Tunable permittivity in dielectric elastomer composites under finite strains: Periodicity, randomness, and instabilities.

Goshkoderia, Artemii; Arora, Nitesh; Slesarenko, Viacheslav; Li, Jian; Chen, Vincent; Juhl, Abigail T.; Buskohl, Philip R.; Rudykh, Stephan

doi:10.1016/j.ijmecsci.2020.105880

Cited by 20 publications

(6 citation statements)

References 65 publications

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“…During this primarily homogeneous buckling pattern, the circular channels deform into a periodic pattern of horizontal and vertical elliptical channels leading to an increase in c m ; the matrix volume fraction increases in a linear fashion as the architecture deforms. [ 29,44 ] However, the initial matrix volumes in the experimental specimens were higher than their theoretical values. We observed a difference in matrix volume

({c_{{\rm{m}},\exp }} - {c_{\rm{m}}})c_{\rm{m}}^{ - 1} \approx 0.23

and 0.30 for c m = 0.35 and 0.30, respectively, in the demonstrative samples depicted in Figure 4a.…”

Section: Experimental Characterization Of Electromechanical Responsementioning

confidence: 74%

“…numerically demonstrated the potential of incorporating high permittivity, stiff inclusions in these architectures, either randomly or in a periodic fashion. [ 29 ] The inclusions effectively act as an array of micro‐capacitors; varying their shape and periodicity provides further customization of the dielectric response in the architectures. [ 29 ]…”

Section: Discussionmentioning

confidence: 99%

“…[ 29 ] The inclusions effectively act as an array of micro‐capacitors; varying their shape and periodicity provides further customization of the dielectric response in the architectures. [ 29 ]…”

Section: Discussionmentioning

confidence: 99%

“…Although we focused on a single material system for the dielectric architecture, Goshkoderia et al numerically demonstrated the potential of incorporating high permittivity, stiff inclusions in these architectures, either randomly or in a periodic fashion. [29] The inclusions effectively act as an array of micro-capacitors; varying their shape and periodicity provides further customization of the dielectric response in the architectures. [29] The microstrip patch antenna demonstrated here could be expanded to that of an array.…”

Section: Discussionmentioning

confidence: 99%

“…[ 18 ] Goshkoderia et al., presented a computational study surrounding the tunability of effective permittivity in these dielectric architectures under finite strain. [ 29 ] However, the coupled nature of their mechanical and dielectric properties has yet to be characterized experimentally and demonstrated in a FHE device.…”

Section: Introductionmentioning

confidence: 99%

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than their intrinsic material constituents. Metamaterials concepts have been demonstrated in diverse fields, including electromagnetics, acoustics, mechanics and others, exhibiting novel properties such as negative refractive index, perfect absorption, and auxetic behavior. [1][2][3][4][5] Further, metamaterials can be designed with flexible and reconfigurable substrates to achieve physically tunable responses. For instance, several examples of origami and deployable structures exhibit adaptive electromagnetic resonance tuning through physical deformation. [6][7][8][9][10] Strain-tunable dielectric materials and composites are a growing research field with recent demonstrations in optical and millimeter wave regimes. [11,12] For instance, Meerbeek et al., described the macroscopic shape of a porous elastomeric foam by measuring the shift in light reflected internally by its cellular voids during bending and twisting. [11] Zhang et al., synthesized a graphene foam with tunable microwave absorption via solid matrix densification during physical compression. [13] Additional mechanisms for strain-tuning dielectric properties include the use of permanent or induced dipoles at the molecular level; and the distribution of voids and inclusions in host matrices. [14][15][16] Elastomeric metamaterials present a deformation-based tuning strategy for regulating local periodicity and effective dielectric properties. This strategy is particularly useful in deformable electromagnetic devices where the feature size of the dielectric architecture is electrically small and physical reconfiguration of the dielectric structure will facilitate localized and controllable tuning. [14] Materials with mechanically reconfigurable dielectric properties can help address these inherent challenges for flexible hybrid electronics (FHEs) and adaptive communication devices.Elastomers have previously been leveraged for mechanical metamaterials, which are a subset of metamaterial designs with periodic architectures whose elements rotate, buckle, fold, or snap under an external load. [17] Mechanical instabilities present in many of these structures allow their rapid transformation under relatively low strains. They demonstrate unique properties like auxetic behavior, energy absorption, multistability, and nonlinear elastic properties. [18][19][20][21][22][23][24][25] The transformation of these mechanical structures provides a straightforward tuning mechanism for surrounding wave properties in optical, acoustic, and Flexible hybrid electronic (FHE) materials and devices exploit the interaction of mechanical and electromagnetic properties to operate in new form factors and loading environments, which are key for advancing wearable sensors, flexible antennas, and soft robotic skin technologies. Dielectric elastomer (DE) architectures offer a novel substrate material for this application space as they are a class of strain-tolerant and programmable metamaterials that derive their mechanical and dielectric properties from their architecture. Due to the...

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