Design of Hierarchical Structures for Synchronized Deformations

Seifi, Hamed; Javan, Anooshe Rezaee; Ghaedizadeh, Arash; Shen, Jianhu; Xu, Shanqing; Xie, Yi Min

doi:10.1038/srep41183

Cited by 12 publications

(11 citation statements)

References 34 publications

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“…[20][21][22][23][24][25] The out-of-plane buckling behavior of thin hierarchical kirigami sheets remains largely unexplored, and the only closely related study focuses on a system in which patterned notches are introduced in addition to cuts to guide the pop-up in a preferred direction. We find that for sufficiently small thicknesses, the behavior is completely different from that previously reported for thick sheets, [20][21][22][23][24][25][26][27][28][29][30] as mechanical instabilities triggered by the applied deformation result in the formation of complex 3D patterns and sequential pop-up processes. We first use a combination of experiments and numerical simulations to study the response under uniaxial tension of kirigami sheets with hierarchical cuts arranged to form an array of squares connected at their vertices via thin ligaments and investigate in detail both the effect of geometry as well as plasticity of the sheets.…”

contrasting

confidence: 88%

“…We first use a combination of experiments and numerical simulations to study the response under uniaxial tension of kirigami sheets with hierarchical cuts arranged to form an array of squares connected at their vertices via thin ligaments and investigate in detail both the effect of geometry as well as plasticity of the sheets. We find that for sufficiently small thicknesses, the behavior is completely different from that previously reported for thick sheets, [20][21][22][23][24][25][26][27][28][29][30] as mechanical instabilities triggered by the applied deformation result in the formation of complex 3D patterns and sequential pop-up processes. We then show that the geometric parameters of the embedded hierarchy enable us to tune both the morphology of the buckling-induced 3D patterns as well as the stress-strain response of the surfaces.…”

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confidence: 67%

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Programmable Hierarchical Kirigami

Domel

Zhou

et al. 2019

Adv Funct Materials

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Kirigami-the Japanese art of cutting paper-has recently inspired the design of highly stretchable and morphable mechanical metamaterials that can be easily realized by embedding an array of cuts into a sheet. This study focuses on thin plastic sheets perforated with a hierarchical pattern of cuts arranged to form an array of hinged squares. It is shown that by tuning the geometric parameters of this hierarchy as well as thickness and material response of the sheets not only a variety of different bucklinginduced 3D deformation patterns can be triggered, but also the stress-strain response of the surface can be effectively programmed. Finally, it is shown that when multiple hierarchical patterns are brought together to create one combined heterogeneous surface, the mechanical response can be further tuned and information can be encrypted into and read out via the applied mechanical deformation.

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contrasting

confidence: 88%

contrasting

confidence: 67%

Programmable Hierarchical Kirigami

Domel

Zhou

et al. 2019

Adv Funct Materials

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“…Apart from the out‐of‐plane deformations under stretching, the kirigami strategy also enables in‐plane rotations of the components in response to in‐plane stretching . The essence of this kirigami design is to divide the planar structure into rotating units by strategic cutting patterns, as exemplified in Figure e.…”

Section: Structural Designs Of Devices and Systemsmentioning

confidence: 99%

Mechanically‐Guided Structural Designs in Stretchable Inorganic Electronics

et al. 2019

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but remove the constraints of rigid, brittle, planar, wafer substrates, through the strategic integration with soft elastomers. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Compared with the conventional rigid devices, stretchable inorganic electronics not only allow large deformations without degradation in electronic performances, but also yield conformal integration with the complex surfaces of tissues of the human body. [8,[15][16][17][18][19][20] Due to these unique advantages, stretchable inorganic electronics technologies significantly broaden the application areas of conventional electronics, and also enable novel uses in health monitoring, advanced humanmachine interfaces and internet of things, such as epidermal electronics, [21][22][23][24][25] curvilinear electronics, [26][27][28] deformable optoelectronics, [29][30][31][32][33][34] transient electronics, [35][36][37] and many other bioelectronic systems. [38][39][40] With a series of rapid developments over more than a dozen of years, stretchable inorganic electronic systems now define a well-recognized and active field of study, encompassing a diverse range of fundamental and applied topics, [41][42][43][44][45][46][47][48][49][50][51][52][53] including, for example, a collection of unusual material/structure designs and techniques to integrate hard inorganic semiconductor components and geometrically structural interconnects in optimized layouts onto patterned soft substrates. [7,54,55] Stretchable electronics have achieved high levels of sophistication largely through the use of inorganic active materials. According to the utility of different conductive materials, stretchable inorganic electronics can be classified into three categories, including those based on the composite stretchable conductors, liquid metals, and structured semiconductors/metals. [49,[56][57][58] In the first category, novel nanomaterials dispersed into a polymer matrices form composite films or fibers, by coating, dipping, printing, and electrospinning. Various nanomaterials have been exploited in this context, including metal nanoparticles, nanowires, nanoflakes, and the allotropes of carbon (carbon nanotubes, graphene, and carbon blacks). [59][60][61][62][63][64][65][66] A key to this strategy is in maintaining interconnected pathways through these nanomaterials to enable highly conductive channels when the substrate is stretched. [67][68][69][70][71] Despite great progress, the conductivities of such composites are typically lower than those of conventional metals. The second category of stretchable inorganic conductors relies on liquid metals patterned and encapsulated into channels of elastomeric materials. [72,73] Such constructs can be bent and stretched to levels beyond those possible with conventional electronic materials.Over the past decade, the area of stretchable inorganic electronics has evolved very rapidly, in part because the results have opened up a series of unprecedented applications with broad interest and potential for impact, especially in bio-inte...

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“…This means that moving material from the middle part of each cell-wall closer to the vertexes or replacing the nodes with other structures can potentially increase the transverse stiffness and strength [21–25]. Based on this concept, the in-plane mechanical properties of hierarchical honeycombs have been investigated [21–36]. For example, Vaziri and his cooperators [21–25] studied the in-plane mechanical properties of anisotropic and optimal fractal-like hierarchical honeycombs.…”

Section: Introductionmentioning

confidence: 99%

“…Seifi et al. [34] proposed a general method for creating a new type of hierarchical structures for synchronized deformations by introducing a simple rule based on the rotate-and-mirror procedure. Sun et al.…”

Section: Introductionmentioning

confidence: 99%

In-plane dynamic crushing behaviors of joint-based hierarchical honeycombs with different topologies

Zhang

Shen

et al. 2021

Jnl of Sandwich Structures & Materials

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Introducing the hierarchy into cellular materials has attracted increasing attention in the effort to pursue improved absorbed-energy abilities and impact resistance. In this paper, the dynamic crushing properties and energy absorption capacities of joint-based hierarchical honeycombs with different topologies were explored by means of explicit dynamic finite element (FE) analysis using ANSYS/LS-DYNA. Four types of joint-based hierarchical honeycombs with uniform cell-wall thickness were firstly constructed by substituting each vertex of regular honeycombs with a smaller self-similar cell (hexagon or square). The respective influences of hierarchical parameters and impact velocities on in-plane dynamic deformation modes, mechanical characteristic and energy absorption of joint-based hierarchical honeycombs were discussed. Research results showed that the hierarchy had a far greater influence on the in-plane deformation modes of honeycombs. Compared with regular honeycombs, the dynamic plateau stress and specific energy absorption of joint-based hierarchical honeycombs can be improved if the proper hierarchical parameters were chosen. Adding the joint-based hierarchy into regular honeycombs can enhance the crushing stress efficiency (CSE) of the specimens. In addition, by introducing a non-dimensional dynamic sensitivity index, the dynamic shock enhancement of hierarchical honeycombs was also investigated. These researches are useful for the multi-objective dynamic optimization design and controllable properties of cellular materials.

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Design of Hierarchical Structures for Synchronized Deformations

Cited by 12 publications

References 34 publications

Programmable Hierarchical Kirigami

Programmable Hierarchical Kirigami

Mechanically‐Guided Structural Designs in Stretchable Inorganic Electronics

In-plane dynamic crushing behaviors of joint-based hierarchical honeycombs with different topologies

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