Fabrication and Testing of Auxetic Foams for Rehabilitation Applications

Vinay, V. Chaithanya; Varma, D. S. Mohan

doi:10.1007/s41745-019-00122-y

Cited by 17 publications

(8 citation statements)

References 24 publications

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“…The auxetic materials expand in both axial and transverse directions when subjected to uniaxial strain . A typical behavior like this is reported in the literature for various materials such as microporous polymers, foams, polymer composites, metals, ceramics, and carbon, to name a few. Auxetic materials are known for their superior properties like improved shear resistance, hardness, flexibility, fracture resistance, and damping behavior. , There are many applications of auxetic materials, but they are highly sought after in aerospace, biomedical, or filtration applications because of their unique pore architecture. , Over the years, various auxetic structures ranging from molecular to macroscopic scale were reported.…”

Section: Introductionmentioning

confidence: 55%

Fabrication and Characterization of Re-Entrant Honeycomb Polyurethane Aerogels

Agrawal

Joo

Teo

et al. 2022

ACS Appl. Polym. Mater.

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In this work, polyurethane aerogels are fabricated in re-entrant honeycomb forms to achieve auxeticity and much higher flexibility than corresponding aerogel monoliths. For this purpose, a set of re-entrant honeycomb-shaped hollow molds is first printed from high-impact polystyrene (HIPS) using a fused filament fabrication technique and subsequently filled with polyurethane sol synthesized from an aliphatic triisocyanate and a diol selected from among butanediol, pentanediol, hexanediol, or octanediol. A sol–gel transition process yields the gel in a re-entrant honeycomb shape, which is isolated by dissolving the HIPS mold and supercritically dried using carbon dioxide. The effects of diol chain length on the properties of aerogels, such as bulk density, pore size, and tensile properties are investigated. The auxetic aerogels show different deformation behavior and much higher elongation at break than dogbone-shaped aerogel monoliths. Such unique properties of auxetic structures can extend applications of aerogels as acoustic absorbers and smart bandages that require high porosity, tunable pore structures, and high flexibility.

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Section: Introductionmentioning

confidence: 55%

Fabrication and Characterization of Re-Entrant Honeycomb Polyurethane Aerogels

Agrawal

Joo

Teo

et al. 2022

ACS Appl. Polym. Mater.

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“…In view of practical applications, especially for applications in EA, the final density is however indicated as a critical parameter [69,71,72]. A lower VCR appears to be preferable to maximize EA under quasistatic compression [73]. A VCR value of 2.2 was recommended as the best for PU foams used in seat cushions [71].…”

Section: Parametric Manufacturingmentioning

confidence: 99%

Manufacturing, characteristics and applications of auxetic foams: A state-of-the-art review

Jiang

Ren

Wang

et al. 2022

Composites Part B: Engineering

141

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“…Evans et al established the finite element model of 3D open‐cell foam and defined that re‐entrant cell shape exhibited NPR and then proposed hot‐compression method to fabricate re‐entrant auxetic foams . Subsequently, many researchers adopted the biaxial or triaxial hot‐compression method to fabricate auxetic polyurethane (PU) foam from conventional PU foam . The microstructures of conventional and auxetic PU foams are shown in Figure .…”

Section: Recent Advances In Ammsmentioning

confidence: 99%

“…The microstructures of conventional and auxetic PU foams are shown in Figure . Several experiments have been conducted to verify that the auxetic PU foam was stiffer than conventional PU foam at a larger strain and had better performance in damping and dynamic crushing performance . Li et al proposed a new near‐instantaneous method to fabricate auxetic PU foam in room temperature.…”

Section: Recent Advances In Ammsmentioning

confidence: 99%

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Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

et al. 2020

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Auxetic mechanical metamaterials (AMMs), as an exciting paradigm of metamaterials, have attracted increasing attention due to their interesting mechanical properties (e.g. negative Poisson's ratio), as well as the emergence of advanced manufacturing technology (e.g. 3D printing). Although various reviews on AMMs, their structures, properties, and applications, have existed, it still lacks a comprehensive review in terms of manufacturing methods. Herein, the latest progress in AMMs is extensively reviewed, including AMMs' structures, characteristics, manufacturing methods, and applications. In addition, the current challenges and future works of AMMs are concluded and discussed. This Review aims to serve as a collection of knowledge that supplies more comprehensive understanding and inspiration to support further developments of AMMs from the perspective of design and manufacturing.

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Fabrication and Testing of Auxetic Foams for Rehabilitation Applications

Cited by 17 publications

References 24 publications

Fabrication and Characterization of Re-Entrant Honeycomb Polyurethane Aerogels

Fabrication and Characterization of Re-Entrant Honeycomb Polyurethane Aerogels

Manufacturing, characteristics and applications of auxetic foams: A state-of-the-art review

Progress in Auxetic Mechanical Metamaterials: Structures, Characteristics, Manufacturing Methods, and Applications

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