of flowers to the energetic wing-flapping of birds that have always inspired humans to design better-engineered products. The diversity of natural motion is attributed primarily to the intricate and hierarchical structure of actuators that are self-assembled from nanoscale structures to superstructures. Compared to the biological actuat...

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Section: Biological Actuatorsmentioning

confidence: 99%

Bioinspired Structures for Soft Actuators

Wei

Ghosh

2022

Adv Materials Technologies

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“…However, this bi-stable structure has low stiffness, and the dissolution process requires a large number of organic solvents, which is not environmentally friendly and not suitable for mass production. At present, the external actuating forces for the response of intelligent structures are mainly smart-actuating [ 13 , 14 , 15 , 16 , 17 ] and mechanical-force-actuating [ 18 , 19 ]. Among them, light is a common, natural source of light and clean energy, which can be turned on and off at long distances [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

A Flexible Bi-Stable Composite Antenna with Reconfigurable Performance and Light-Responsive Behavior

et al. 2023

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An integrated solution providing a bi-stable antenna with reconfigurable performance and light-responsive behavior is presented in this paper for the first time. The proposed antenna includes a radiation layer with conductivity, which is integrated onto the bi-stable substrate. First, the effect of the radiation layer material and substrate layer parameters on antenna performance was studied. The experiment showed that an antenna with CNTF has a wider impedance bandwidth than one with CSP, namely 10.37% versus 3.29%, respectively. The resonance frequency increases gradually with the increase in fiber laying density and fiber linear density. Second, the influence of state change of the substrate layer on the antenna radiation pattern was studied. The measured results showed that the maximum radiation angle and gain of states I and II are at 90°, 1.21 dB and 225°, 1.53 dB, respectively. The gain non-circularities of the antenna at states I and II are 4.48 dB and 8.35 dB, respectively, which shows that the antenna has good omnidirectional radiation performance in state I. The display of the array antenna, which shows that the array antenna has good omnidirectional radiation performance in state A, with gain non-circularities of 4.20 dB, proves the feasibility of this bi-stable substrate in reconfigurable antennas. Finally, the antenna deforms from state I to state II when the illumination stimulus reaches 22 s, showing good light-responsive behavior. Moreover, the bi-stable composite antenna has the characteristics of small size, light weight, high flexibility, and excellent integration.

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“…spherical bilayer structure may exhibit different morphology, as investigated in the work of Pezzulla et al [6]. Lin et al [7] mechanically stretched the top and bottom soft films to certain pre-strains before pasting them with the middle layer. Depending on the pre-strains, the obtained trilayer structure may produce bistable deformations.…”

Section: Introductionmentioning

confidence: 99%

Controllable bistable smart composite structures driven by liquid crystal elastomer

Kang¹,

Liu²,

Wang³

2021

Smart Mater. Struct.

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In this article, we proposed a new way to achieve monostable and bistable characteristics of composite layers based on liquid crystal elastomer (LCE). A smart trilayer composite structure is fabricated using LCE and acrylic elastomer, which can have several morphologies. It keeps flat at room temperature and can deform into a monostable saddle or bistable cylinder surface in response to simple temperature changes. The reversible deformation can be controlled through two parameters including geometrical size and actuation strain. The LCE can be programmed to generate different actuation strains by different formulas during synthesis or different mechanical stretches during UV radiation. The deformed morphology for different sample sizes and actuation strain is calculated using Finite element simulation. By comparison with the experimental results, we confirm that the phenomena can be captured through numerical simulations. Furthermore, to have a quantitative understanding, we use numerical simulation to calculate the deformation of the composite structure by tuning these two parameters and give a morphological portrait illustrating the relationship between the deformed shape and control parameters.

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Bistable structures with controllable wrinkled surface

Cited by 13 publications

References 44 publications

Bioinspired Structures for Soft Actuators

Bioinspired Structures for Soft Actuators

A Flexible Bi-Stable Composite Antenna with Reconfigurable Performance and Light-Responsive Behavior

Controllable bistable smart composite structures driven by liquid crystal elastomer

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