Programmable mechanical metamaterials based on hierarchical rotating structures

Li, Xiang; Fan, Rong; Fan, Zhengjie; Lü, Yang

doi:10.1016/j.ijsolstr.2021.01.028

Cited by 29 publications

(12 citation statements)

References 55 publications

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“…It can be used as a mechanical cloak which was first fabricated by Bückmann. 6 Based on re-entrant structures, 7,8 chiral/anti-chiral structures, 9,10 rotating square structures 11,12 or slit perforation structures, 13 negative Poisson's ratio metamaterials behave counterintuitively compared to natural materials upon stretching, i.e. , tensile stress in one direction leads to an increased dimension in the orthogonal direction, which find application in the fields of biomedicine, 14,15 smart sensors, 16–18 and protective equipment.…”

Section: Introductionmentioning

confidence: 99%

Modular reprogrammable 3D mechanical metamaterials with unusual hygroscopic deformation modes

Yisong

Liu

et al. 2023

Mater. Horiz.

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Section: Introductionmentioning

confidence: 99%

Modular reprogrammable 3D mechanical metamaterials with unusual hygroscopic deformation modes

Yisong

Liu

et al. 2023

Mater. Horiz.

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“…In recent years, many studies have been conducted on various mechanical metamaterials, including multistable, bimode/ pentamode, and programmable metamaterials, as well as metamaterials with negative swelling, negative stiffness, and negative compressibility. [21] Auxetic materials can be classified on the basis of architectural configuration as follows: chiral, [22,23] reentrant, [24,25] rotational, [26,27] antichiral, [28,29] foam, [30] and porous [31] structures. To this long list, multiscale and reprogrammable metamaterials can also be added.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Mechanical Properties of Auxetic Metamaterials by Incorporating Nonrectangular Cross Sections into Their Component Rods: A Finite Element Analysis

Kavakli

Davar

2023

Physica Status Solidi (b)

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Herein, four prevalent architectures of metamaterials, namely, the arc‐star, star, reentrant, and antichiral models, are examined to study the effects of the cross‐sectional shapes of component rods on the stiffness and Poisson's ratios of the materials. Four differently sized cross sections of rods are designed, and two types of cross‐sectional geometries—square and I‐shaped—are adopted. Aspect ratios of 0.5, 0.75, and 1 are considered for the I‐shaped cross‐sectional models. A total of 64 metamaterial models are analyzed. The results show that the stiffness and negative Poisson's ratios of the metamaterials depend primarily on their architectures. For example, the antichiral model exhibits approximately 13 times more stiffness than its arc‐star counterpart. The cross‐sectional geometries of the component rods also play an essential role in the mechanical behaviors of the metamaterials. For instance, the antichiral architecture, which consists of bars with an I‐shaped section that has a width‐to‐height ratio of 0.5, has an elastic modulus 9 times greater than that of the model composed of bars with a square cross section. This study shows that it is possible to design metamaterials several times stronger simply by changing the shape of the cross section of their constituent elements without compromising on their lightweight property.

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“…Recently, it was also reported that the design of the hierarchical square system can be modified in order to change its characteristic. [ 4,50–53 ] Similar studies based primarily on the extent of the observed auxeticity were also conducted for structures based on rotating rectangles [ 54 ] as well as re‐entrant and other honeycombs. [ 54–58 ]…”

Section: Introductionmentioning

confidence: 99%

“…Recently, it was also reported that the design of the hierarchical square system can be modified in order to change its characteristic. [4,[50][51][52][53] Similar studies based primarily on the extent of the observed auxeticity were also conducted for structures based on rotating rectangles [54] as well as re-entrant and other honeycombs. [54][55][56][57][58] Even though the concept of hierarchical mechanical metamaterials proved to be very popular and resulted in numerous publications, it is possible to note that the hierarchical structures proposed up to date normally share several limitations.…”

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confidence: 99%

Micro‐Scale Auxetic Hierarchical Mechanical Metamaterials for Shape Morphing

et al. 2022

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years, it has been possible to note an emergence of promising directions of studies that address the possibility of observing these effects. In fact, one of the most interesting directions of studies related to this topic are mechanical metamaterials, [3,[28][29][30][31][32] that is, structures that can exhibit counterintuitive mechanical behavior based primarily on their design. Mechanical metamaterials are known for their ability to exhibit counterintuitive mechanical properties such as auxetic behavior, [33][34][35][36][37][38][39][40] negative stiffness [2,41] and negative compressibility [42,43] that are essential in many industries. However, in a vast majority of cases, standard mechanical metamaterial proved insufficient while searching for structures capable of exhibiting versatile deformation patterns. This in turn led to intensive studies devoted to hierarchical mechanical metamaterials, [44][45][46] that is, structures composed of elements having their own geometry that normally can deform irrespective of the rest of the system.Despite the large popularity of hierarchical mechanical metamaterials, it is a relatively new thread in the field of mechanical metamaterials. It seems that some of the first studies devoted to this topic were published by Gatt et al. [45] and Cho et al. [46] where the famous hierarchical rotating square system was proposed. In the following years, it was demonstrated [45][46][47][48][49] that this structure can exhibit tunable auxetic behavior where the extent of auxeticity depends on the relative rate of the deformation of hierarchical levels constituting the system. Recently, it was also reported that the design of the hierarchical square system can be modified in order to change its characteristic. [4,[50][51][52][53] Similar studies based primarily on the extent of the observed auxeticity were also conducted for structures based on rotating rectangles [54] as well as re-entrant and other honeycombs. [54][55][56][57][58] Even though the concept of hierarchical mechanical metamaterials proved to be very popular and resulted in numerous publications, it is possible to note that the hierarchical structures proposed up to date normally share several limitations. First, most of the known hierarchical mechanical metamaterials are designed in a way where their different hierarchical levels correspond either to the same deformation mechanism or to structures having very similar Poisson's ratio. Hence, the possible range of the resultant auxetic behavior is relatively small and may prove to be insufficient in the case of applications where functional materials must significantly change their mechanical response. Another limitation of the already reported hierarchical metamaterials is the fact that in a vast majority of cases, their ability to exhibit the tunable mechanical behavior Shape morphing and the possibility of having control over mechanical properties via designed deformations have attracted a lot of attention in the materials community and led to a variety of applications w...

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Programmable mechanical metamaterials based on hierarchical rotating structures

Cited by 29 publications

References 55 publications

Modular reprogrammable 3D mechanical metamaterials with unusual hygroscopic deformation modes

Modular reprogrammable 3D mechanical metamaterials with unusual hygroscopic deformation modes

Enhancing the Mechanical Properties of Auxetic Metamaterials by Incorporating Nonrectangular Cross Sections into Their Component Rods: A Finite Element Analysis

Micro‐Scale Auxetic Hierarchical Mechanical Metamaterials for Shape Morphing

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