A Passive Thermal Switch with Kirigami‐Inspired Mesostructures

Heo, Hyeonu; Li, Shouhang; Bao, Hua; Ju, Jaehyung

doi:10.1002/adem.201900225

Cited by 22 publications

(13 citation statements)

References 40 publications

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“…As many space-faring agencies are looking into both human and robotic lunar landers, structures that harness these predictable day-night temperature shifts to perform functions are becoming increasingly relevant, since they would allow the spacecraft to survive the lunar night or would allow the spacecraft to deploy a component at the day/night interface using only the temperature change. Some examples of how these structures could be used in the lunar environment include passive switches [54] that connect a solar array to a battery during the day, while removing the connection at night. This would be designed to save the battery power to enable the survival of a non-nuclear-powered rover during the lunar night.…”

Section: Behavior Over Lunar Temperature Rangesmentioning

confidence: 99%

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Temperature-induced shape morphing of bi-metallic structures

Taniker

Celli

Pasini

et al. 2020

International Journal of Solids and Structures

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In this work, we study the thermo-mechanical behavior of metallic structures designed to significantly change shape in response to thermal stimuli. This behavior is achieved by arranging two metals with different coefficient of thermal expansion (CTE), Aluminum and Titanium, as to create displacement-amplifying units that can expand uniaxially. In particular, our design comprises a low-CTE bar surrounded by a high-CTE frame that features flexure hinges and thicker links. When the temperature increases, the longitudinal expansion of the high-CTE portion is geometrically constrained by the low-CTE bar, resulting in a large tangential displacement. Our design is guided by theoretical models and numerical simulations. We validate our approach by fabricating and characterizing individual units, one dimensional arrays and three-dimensional structures. Our work shows that structurally robust metallic structures can be designed for large shape changes. The results also demonstrate how harsh environmental conditions (e.g., the extreme temperature swings that are characteristic of extraterrestrial environments) can be leveraged to produce function in a fully passive way.

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Section: Behavior Over Lunar Temperature Rangesmentioning

confidence: 99%

“…In order to increase the overall stroke, researchers have used arrays of displacementamplifying units [40,41]. It is to be noted that few have also explored these mechanisms in the context of thermal displacements but, typically, at the microscale [52,53] or relying on bi-metallic flexures that are challenging to fabricate [27,54].…”

Section: Introductionmentioning

confidence: 99%

Temperature-induced shape morphing of bi-metallic structures

Taniker

Celli

Pasini

et al. 2020

International Journal of Solids and Structures

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“…For instance, kirigami 13 and origami 14 have inspired substrates that fold to tailor electrical behavior 15 . Elastic instabilities are also considered to transition electrical states in response to mechanical 16 and thermal 17 stresses.…”

Section: Introductionmentioning

confidence: 99%

Digital logic gates in soft, conductive mechanical metamaterials

et al. 2021

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Integrated circuits utilize networked logic gates to compute Boolean logic operations that are the foundation of modern computation and electronics. With the emergence of flexible electronic materials and devices, an opportunity exists to formulate digital logic from compliant, conductive materials. Here, we introduce a general method of leveraging cellular, mechanical metamaterials composed of conductive polymers to realize all digital logic gates and gate assemblies. We establish a method for applying conductive polymer networks to metamaterial constituents and correlate mechanical buckling modes with network connectivity. With this foundation, each of the conventional logic gates is realized in an equivalent mechanical metamaterial, leading to soft, conductive matter that thinks about applied mechanical stress. These findings may advance the growing fields of soft robotics and smart mechanical matter, and may be leveraged across length scales and physics.

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“…Active metamaterials offer excellent functionalities and tunable properties owing to their adaptable capability to change their shape in a programmable, untethered, and reversible manner, with potential applications in soft robots, [ 1 ] actuators, [ 2 ] shape‐morphing structures, [ 3 ] biomedical devices, [ 4 ] and thermal engineering devices [ 5 ] as well as for tunable physical properties, [ 6 ] elastic wave control, [ 7 ] and acoustics. [ 8 ] Combining structural mechanics and functional materials, one can reconfigure structures mainly controllable by heat, [ 9 ] light, [ 10 ] magnetic field, [ 3a,11 ] and mechanical force.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanically Triggered Reversible Multi‐Transformability of a Single Material System by Energy Swapping and Shape Memory Effects

Song

Zou

Cui

et al. 2021

Adv Funct Materials

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Thermally triggered active metamaterials with shape memory polymers (SMPs) show greater potential for structural applications with reconfigurability than other programmable structures owing to their temporally stiff condition with shape locking. However, most SMP‐based active metamaterials have not shown complex transformation, such as multi‐modal and asymmetric deformations, because of the lack of an adaptable strategy with reasonable mechanics models. Moreover, conventional SMP has a critical drawback – irreversible transformability, limiting its reconfigurability for active metamaterials. Herein, a thermomechanical tool that allows a single material system to transform with reversible, multi‐modal, and asymmetric deformations is constructed and demonstrated. Using transformation aids (TAs), a localized pre‐stress and a temperature‐dependent reverse stiffness effect to exchange energy with a lattice is conceived. The deformation of a single SMP system whose energy is swapped from TAs by localized pre‐stress and reverse stiffness can transform into reversible, multi‐modal, and asymmetric deformations with shape‐locking. The methods can be used for reconfigurable structures, tuning symmetry, and chirality, especially for active acoustic metamaterials, deployable devices, and biomedical devices. The mechanics‐inspired design approach of local deformation of TA and the interaction with the temperature‐dependent stiffness drop of the lattice open an avenue to the robust design of thermally triggered active metamaterials.

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A Passive Thermal Switch with Kirigami‐Inspired Mesostructures

Cited by 22 publications

References 40 publications

Temperature-induced shape morphing of bi-metallic structures

Temperature-induced shape morphing of bi-metallic structures

Digital logic gates in soft, conductive mechanical metamaterials

Thermomechanically Triggered Reversible Multi‐Transformability of a Single Material System by Energy Swapping and Shape Memory Effects

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