Assembled mechanical metamaterials with transformable shape and auxeticity

Lang, Jian Ping; Jiang, Wei; Teng, Xing Chi; Zhang, Xue Gang; Han, Dong; Hao, Jian; Xu, Hang Hang; Ni, Xi Hai; Xie, Yi Min; Qin, Qing Hua; Yang, Jian; Ren, Xin

doi:10.1016/j.conbuildmat.2023.131181

Cited by 26 publications

(2 citation statements)

References 76 publications

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“…Physical auxetic structures containing bow-tie units were created by specially bent components or by 3D printing [38] The method used is similar to the well-known interlocking assembly process [39].…”

Section: Physical Models Of Structures Assembled From Strutsmentioning

confidence: 99%

Experimental Study of Auxetic Structures Made of Re-Entrant (“Bow-Tie”) Cells

Plewa,

Płońska,

Feliksik

et al. 2024

Materials

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This article presents a study of metamaterial structures that exhibit auxetic properties. This unusual phenomenon of simultaneous orthogonal expansion of the metamaterial in tension, and vice versa in compression, with vertical and horizontal contraction, is explored for structures made of re-entrant unit cells. The geometry of such structures is analysed in detail, and the relationships are determined by the value of the Poisson’s ratio. It is shown that the Poisson’s ratio depends not only on the geometry of the unit cell but also on the degree of strain. Depending on the dimensions of the structure’s horizontal and inclined struts, the limit values are determined for the angle between them. By creating physical structures made of re-entrant cells, it is demonstrated that the mechanism of change in the structure’s dimensions is not due to the hinging but to the bending of the struts. The experimental section contains the results of compression tests of a symmetrical structure and tensile tests of a flat mesh structure. In the case of the mesh structure, a modification of the re-entrant cells was used to create arched strut joints. This modification makes it possible to obtain greater elongation of the mesh structure and larger NPR values.

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Section: Physical Models Of Structures Assembled From Strutsmentioning

confidence: 99%

Experimental Study of Auxetic Structures Made of Re-Entrant (“Bow-Tie”) Cells

Plewa,

Płońska,

Feliksik

et al. 2024

Materials

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“…The re-entrant honeycomb structure has attracted widespread attention due to its excellent mechanical properties. Various researches have been conducted on the re-entrant honeycomb structures including assembly honeycomb structures [33], chiral structures [34][35][36], tubular structures [37,38], star structures [39,40], and sandwich plate structure [41][42][43]. These structures have counter-intuitive deformation behavior [44,45], and expand (contract) under tension (compression).…”

Section: Introductionmentioning

confidence: 99%

Auxetic hybrid metamaterial with tunable elastic wave bandgap

Chen,

Tao,

Luo

et al. 2024

Smart Mater. Struct.

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Auxetic metamaterials have shown good stability and uniform deformation capabilities against influences (vibration, temperature change, load change), making them significant in maintaining and adjusting the bandgap of phonon crystals. The low-frequency and broadband are the important goals of phonon crystals. For most traditional re-entrant honeycomb structures (T-RHS), the bandgap range is narrow and tunability is poor. Here, an auxetic hybrid structure with tunable acoustic bandgap (AHS-T) consisting of periodic mass inclusions integrated with traditional re-entrant honeycomb and chiral hybrid is proposed. Aiming at investigating the tunability of the bandgap in the low-frequency range. Compared with T-RHS, the bandgap real-time adjustment and wider bandwidth of the AHS-T be realized during compression and tension. The numerical results show that the bandgap of the AHS-T can be flexibly tailored by reasonably adjusting the strain and geometrical configurations of AHS-T. The bandwidth of AHS-T can be increased to 87.1% when the bottom diameter and column height H of the scatterer are changed reasonably. Moreover, the deformation behavior of auxetic material has an auxiliary effect on expanding the bandwidth. Compared with the structure which is not subjected to load, the adjustable amplitude of the bandgap is 41%. The findings of this work provide a design idea for manipulating elastic waves in dynamic environment.

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In‐Plane Crashworthiness of Gradient Curved‐Walled Honeycombs: Experimental, Numerical Simulation, and Theoretical Analysis

Yang,

Ke,

et al. 2024

Adv Eng Mater

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Honeycombs are widely used in engineering protection, while the gap between peak and mean stresses remains to be narrowed, and the interaction effects among walls are weak. To break these limits, gradient curved‐walled honeycombs have been proposed recently. However, their in‐plane crashworthiness has never been studied, which restricts the actual applications in complex load environment. For this purpose, this article adopts experiments, finite‐element simulations, and theoretical analysis to reveal in‐plane crash performance of gradient curved‐walled honeycombs. Quasistatic and dynamic experiments are carried out for 3D‐printed honeycomb specimens made of 316L stainless steel, and numerical simulations are conducted by ABAQUS/Explicit. Compared to traditional straight‐ and curved‐walled honeycombs, gradient curved‐walled honeycombs display stabler deformation mode and more efficient mechanical response. Their EA and SEA are respectively 25.5% and 6.4% larger than straight‐walled honeycombs, and their energy absorption and force efficiencies are nearly 2.4 and 5.3 times larger, respectively. On this basis, plastic hinge model with high accuracy has been established, to derive the analytical solutions of their force–displacement relations. This work extends the comprehensive properties and application prospects of gradient curved‐walled honeycombs and sets an example to develop plastic hinge analysis with effective simplification and desirable accuracy on complex‐shaped structures.

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Assembled mechanical metamaterials with transformable shape and auxeticity

Cited by 26 publications

References 76 publications

Experimental Study of Auxetic Structures Made of Re-Entrant (“Bow-Tie”) Cells

Experimental Study of Auxetic Structures Made of Re-Entrant (“Bow-Tie”) Cells

Auxetic hybrid metamaterial with tunable elastic wave bandgap

In‐Plane Crashworthiness of Gradient Curved‐Walled Honeycombs: Experimental, Numerical Simulation, and Theoretical Analysis

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