Design of a metamaterial film with excellent conformability and adhesion for bandage substrates

Wang, Haotian; Pan, Chen; Zhao, Haiyuan; Wang, Tingyu; Han, Yafeng

doi:10.1016/j.jmbbm.2021.104799

Cited by 8 publications

(7 citation statements)

References 30 publications

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“…Auxetic structures are modelled and fabricated in two general configurations, 2D thin sheet auxetics [31][32][33] and 3D auxetic lattice structures [28,34]. Elipe et al [35] presented a comprehensive study of 2D and 3D auxetic structures and compared the auxetic properties of different designs.…”

Section: Introductionmentioning

confidence: 99%

Design of a programmable particle filtering medium using a novel auxetic metamaterial

Ali

Abdi

Zahedi

et al. 2023

Smart Mater. Struct.

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This manuscript aims to design and develop a 2D auxetic filtering medium with programmable geometric features specifically designed to vary under in-plane tensile strain. This feature empowers the filtering medium to control the particles separation. A novel design and optimisation algorithm developed in Matlab® determines the final optimized geometry of the filtering medium based on the desired particle size input. Upon thorough numerical investigation, an empirical relationship between the linear elastic in-plane tensile strain and aperture size of the proposed metamaterial is revealed. This empirical relation can be used in mechatronic and control systems to steer the proposed filtering medium. A prototype of such filtering medium capable of classification of particles of size 4mm to 4.5mm, when subjected to linear strain, is fabricated through Fused Deposition Modelling (FDM) process. The developed geometry configurations in this research are scalable, providing a potential cost-effective and efficient solution for industrial applications including reconfigurable filtration and segregation systems.

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Section: Introductionmentioning

confidence: 99%

Design of a programmable particle filtering medium using a novel auxetic metamaterial

Ali

Abdi

Zahedi

et al. 2023

Smart Mater. Struct.

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“…In Figure 1(a) is presented a metamaterial conformed to a transtibial lower limb that could be used as a design for an in-socket pressure sensor or a socket with stress reduction (Barreto et al , 2022). Other in highly stretched joint areas, which require a tuned response in strain distribution [Figure 1(b)] such as pressure garments for scar therapy (Chow et al , 2022), pressure sensors (Loh et al , 2021) and medical bandages as explored by Wang et al (2021). The soft universal jamming gripper, proposed by Loh et al (2021) [Figure 1(c)], has a surface membrane with sensory capabilities and deforms around an object to be picked up.…”

Section: Introductionmentioning

confidence: 99%

“…This saves iterations of manufacturing and testing so that design changes are validated to tune desired mechanical properties (Duncan et al, 2018). FEA has also been used to validate experimental results of the elastic properties of additively manufactured structures (Alomarah et al, 2020a(Alomarah et al, , 2020bHu et al, 2020;Fongsamootr et al, 2022) and other nonconventional tests, like models of auxetic cellular domes under compressive loading (Easey et al, 2019) and functionally graded auxetic structures conformal to complex curved geometries (Naboni and Mirante, 2015;Vogiatzis et al, 2018), including the skin area to the human elbow that can replicate its movements (Han and Lu, 2018;Wang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…By introducing an auxetic cellular array, any flat non-stretchable material can be transformed into a conformable material (Yang et al , 2016), which can easily accommodate to any complex curved object, including the human body. In the area of wearable products, non-uniform auxetic topologies have been adapted for highly stretched joint areas, matching the deformation behavior of the target skin (Han and Lu, 2018; Loh et al , 2021; Wang et al , 2021). They also produce complex curvature adaptive structures that generate bending shells (Mizzi et al , 2020), even with rigid materials (Naboni et al , 2018) useful for architecture.…”

Section: Introductionmentioning

confidence: 99%

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Sine-based lattice plates: additive manufacturing and their mechanical properties when loaded out of plane

Ramírez-Gutiérrez

Cuan-Urquizo

Fuentes-Aguilar

2023

RPJ

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Purpose Demanding applications could benefit from the mathematical parametrization of lattice structures as this could lead not only to the characterization of structure–property relation but also facilitates the tailoring of the effective mechanical properties. This paper aims to characterize the mechanical performance of sine-based lattices. The characterization includes the results of in-plane Poisson’s ratio plates models, and the stiffness of additively manufactured lattice plates when loaded in the out-of-plane direction, with the objective of obtaining a relation with their geometrical parameters. Design/methodology/approach The geometrical parameter–Poisson’s ratio relationship was characterized via finite element (FE) simulations. The stiffness was also measured on additively manufactured polylactic acid lattice plates and contrasted with FE computations. Findings The characterization of auxetic lattice plates performed using in-plane and out-of-plane loading leads to key properties when deciding the geometry specific for applications: relative density, auxetic behavior and stiffness. Approximately 26% reduction of stiffness was observed between the square lattice and sine-based lattices of the same volume fraction. Originality/value Auxetic metamaterials are potential candidates for applications in biomedical engineering, smart sensors, sports and soft robotics. This paper aims to contribute to the existing gap in the study of auxetic metamaterials subjected to complex loading conditions, other than simple tension and compression, required for the mentioned applications.

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“…For example, the work presented by Wang et al wherein they proposed an adhesive and conformable film composed of rectangular cutout unit cells that can adapt to deformations of the skin surface. 13 In depth, metamaterials are structures made out of repeating patterns, patterns whose properties can be manipulated through design, to achieve a desired mechanical response. 14 Along with AM, these structures enable a wide use of polymer materials, thereby that allowing the fabrication of these metamaterials.…”

Section: Introductionmentioning

confidence: 99%

The use of conformal lattice metamaterials for relieving stress in lower limb sockets: A numerical and exploratory study

Barreto

Cuan-Urquizo

Perez‐Gonzalez

et al. 2022

Proc Inst Mech Eng H

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Selecting the correct material for each application has always been important. Now, with lattice metamaterials engineers can take advantage of the properties of these metamaterials to best suit a specific application. This paper investigates transtibial lower limb socket stress reduction through the implementation of conformal lattice metamaterials. In this work, a model was obtained with a 3D scanner from a plaster cast taken from a participant with a trans-tibial amputation. Then a 3D socket model was created and two conformal patterns were added to the surface of the socket using nTopology®. Parametric studies to relate the lattice metamaterials constituent elements to their effective structural properties, when such are loaded in-plane and out-of-plane were also included. Pressure test simulations were performed to determine the stresses produced in the sockets. This study concludes with discussion of the results and provides information on how surface conformal patterns can improve socket performance, showing that surface-vertex-centroid patterns increase stiffness and relieve stresses.

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Design of a metamaterial film with excellent conformability and adhesion for bandage substrates

Cited by 8 publications

References 30 publications

Design of a programmable particle filtering medium using a novel auxetic metamaterial

Design of a programmable particle filtering medium using a novel auxetic metamaterial

Sine-based lattice plates: additive manufacturing and their mechanical properties when loaded out of plane

The use of conformal lattice metamaterials for relieving stress in lower limb sockets: A numerical and exploratory study

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