Cyclic response of 3D printed metamaterials with soft cellular architecture: The interplay between as-built defects, material and geometric non-linearity

Gavazzoni, Matteo; Foletti, S.; Pasini, Damiano

doi:10.1016/j.jmps.2021.104688

Cited by 15 publications

(7 citation statements)

References 54 publications

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“…At the end of the test, a strain of 0.04 is registered, indicating a permanent set not fully recovered even after several hours from the test end. These characteristics are qualitatively comparable with those observed in soft polymeric lattices exhibiting viscoelasticity and localized plasticity under cyclic loading 45 . Further work is required to quantitatively assess the response we observed and the role of the governing factors.…”

Section: Resultssupporting

confidence: 82%

Rigidly flat-foldable class of lockable origami-inspired metamaterials with topological stiff states

et al. 2022

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Origami crease patterns have inspired the design of reconfigurable materials that can transform their shape and properties through folding. Unfortunately, most designs cannot provide load-bearing capacity, and those that can, do so in certain directions but collapse along the direction of deployment, limiting their use as structural materials. Here, we merge notions of kirigami and origami to introduce a rigidly foldable class of cellular metamaterials that can flat-fold and lock into several states that are stiff across multiple directions, including the deployment direction. Our metamaterials rigidly fold with one degree of freedom and can reconfigure into several flat-foldable and spatially-lockable folding paths due to face contact. Locking under compression yields topology and symmetry changes that impart multidirectional stiffness. Additionally, folding paths and mixed-mode configurations can be activated in situ to modulate their properties. Their load-bearing capacity, flat-foldability, and reprogrammability can be harnessed for deployable structures, reconfigurable robots, and low-volume packaging.

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Section: Resultssupporting

confidence: 82%

Rigidly flat-foldable class of lockable origami-inspired metamaterials with topological stiff states

et al. 2022

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“…The former represents the material stiffness, and the latter describes the loss of energy within the material through plastic deformation, accrued in this case by the morphological changes and molecular motion of the polymer chains. The expressions for the modulus are [38]:…”

Section: Dynamic Mechanical Testmentioning

confidence: 99%

Stretchable kirigami-inspired conductive polymers for strain sensors applications

Abbasipour

Kateb

Cicoira

et al. 2023

Flex. Print. Electron.

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Kirigami metamaterials can be exploited in stretchable electronics owing to their architecture, which can be leveraged to amplify stretchability, bendability and deformability. Herein, we report a stretchable kirigami-structured poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/polydimethylsiloxane (PDMS) polymer composite. The electromechanical response and mechanical behavior of kirigami PEDOT:PSS-coated PDMS and polymer composite specimens were investigated and compared with their non-kirigami counterparts. The kirigami structure exhibited improved electromechanical properties owing to its characteristic architecture. This study illustrates the application of a kirigami polymer composite as a strain sensor for human motion detection.

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“…Imperfections-traditionally considered a hazard in most mechanical systems-tailored to the preferred mode, can be used to tweak the energy landscape and hence to alleviate this problem. In quasi-static metamaterial designs they have allowed branching into specific chosen bifurcation paths [56,63], while they can enable switching between modes when combined with viscoelasticity [49]. This means that imperfections can also be programmed specifically to change the loading rate at which mode switching occurs.…”

Section: Dissipation To Seed Dynamic Imperfectionsmentioning

confidence: 99%

The Extreme Mechanics of Viscoelastic Metamaterials

Dykstra¹,

Janbaz²,

Coulais³

2022

Preprint

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Mechanical metamaterials made of flexible building blocks can exhibit a plethora of extreme mechanical responses, such as negative elastic constants, shape-changes, programmability and memory. To date, dissipation has largely remained overlooked for such flexible metamaterials. As a matter of fact, extensive care has often been devoted in the constitutive materials' choice to avoid strong dissipative effects. However, in an increasing number of scenarios, where metamaterials are loaded dynamically, dissipation can not be ignored. In this review, we show that the interplay between mechanical instabilities and viscoelasticity can be crucial and can be harnessed to obtain new functionalities. We first show that this interplay is key to understanding the dynamical behaviour of flexible dissipative metamaterials that use buckling and snapping as functional mechanisms. We further discuss the new opportunities that spatial patterning of viscoelastic properties offer for the design of mechanical metamaterials with properties that depend on loading rate.

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Cyclic response of 3D printed metamaterials with soft cellular architecture: The interplay between as-built defects, material and geometric non-linearity

Cited by 15 publications

References 54 publications

Rigidly flat-foldable class of lockable origami-inspired metamaterials with topological stiff states

Rigidly flat-foldable class of lockable origami-inspired metamaterials with topological stiff states

Stretchable kirigami-inspired conductive polymers for strain sensors applications

The Extreme Mechanics of Viscoelastic Metamaterials

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