Mechanical property of anti-trichiral honeycombs under large deformation along the x-direction

Hu, Lingling; Ye, W.K.; Wu, Zhenqian

doi:10.1016/j.tws.2019.106415

Cited by 20 publications

(9 citation statements)

References 26 publications

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“…[ 26 ] In addition to tailoring microstructure, it was recently found that the value of Poisson's ratio is also dependent on the extent of material deformation. [ 12 ] For instance, at large strains the microstructure deforms in a mechanically nonlinear regime, resulting in strain‐dependent auxetic behavior. [ 12 ] To maximize auxetic response, Chen and Zheng [ 27 ] proposed multi‐material metamaterials with spatially varying stiffness to induce a Poisson's ratio ranging from ‐7 to 0 when subjected to tensile strain up to 20%.…”

Section: Metamaterials Static and Dynamic Behaviorsmentioning

confidence: 99%

“…[ 12 ] For instance, at large strains the microstructure deforms in a mechanically nonlinear regime, resulting in strain‐dependent auxetic behavior. [ 12 ] To maximize auxetic response, Chen and Zheng [ 27 ] proposed multi‐material metamaterials with spatially varying stiffness to induce a Poisson's ratio ranging from ‐7 to 0 when subjected to tensile strain up to 20%. Two main deformation mechanisms that lead to auxetic behavior are: i) rotation of unit cell microstructure upon uniaxial or biaxial metamaterial deformation and ii) unit cells with re‐entrant shape.…”

Section: Metamaterials Static and Dynamic Behaviorsmentioning

confidence: 99%

“…Figure a) schematically illustrates two examples of structures, made of periodic arrangement of trihexagonal [ ] and square voids. [ 8 ] These exemplary auxetics transition between porous shapes, Figure 1a) label A, to a deformed solid geometry, Figure 1a) label C. A wide variety of auxetic structures are explored for mechanical metamaterials including re‐entrant units, [ 9,10 ] chiral structures, [ 11,12,13 ] bow‐tie elements, [ 14 ] star shaped perforations, [ 15,16 ] circular void patterns, [ 17 ] perforations with ancient geometric motifs, [ 18 ] sinusoidally architected beams, [ 19 ] and origami inspired patterns such as Miura‐ori. [ 20 ]…”

Section: Metamaterials Static and Dynamic Behaviorsmentioning

confidence: 99%

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Foundations for Soft, Smart Matter by Active Mechanical Metamaterials

Pishvar

Harne

2020

Advanced Science

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Emerging interest to synthesize active, engineered matter suggests a future where smart material systems and structures operate autonomously around people, serving diverse roles in engineering, medical, and scientific applications. Similar to biological organisms, a realization of active, engineered matter necessitates functionality culminating from a combination of sensory and control mechanisms in a versatile material frame. Recently, metamaterial platforms with integrated sensing and control have been exploited, so that outstanding non‐natural material behaviors are empowered by synergistic microstructures and controlled by smart materials and systems. This emerging body of science around active mechanical metamaterials offers a first glimpse at future foundations for autonomous engineered systems referred to here as soft, smart matter. Using natural inspirations, synergy across disciplines, and exploiting multiple length scales as well as multiple physics, researchers are devising compelling exemplars of actively controlled metamaterials, inspiring concepts for autonomous engineered matter. While scientific breakthroughs multiply in these fields, future technical challenges remain to be overcome to fulfill the vision of soft, smart matter. This Review surveys the intrinsically multidisciplinary body of science targeted to realize soft, smart matter via innovations in active mechanical metamaterials and proposes ongoing research targets that may deliver the promise of autonomous, engineered matter to full fruition.

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Section: Metamaterials Static and Dynamic Behaviorsmentioning

confidence: 99%

Section: Metamaterials Static and Dynamic Behaviorsmentioning

confidence: 99%

Section: Metamaterials Static and Dynamic Behaviorsmentioning

confidence: 99%

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Foundations for Soft, Smart Matter by Active Mechanical Metamaterials

Pishvar

Harne

2020

Advanced Science

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“…Honeycombs have been applied universally in many elds, such as the military, aerospace, mechanical engineering, and the automobile industries, owing to their high strength and energy absorbing properties [1][2][3][4][5][6][7][8][9]. Many studies [10][11][12][13] have shown that a honeycomb with a negative Poisson's ratio e ect can exhibit more unique deformation behaviors and higher shear capacities and fracture resistance compared to conventional honeycombs under dynamic crushing.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Crushing Analysis of Hexagonal-Kagome Combined Honeycomb with Negative Poisson’s Ratio

Wang

Yang

Jun

2022

Advances in Materials Science and Engineering

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To enhance the mechanical performances of traditional honeycombs, a novel combined honeycomb (HKH) was proposed based on the regular hexagonal honeycomb (RHH) and Kagome honeycomb (KH). A systematic investigation of the in-plane dynamic crushing behaviors of the honeycombs was conducted via the finite element method, and the crashworthiness characteristics of the three honeycombs were examined. Using one-dimensional shock wave theory and least squares fitting, a fitting formula of the plateau stress was obtained, and the deformation mechanism of the HKH was determined based on the elastic buckling of the cell wall. The results showed that the HKH exhibited a higher plateau stress than the RHH for any velocity impact, while the negative Poisson’s ratio effect was more significant than that of the KH for low-velocity impacts (the peak Poisson’s ratios of the HKH and KH were −0.312 and −0.286, respectively). Furthermore, the effects of the impact velocity and relative density on the energy absorption and auxetic performances were explored. In this study, a novel design was proposed by combining various cell elements to obtain better crashworthiness, providing a new concept to promote the development of lightweight materials.

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“…[ 1 ] They exhibit unique properties related to Poisson's ratio, possessing a high shear modulus, high hardness, high indentation resistance, and sound absorption. [ 2 ] Generally, auxetics are natural materials, including molecular auxetics [ 3–5 ] and auxetic biomaterials, [ 6–8 ] or artificially synthesized such as re‐entrant honeycomb auxetics, [ 9–11 ] re‐entrant foam, [ 12,13 ] microporous polymers, [ 14 ] chiral honeycomb auxetics, [ 15–17 ] and fibrous auxetics. [ 18,19 ]…”

Section: Introductionmentioning

confidence: 99%

In Situ X‐Ray Tomography of Sintered Metal Fiber Felts Exhibiting Auxetic Effect under Tension and Compression

Wang

et al. 2022

Adv Eng Mater

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Sintered metal fiber felts (SMFFs) are kinds of the strongest auxetic materials to date, but there are significant differences in the reported auxeticities, due to the lack of investigation on the fabrication process. This study is performed to analyze the influence of fabrication process and structural features on the auxetic effect exhibited by SMFFs. The sequence of compression and sintering processes determines the volume density of the interfiber‐sintered joints and the resulting Poisson's ratio behavior under tension and compression. The SMFFs with a low volume density exhibit strong auxetic effect under tension and achiev a positive Poisson's ratio under compression because of the weak interfiber layer bonding. In contrast, the felts with a high density of interfiber joints reveal a relatively weak auxetic effect under both tension and compression. Moreover, an increase in the thickness and a decrease in the porosity reduce the auxetic effect. In addition, in situ X‐Ray tomography of the tensile testing is performed to elucidate the mechanism of the auxetic effect. To explain the observed Poisson's ratio behavior under tension and compression, periodical finite‐element modeling with real mesostructures is performed. Herein, a new insight into the relationship between the structure features and the Poisson's ratio behaviors is given.

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Mechanical property of anti-trichiral honeycombs under large deformation along the x-direction

Cited by 20 publications

References 26 publications

Foundations for Soft, Smart Matter by Active Mechanical Metamaterials

Foundations for Soft, Smart Matter by Active Mechanical Metamaterials

Dynamic Crushing Analysis of Hexagonal-Kagome Combined Honeycomb with Negative Poisson’s Ratio

In Situ X‐Ray Tomography of Sintered Metal Fiber Felts Exhibiting Auxetic Effect under Tension and Compression

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