In-plane elastic properties of a novel re-entrant auxetic honeycomb with zigzag inclined ligaments

Zhu, Yilin; Luo, Yi; Gao, Defeng; Yu, Chao; Ren, Xin; Zhang, Chuanzeng

doi:10.1016/j.engstruct.2022.114788

Cited by 63 publications

(10 citation statements)

References 84 publications

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“…These unit cell designs range from common material structures to ones that exist on the molecular level, as seen in some inorganic microstructure crystals [5]. There are different geometries that provide negative Poisson's ratio property, such as the S-shaped unit cell, which was explored by Meena, K. and Singamneni, S., 2019 [4] and the re-entrant unit cell, which was explored by Y. Zhu et al, 2022 [6]. A major challenge of unit cell design is the complexity of the detailed design relative to the load capacity that the structure can handle [3].…”

Section: Geometric Designsmentioning

confidence: 99%

Auxetics in Biomedical Applications: A Review

Rose¹,

Siu²,

Zhu³

et al. 2023

JMMCE

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Materials exhibiting auxetic properties have a negative Poisson's ratio, which intrigued researchers to understand the behavior of auxetic structure. Several researchers focused on the different auxetic cell designs, while others focused on the auxetic applications. With the advance of additive manufacturing methods, computer-aided design and finite element analysis in recent decades, auxetics have been explored. One of the interesting applications is in the field of biomedical devices or implants, especially for certain natural biomedical organs such as tissues, certain ligaments that have auxetic properties. This paper is an overview of auxetic design approaches and biomedical applications.

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Section: Geometric Designsmentioning

confidence: 99%

Auxetics in Biomedical Applications: A Review

Rose¹,

Siu²,

Zhu³

et al. 2023

JMMCE

View full text Add to dashboard Cite

show abstract

“…Most notably, re-entrant auxetic honeycombs exhibit a negative Poisson's ratio; this unique attribute denotes that these structures, when subjected to uniaxial tension, expand in the orthogonal direction, rather than exhibiting the conventional contraction. This counterintuitive behaviour renders them exceptionally suited for applications requiring enhanced protection, such as materials designed to resist impact forces [59][60][61]. The four characteristic honeycomb structures under investigation each serve unique functions within their respective domains, thus reinforcing the value in examining the alterations in their mechanical properties under hypergravity conditions.…”

Section: (C) Honeycomb Configurationmentioning

confidence: 99%

Equivalent in-plane elastic moduli of honeycomb materials under hypergravity conditions

Wang,

Lü

2023

Proc. R. Soc. A.

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Honeycomb materials frequently encounter hypergravity conditions in both aerospace and biological contexts during phases such as launch, reentry or under centrifugal motion. The significant body force engendered by hypergravity induces alterations in the microstructure of honeycomb materials, which in turn, influences their macroscopic mechanical behaviour. Leveraging the stiffness of the beam element as a pivotal variable, we successfully derived the equivalent moduli of the honeycomb material under hypergravity conditions. We further proposed the concept of a ‘hypergravity factor’, elucidating that the density of the base material, the dimensions of honeycomb cells and the magnitude of the hypergravity contribute to amplifying hypergravity effects. The results, numerically validated through finite-element simulations, could be reduced to the case that neglects body force. The critical buckling load of the honeycomb material under hypergravity can be assessed by setting the derived moduli to zero. In the presence of hypergravity, a honeycomb material undergoes a transition into a gradient material along the hypergravity direction, thereby exacerbating anisotropy. This phenomenon is theoretically expected to occur in virtually all porous materials. The analytical framework adopted, which employs beam stiffness as an intermediary variable, facilitates the extension of these results to honeycomb materials which encompass beam elements with functional gradients or varying cross-sectional morphologies.

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“…The results indicated that the thick‐walled honeycomb showed V, Y, and X deformation modes, and the thin‐walled honeycomb showed horizontal Bi‐V and Z deformation modes. Zhu et al [ 22 ] proposed a new 2D re‐entrant auxetic honeycomb metamaterial by introducing zigzag inclined ligaments. The new honeycomb enhances the stiffness of the (2D) re‐entrant honeycomb without compromising the conjugated auxeticity.…”

Section: Introductionmentioning

confidence: 99%

Enhancement Design and Quasi‐Static Crushing Response of Novel Star‐Rhombus Honeycombs

Wang

Liu

2023

Physica Status Solidi (b)

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To enhance the load‐bearing capacity and energy absorption capacity of the honeycomb, three kinds of star‐rhombus honeycombs (SRHs) are proposed by adding rhombic parts to the traditional star‐shaped honeycomb (TSH). The quasi‐static crushing responses of SRHs, including deformation mechanism, crushing stress, specific energy absorption (SEA), and Poisson's ratio, are studied based on the finite‐element (FE) method. The introduction of rhombic parts increases the number of plastic hinges, resulting in significantly higher crushing stress and SEA of the SRHs than that of the TSH. Among the SRHs, SRH‐A has the largest energy absorption, and the SEA value of SRH‐A is 98.2% higher than TSH. Then, parametric studies including wall thickness, cell wall angle, and spacing length between the vertices of the star‐shaped part and the rhombic part are carried out. The wall thickness and cell wall angle have the greatest influence on the crushing response of SRHs. Crushing stress and Poisson's ratio of SRHs can be adjusted by changing the wall thickness of the rhombic part. The configurations and geometric parameters of the rhombic part determine the Poisson's ratio of SRHs. This study provides effective guidance for designing star‐shaped honeycombs with enhanced load‐bearing capacity and energy absorption capacity.

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In-plane elastic properties of a novel re-entrant auxetic honeycomb with zigzag inclined ligaments

Cited by 63 publications

References 84 publications

Auxetics in Biomedical Applications: A Review

Auxetics in Biomedical Applications: A Review

Equivalent in-plane elastic moduli of honeycomb materials under hypergravity conditions

Enhancement Design and Quasi‐Static Crushing Response of Novel Star‐Rhombus Honeycombs

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