Auxetic elastomers: Mechanically programmable meta-elastomers with an unusual Poisson’s ratio overcome the gauge limit of a capacitive type strain sensor

Lee, Youngjoo; Lim, Soo-Jeong; Yi, Seol-Min; Lee, Jehee; Kang, Sung-Gyu; Choi, Gwang-Mook; Han, Heung Nam; Sun, Jeong‐Yun; Choi, In‐Suk; Joo, Young‐Chang

doi:10.1016/j.eml.2019.100516

Cited by 54 publications

(22 citation statements)

References 30 publications

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“…Due to the remarkable comprehensive mechanical properties, more researchers turned their attention to composite AMMs, such as carbon fiber-reinforced composites [172] and metallic composites with flexible fillers. [173,174] It has been proved that aluminum-based composite AMMs with polymer fillers have 3D chiral VerWhitePlus [44] TangoBlackPlus FLX980 [52] FullCure850 VeroGray [124] VeroBlue RGD840 [39] 2D re-entrant VeroWhite and TangoPlus [125] VeroWhite and DM9760 [59] 3D re-entrant VeroWhitePlus and TangoBlackPlus [126] Missing ribs VeroWhite and TangoPlus [38] Other TangoPlus [106] FDM 2D/3D chiral PLA [127] 2D re-entrant PLA [128] SLA 2D chiral Tough resin [129] 3D chiral Photosensitive resin [45] 2D [30,40] 2D re-entrant TPU [138] Perforation Lexan polycarbonate sheet [139] Aluminum alloy T6061 [140] Other manufacturing methods Mold casting 2D re-entrant PDMS [141] Other (porous structure) Silicone rubber [104,105,142] Vacuum-casting technique 2D chiral 8040 two-part resin [143] Molding forming and assembly 2D chiral Carbon fiber-/glass fiber-reinforced composite [144][145][146] Aluminum alloy T6061-T051, carbon fiber epoxy composite [147] Assembly 2D chiral Bimetallic strips [148] Ni 48 Ti 46 Cu 6 [149] 3D re-entrant Carbon fiber-reinforced polymer [70] Assembly and laser welding 3D re-entrant Steel ST13 [65] Hot compression/ triaxial hot compression Auxetic foam PU foam [94][95]…”

Section: Other Manufacturing Methodsmentioning

confidence: 99%

“…In terms of designing strain sensors based on the capacitive sensing principle, Lee et al [138] introduced auxetic elastomers into designing capacitive strain sensors that achieved the improvement of gauge factor. The schematic diagram is shown in Figure 21d.…”

Section: Strain Sensors Based On Auxeticsmentioning

confidence: 99%

Section: Auxetic Actuatorsmentioning

confidence: 99%

Section: Applications Of 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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Section: Other Manufacturing Methodsmentioning

confidence: 99%

Section: Strain Sensors Based On Auxeticsmentioning

confidence: 99%

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

et al. 2020

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“…Bulk modified PDMS composites can be created by embedding nanoparticles. Lee et al (2019) were introduced the concept of a metamaterial elastomer. This is elastomer having programmable elastic properties of Poisson’s ratio that are beyond their conventional ranges and include in-plane negative and out-of-plane positive Poisson’s ratios.…”

Section: Introductionmentioning

confidence: 99%

Mechanical meta-material-based polymer skin graft production by rapid prototyping and replica method

Attar

Aydin

Arabacı

et al. 2020

RPJ

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Purpose The purpose of this paper is the production of mechanical meta-material samples by rapid prototyping (RP) and replica technique for patient-specific skin graft or cranial implant applications in tissue engineering. Design/methodology/approach Positive moulds (patterns) were produced by stereolithography-based RP. Impression moulding method was used for the production of silicone products (skin grafts). Alginate was used as a moulding material (negative mould). Room temperature vulcanising silicone was poured into the cavity of alginate mould and then products were produced. TiO2 powder and carbon fibres were used as reinforcement. Meta-material structured polyurethane reinforced silicone composites were also produced. Liquid components (diisocyanate and polyol) were poured into the mould and then polyurethane was produced. Then, polyurethane was immersed in the liquid silicone. Findings It is found that non-destructive ultrasonic test is a fast and reliable method. Meta-material-based composites show dome-shaped tensile/synclastic surface properties which are important for the skin graft and cranial implants. Increasing the amounts of cross-linking agent and TiO2 particles increased the hardness and elastic modulus. Carbon fibre addition enhanced the elastic modulus. Originality/value Although there are studies on the meta-materials, there is limited study on the RP of the meta-materials for patient-specific implants (skin grafts). Auxetic surface shows perfect fit to curved surface of the skull. Although there are studies on the silicone and polyurethane composites, there is limited study on the characterisation of mechanical properties by ultrasonic tests and strain gauge analysis.

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Novel Linear, Piezoresistive, Auxetic Sensors Coated by AAA Battery Active Carbons with Supreme Sensitivity for Human Body Movement Detection

Taherkhani,

Bodaghi,

Rahmani

et al. 2023

Adv Eng Mater

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Herein, a novel strategy for creating low‐cost, sustainable, piezoresistive auxetic sensors using the active carbon in consumed AAA batteries, promoting a circular economy, is presented. An auxetic structure with a fixed Poisson's ratio during the strain is designed for sensing. The sensor substrate is silicone RTV2, and the sensing element is the active carbon in AAA batteries chopped to microscale particles using an ultrasonic wave. The sensor mold is designed using Solidworks software and produced using a computer numerical control device and EdgeCam2014 software. The coating process is performed by spraying the prepared particles on the molded auxetic structure and putting the coated auxetic structure under ultraviolet ray to prepare the final sensor. Sensitivity tests are performed, and the results show that the proposed sensor has a better sensitivity of about 1000% and 410% than the previous mixed and layered composite auxetic counterparts. The proposed sensor has linear sensitivity during the strain (estimated with a line with a slope of 0.64) while previous ones have a nonlinear performance (estimated at least with two lines). The sustainable sensor is implemented to detect the movements of the human body, including the movements of the wrist, finger, elbow, and forearm.

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Auxetic elastomers: Mechanically programmable meta-elastomers with an unusual Poisson’s ratio overcome the gauge limit of a capacitive type strain sensor

Cited by 54 publications

References 30 publications

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

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

Mechanical meta-material-based polymer skin graft production by rapid prototyping and replica method

Novel Linear, Piezoresistive, Auxetic Sensors Coated by AAA Battery Active Carbons with Supreme Sensitivity for Human Body Movement Detection

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