Tensegrity Metamaterials: Tensegrity Metamaterials: Toward Failure‐Resistant Engineering Systems through Delocalized Deformation (Adv. Mater. 10/2021)

Bauer, J.; Kraus, Julie A.; Crook, Cameron; Rimoli, Julián J.; Valdevit, Lorenzo

doi:10.1002/adma.202170077

Cited by 6 publications

(9 citation statements)

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“…For a perfect multifunctional load-bearing and energy-absorbing systems, the specific strength, SEA, and CFE should be as high as possible, while the initial peak stress should be as low as possible. [23,47] The research community has long been struggling with the tradeoff relations between these four properties, including increasing the energy-absorbing capacity and strength at the expense of structural stability, achieving high energy absorption, but at the same time suffering from the obstinate issue of high initial peak stress which is usually larger than the plateau stress. The proposed MHCFCC lattice metamaterial overcomes this challenge by simultaneously introducing the two bionic features of double diagonal reinforcement and hierarchical circular modification.…”

Section: Quasistatic Compressionmentioning

confidence: 99%

“…This instability, brought about by localized deformations such as buckling, cracking, and the formation of shear bands, leads to an obvious negative stiffness and a highly oscillatory stress-strain response. [23] To date, overcoming catastrophic failure and the instability of the stress response remains a major challenge in the design of lattice metamaterials. Additionally, existing researchs on lattice metamaterials were primarily focused on uniaxial tension and compression, [24] without adequate assessment of their bending performance.…”

Section: Introductionmentioning

confidence: 99%

“…However, these advantages come with the tradeoff of lower stress levels. Previous studies[10,23] have demonstrated that the delocalized deformation results in a stable stress response, yet most stretch-dominated lattice metamaterials tend to display localized shear bands, rather than delocalized deformation, leading to structural instability, and catastrophic collapse. To overcome this challenge, the HCFCC and MHCFCC lattice metamaterials were derived from the traditional stretch-dominated FCC lattice by replacing the straight edge struts with hierarchical circular struts.…”

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confidence: 99%

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Breaking the Tradeoffs between Different Mechanical Properties in Bioinspired Hierarchical Lattice Metamaterials

Wang,

Yang,

Zheng

et al. 2023

Adv Funct Materials

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It is a long‐standing challenge to break the tradeoffs between different mechanical property indicators such as the strength versus toughness in the design of lightweight lattice materials. To tackle this challenge, a hierarchical lattice metamaterial with modified face‐centered cubic (FCC) cell configuration, inspired by the glass sponge skeletal system, is proposed. The proposed lattice metamaterial simultaneously possesses high strength, high energy absorption, considerable toughness, as well as controllable deformation patterns through integration of both bionic features of double diagonal reinforcement and hierarchical circular modification. The compressive strength and energy absorption can reach 69.13 MPa and 53.39 J cm3, respectively. Furthermore, the proposed lattice also exhibits exceptionally high damage tolerance compared with existing lattice metamaterials with comparable strength by attenuating stress and deformation concentration that may cause catastrophic collapse. This design approach combines the advantages of tensile‐dominated and bending‐dominated lattices. Quantitatively, in terms of specific strength, specific energy absorption, and crushing force efficiency, the modified hierarchical circular FCC (MHCFCC) lattice metamaterial outperforms the Octet lattice by 14.85%, 53.28%, and 110.52%, respectively. This multibionic feature integration approach provides advanced design strategies for high‐performance architected metamaterials with promising application potential.

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Section: Quasistatic Compressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Breaking the Tradeoffs between Different Mechanical Properties in Bioinspired Hierarchical Lattice Metamaterials

Wang,

Yang,

Zheng

et al. 2023

Adv Funct Materials

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“…[ 30 ] We can compare the specific energy absorption (SEA) of the designs, which is defined as the area under the stress–strain curve up until the densification strain normalized by the density. [ 31 ] Design A has the highest SEA at 12 J kg −1 , Design B is 8 J kg −1 , and Design C is 6 J kg −1 . The maximum efficiency of each design is the same, which means that the difference in SEA is due solely the strength of the design.…”

Section: Structures With Tailored Local Porositymentioning

confidence: 99%

Controlled In Situ Foaming for Mechanical Responsiveness of Architected Foams

Golobic,

Bryson,

Weisgraber

et al. 2023

Adv Eng Mater

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Addition of chemical blowing agents to polysiloxane resins produces foams with closed‐cell morphology. Combining this chemistry with the 3D‐printing technique Direct Ink Writing (DIW) permits the creation of architected foams with controllable, hierarchical tiers of porosity. Using a two‐component foaming ink, the extent of foaming can be controlled by incorporating an active mixing printhead as part of the fabrication process. Changes in the mixing speed allows for in‐situ control of the foaming reaction where the mixing speed is directly correlated with the resulting foaming that occurs upon extrusion. These architected foams display tunable mechanical responses, porosities, and open‐to‐closed cell ratios. While chemically blown polysiloxane foam is a well‐established material, utilizing DIW as fabrication technique presents a novel approach for creating tailored, architected foams that require minimal post‐processing.This article is protected by copyright. All rights reserved.

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“…[40,41] The fixed fracture region can be also programmed by designing the configurations of cell structure. [42,43] In a word, the main results from these works deepen the understanding of the potential of programing the mechanical performance and deformation of lattice structures via designing lattice configuration.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characteristics of Architected Polycrystal Lattice Affected by the Orientation of Metagrain Boundary

Chen

Cui

et al. 2023

Adv Eng Mater

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The orientation of internal metagrain boundary shows an important influence on shearing behaviors and mechanical performance of architected polycrystal lattice. This study designs four types of architected polycrystal lattices equipped with single boundary, multiple parallel boundaries, or multiple intersecting boundaries, with boundary orientations of 0°, 26.55°, 45°, 63.45°, or 90°. The compressive responses of these architected polycrystal lattices are investigated to reveal the effects of the boundary orientations. Especially the relations between the shearing deformation and the boundary orientation are clarified, and the underlying shearing mechanisms are discussed to provide a basis for predicting and explaining the energy absorbing capacity in the architected polycrystal lattice. For the architected polycrystal lattice consisting of +30° and −30° orientated metagrains with intrinsic shear bands of 60° and 75°, the 75° rather than 60° shear band is more likely to occur when the angle of the architected polycrystal boundary increases from 0° to 90°. Most importantly, the higher energy absorption prefers the shear band more horizontal and shorter, which can be realized by increasing the angle and the number of grain boundaries. This contributes to resisting catastrophic failure for lattice structures. These findings provide guidance for developing novel lattice structures with well‐controlled mechanical characteristics.

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Tensegrity Metamaterials: Tensegrity Metamaterials: Toward Failure‐Resistant Engineering Systems through Delocalized Deformation (Adv. Mater. 10/2021)

Cited by 6 publications

References 0 publications

Breaking the Tradeoffs between Different Mechanical Properties in Bioinspired Hierarchical Lattice Metamaterials

Breaking the Tradeoffs between Different Mechanical Properties in Bioinspired Hierarchical Lattice Metamaterials

Controlled In Situ Foaming for Mechanical Responsiveness of Architected Foams

Mechanical Characteristics of Architected Polycrystal Lattice Affected by the Orientation of Metagrain Boundary

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