Highly Stretchable Bilayer Lattice Structures That Elongate via In‐Plane Deformation

Yiming, Burebi; Wu, Lei; Zhang, Mingqi; Han, Zilong; Zhao, Pei; Li, Tiefeng; Jia, Zheng; Qu, Shaoxing

doi:10.1002/adfm.201909473

Cited by 5 publications

(3 citation statements)

References 49 publications

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“…[19,23] Architected materials, on the other hand, are designed by altering the local geometry to control the mechanical properties, leading to superior stretchability. [24][25][26][27][28] Researchers have successfully demonstrated stretchability up to 360% using a 3D-printed bilayer lattice and up to 230% using bio-mimetic 3D network materials. [24] A metal-based network material with rotatable structural lattice nodes demonstrated stretchability in the range of 50-220%.…”

Section: Introductionmentioning

confidence: 99%

“…[24][25][26][27][28] Researchers have successfully demonstrated stretchability up to 360% using a 3D-printed bilayer lattice and up to 230% using bio-mimetic 3D network materials. [24] A metal-based network material with rotatable structural lattice nodes demonstrated stretchability in the range of 50-220%. [29] A bio-mimetic 3D network material with periodic geometries of helical microstructures and lattice topologies was shown to stretch to more than 230%.…”

Section: Introductionmentioning

confidence: 99%

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Greek Key Inspired Fractal Metamaterials with Superior Stretchability for Tunable Wave Propagation

Zhang,

Jiang,

Bednarcyk

et al. 2023

Adv Materials Technologies

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Stretchable materials that can sustain a large deformation are in high demand, because they find broad applications ranging from stretchable energy storage devices to tunable noise and vibration devices. One main challenge is creating strain‐releasing mechanisms from inherently brittle materials. This work explores a new approach to designing stretchable metamaterials, using a "kerfing" pattern inspired by the ancient Greek Key configuration. The kerfing architecture allows for substantial in‐plane elongation. In‐plane tensile experiments show an ≈8‐times increase in stretchability when the kerfing width is enlarged four times. With higher‐order fractal patterns, the fractal lattice exhibits a stretchability of up to ≈520%, far beyond the inherent deformability of the brittle constituent. Moreover, this design also enables the tunability of various mechanical properties, including stiffness, strength, toughness, and Poisson's ratio. Ashby‐type plots are presented, revealing the relationships between stretchability and other mechanical properties to aid in the design and fabrication of advanced engineering materials. To demonstrate a vital application of the achieved stretchability, elastic wave propagation in the proposed kerfing metamaterials is studied. Simulations indicate that multiple broad phononic bandgaps arise in these structures as the fractal order increases. These bandgaps prove to be adjustable not only through the fractal lattice geometry but also by means of applied mechanical loading. This investigation highlights the potential of fractal‐based layouts as a promising avenue for designing cutting‐edge stretchable metamaterials with customizable mechanical properties and functionalities.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Greek Key Inspired Fractal Metamaterials with Superior Stretchability for Tunable Wave Propagation

Zhang,

Jiang,

Bednarcyk

et al. 2023

Adv Materials Technologies

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show abstract

“…Another critical property of lattice structure is high stretchability (Jiang and Wang, 2016;Yiming et al, 2020). Inspired by the non-mineralized soft materials typically constructed from wavy constituents embedded in soft matrices, curved microstructures are commonly used to design lattices (Ma et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Design of Shape Reconfigurable, Highly Stretchable Honeycomb Lattice With Tunable Poisson’s Ratio

et al. 2021

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The mechanical behaviors of lattice structures can be tuned by arranging or adjusting their geometric parameters. Once fabricated, the lattice’s mechanical behavior is generally fixed and cannot adapt to environmental change. In this paper, we developed a shape reconfigurable, highly stretchable lattice structure with tunable Poisson’s ratio. The lattice is built based on a hexagonal honeycomb structure. By replacing the straight beam with curled microstructure, the stretchability of the lattice is significantly improved. The Poisson’s ratio is adjusted using a geometric angle. The lattice is 3D printed using a shape memory polymer. Using its shape memory effect, the lattice demonstrates tunable shape reconfigurability as the ambient temperature changes. To capture its high stretchability, tunable Poisson’s ratio and shape reconfigurability, a phase evolution model for lattice structure is used. In the theoretical model, the effects of temperature on the material’s nonlinearity and geometric nonlinearity due to the lattice structure are assumed to be decoupled. The theoretical shape change agrees well with the Finite element results, while the theoretical model significantly reduces the computational cost. Numerical results show that the geometrical parameters and the ambient temperature can be manipulated to transform the lattice into target shapes with varying Poisson’s ratios. This work provides a design method for the 3D printed lattice structures and has potential applications in flexible electronics, soft robotics, and biomedicine.

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PLA Double‐Spirals Offering Enhanced Spatial Extensibility

Jafarpour,

Gorb

2024

Macro Materials & Eng

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Inspired by natural spiral curves, this study aims to present a strategy to find a compromise between extensibility and load‐bearing capacity in structures made from polylactic acid (PLA) as a brittle material. Herein, four geometrically distinct double‐spiral modules are fabricated using a three‐dimensional (3D) printer and subjected to tension, in‐plane sliding, and out‐of‐plane sliding to assess both their in‐plane and out‐of‐plane mechanical performance. Subsequently, a modular spiral‐based metastructure is developed and tested under tension in two different directions. The results show that the maximum extension of the modules under different loading scenarios varies from 9 to 86 mm, while their load‐bearing capacity ranges between 18 and 78 N. These significant variations highlight the considerable influence of both geometry and loading conditions on the mechanical behavior of the double‐spiral modules. Moreover, the 250% horizontal and 130% vertical extensibility of the metastructure emphasize the importance of the spatial orientation of the modules in determining the efficiency of spiral‐based metastructures. This study suggests that double‐spirals with adjustable mechanical properties, if designed rationally, can offer a promising strategy to address the limited deformability of materials like PLA, and when arranged in specific spatial configurations, they can contribute to the development of energy‐dissipative metastructures with enhanced extensibility.

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Highly Stretchable Bilayer Lattice Structures That Elongate via In‐Plane Deformation

Cited by 5 publications

References 49 publications

Greek Key Inspired Fractal Metamaterials with Superior Stretchability for Tunable Wave Propagation

Greek Key Inspired Fractal Metamaterials with Superior Stretchability for Tunable Wave Propagation

Design of Shape Reconfigurable, Highly Stretchable Honeycomb Lattice With Tunable Poisson’s Ratio

PLA Double‐Spirals Offering Enhanced Spatial Extensibility

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