Transformation from 2D meta-pixel to 3D meta-pixel using auxetic kirigami for programmable multifunctional electromagnetic response

Le, Dinh Hai; Xu, Ying; Tentzeris, Manos M.; Lim, Sungjoon

doi:10.1016/j.eml.2020.100670

Cited by 25 publications

(15 citation statements)

References 40 publications

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“…3D printed chiral auxetic metamaterials display sufficient stability under different external stimuli making them apt for applications such as drug delivery and camouflage [223]. Multifunctional metamaterials combined with Kirigami auxetics are used to obtain programmable electromagnetic responses for similar applications [224]. These structures show a detectable change in the conductivity on the application of bending or twisting loads.…”

Section: Applicationsmentioning

confidence: 99%

On the application of additive manufacturing methods for auxetic structures: a review

2021

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Auxetic structures are a special class of structural components that exhibit a negative Poisson's ratio (NPR) because of their constituent materials, internal microstructure, or structural geometry. To realize such structures, specialized manufacturing processes are required to achieve a dimensional accuracy, reduction of material wastage, and a quicker fabrication. Hence, additive manufacturing (AM) techniques play a pivotal role in this context. AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy. Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task. In this study, a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is presented. The advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional structures. Therefore, the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic structures. The article opens with a brief history of the growth of auxetic materials and later auxetic structures. Subsequently, discussions centering on the different AM techniques employed for the realization of auxetic structures are conducted. The basic principle, advantages, and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of research. Furthermore, the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and shortcomings. In addition, the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the latermentioned applications. Finally, valuable insights into the applications, limitations, and prospects of AM for auxetic structures are provided to enable the readers to gauge the vitality of such manufacturing as a production method.

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Section: Applicationsmentioning

confidence: 99%

On the application of additive manufacturing methods for auxetic structures: a review

2021

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“…Despite the large number of engineered Poisson’s-ratio metamaterial designs, which have been proposed in the last four decades, the field remains rich with new and creative innovations. Some of these innovations include the incorporation of buckling 30 – 32 , origami 33 – 37 , and kirigami 38 , 39 to achieve increasingly demanding Poisson’s-ratio behaviors. Others have used the random placement of flexible elements 40 , fibers 41 , 42 , or pores 43 to achieve stochastically engineered negative or zero Poisson’s ratio behaviors.…”

Section: Introductionmentioning

confidence: 99%

Sequential metamaterials with alternating Poisson’s ratios

et al. 2022

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Mechanical metamaterials have been designed to achieve custom Poisson’s ratios via the deformation of their microarchitecture. These designs, however, have yet to achieve the capability of exhibiting Poisson’s ratios that alternate by design both temporally and spatially according to deformation. This capability would enable dynamic shape-morphing applications including smart materials that process mechanical information according to multiple time-ordered output signals without requiring active control or power. Herein, both periodic and graded metamaterials are introduced that leverage principles of differential stiffness and self-contact to passively achieve sequential deformations, which manifest as user-specified alternating Poisson’s ratios. An analytical approach is provided with a complementary software tool that enables the design of such materials in two- and three-dimensions. This advance in design capability is due to the fact that the tool computes sequential deformations more than an order of magnitude faster than contemporary finite-element packages. Experiments on macro- and micro-scale designs validate their predicted alternating Poisson’s ratios.

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“…Poisson's ratio defines the ratio between two characteristics of the transverse and longitudinal strain of a structure, and NPR behavior has been discovered in auxetic materials that expand (contract) in the transverse direction when stretched (compressed), instead of usual materials (Figure 1) [10][11][12][13][14]. Such an auxetic behavior is found in some hexagonal [15][16][17][18][19][20] and kirigami honeycombs [21][22][23][24][25][26][27]. Auxeticinspired designs for flexible membranes and substrates are attracting growing attention in developing the next generation of highly efficient piezoelectric sensors and harvesters.…”

Section: Introductionmentioning

confidence: 99%

MetaMembranes for the Sensitivity Enhancement of Wearable Piezoelectric MetaSensors

Farhangdoust

Georgeson

Ihn

2022

Sensors

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The low stretchability of plain membranes restricts the sensitivity of conventional diaphragm-based pressure and inflatable piezoelectric sensors. Using theoretical and computational tools, we characterized current limitations and explored metamaterial-inspired membranes (MetaMems) to resolve these issues. This paper develops two MetaMem pressure sensors (MPSs) to enrich the sensitivity and stretchability of the conventional sensors. Two auxetic hexagonal and kirigami honeycombs are proposed to create a negative Poisson’s ratio (NPR) in the MetaMems which enables them to expand the piezo-element of sensors in both longitudinal and transverse directions much better, and consequently provides the MPSs’ diaphragm a higher capability for flexural deformation. Polyvinylidene fluoride (PVDF) and polycarbonate (PC) are considered as the preferable materials for the piezo-element and MetaMem, respectively. A finite element analysis was conducted to investigate the stretchability behavior of the MetaMems and study its effect on the PVDF’s polarization and sensor sensitivity. The results obtained from theoretical analysis and numerical simulations demonstrate that the proposed MetaMems enhance the sensitivity of pressure sensors up to 3.8 times more than an equivalent conventional sensor with a plain membrane. This paper introduces a new class of flexible MetaMems to advance wearable piezoelectric metasensor technologies.

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Transformation from 2D meta-pixel to 3D meta-pixel using auxetic kirigami for programmable multifunctional electromagnetic response

Cited by 25 publications

References 40 publications

On the application of additive manufacturing methods for auxetic structures: a review

On the application of additive manufacturing methods for auxetic structures: a review

Sequential metamaterials with alternating Poisson’s ratios

MetaMembranes for the Sensitivity Enhancement of Wearable Piezoelectric MetaSensors

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