Tensile and Deformation Behavior of Auxetic Plied Yarns

Ng, Wing Sum; Hu, Hong

doi:10.1002/pssb.201600790

Cited by 27 publications

(36 citation statements)

References 29 publications

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“…Researchers worked on yarns with more plies, and these yarns exhibited auxetic effect as well. [19,24,25] However, the engineering design of the helical yarns for auxeticity and the setting of machine parameters call for further investigation.…”

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Manufacture and Evaluation of Auxetic Yarns and Woven Fabrics

Gao

Liu

et al. 2020

Physica Status Solidi (b)

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Auxetic materials expand in the transverse direction under tensile loading in the longitudinal direction, or contract when compressed, in contrast to the conventional materials. [1] Negative Poisson's ratio (NPR) was reported in natural materials by Viogt in the late 19th century. [2] Evans et al. advised that NPR structures and materials could be renamed as "auxetics" for convenience from the Greek word "auxetos." [3] The auxetic characteristics have been reported on fundamental theory in 1989, [4] and different structures including re-entrant structure, [5] folded structure, [6] and honeycomb structure. [7,8] Also, many auxetic materials have been discovered up to date. Iron pyrites were found auxetic with the Poisson's ratio of À0.14, [9] polyurethane foams were reported for a NPR value of À0.7, [5] and warp-knitted and weft-knitted fabrics were found to demonstrate NPR effect too. [10,11] Alderson and Evans experimented on microporous ultrahigh molecular-weight polyethylene (UHMWPE) and found the Poisson's ratio ranged between 0 and À1.24. [12] There are two general approaches for making auxetic textiles. The first one is using the conventional yarns with specially designed fabric structures, such as the reentrant structures and rotating structures for knitted fabrics [13] and bistretch auxetic woven fabrics with re-entrant hexagonal geometry. [14] The other approach is to use auxetic yarns directly to make fabrics. Some researchers produced auxetic woven fabrics using double helix yarns, and their studies showed that such fabrics demonstrated the some level of auxeticity and increased porosity. [15,16] An out-of-register double helical yarns were used to produce double-pick woven fabrics by Miller et al. [17] which showed that the two-layer fabric assembly had the auxetic effect with the Poisson's ratio to be À0.1. In addition, Hu and coworkers [18,19] created an auxetic yarn with a fourply structure with the Poisson's ratio of about À2.0, and it was used to make woven auxetic fabrics which demonstrated much smaller auxeticity. It has to be said that despite the progress in making fabrics from auxetic yarns, the responses of the fabrics under tensile loading need further clarification. High modulus fibers together with an elastic core element are the most commonly used materials for manufacturing auxetic yarns. Helical auxetic yarns (HAYs) are one type of the most promising yarns for exploitation according to Hook. [20,21] HAYs have been made of two or more plies of component yarns with different diameters and with extremely different elastic moduli. These plies were twisted together, with the thinner and stiffer yarn wrapping over the thicker and more elastic core ply. When stretched, the two types of plies would swap their roles, leading to a situation where the thinner and stiffer ply became the straight core and the thicker and more elastic ply turned into the binder, as shown in Figure 1. However, it remains to be a challenge to produce stable helical yarns, with matched lengths of the two yarn plies, t...

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Manufacture and Evaluation of Auxetic Yarns and Woven Fabrics

Gao

Liu

et al. 2020

Physica Status Solidi (b)

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“…In their paper Tensile and Deformation Behavior of Auxetic Plied Yarns Ng and Hu develop the double helix yarn concept to 4‐ply and 6‐ply yarn systems. The 4‐ply system, comprising two centrally‐ located thick soft yarns with two thin stiff yarns spiraling around them, is investigated in detail and compared to the double helix yarn and 6‐ply yarn.…”

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Auxetics and Other Systems of Anomalous Characteristics

2017

Physica Status Solidi (b)

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“…In these cases, the strength values of interest must be exclusively determined with the support of experimental tests. Special care is actually spent also for the use of auxetic materials, as efficient alternatives in the field of textile architectures, see [62][63][64][65][66].…”

Section: Synclastic Structures Flat Structures Anticlastic Structuresmentioning

confidence: 99%

Textiles and Fabrics for Enhanced Structural Glass Facades: Potentials and Challenges

Bedon

Rajčić

2019

Buildings

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The use of textiles in architecture can cover a wide set of solutions and functions, spanning from buildings, towards geotechnical, aeronautic or automotive fields, etc. Special applications involve textiles in the health care or dressing scenarios. A multitude of other functions can then be found relatively for the use of textiles in building engineering and facades. As far as traditional facades or roofs composed of glass are taken into account, textiles offer a relevant number of potential uses that are specifically focused on energy, acoustic, insulation and even structural goals, in addition to pure architectural objectives. It is known that glass is relatively versatile, but has intrinsic needs and thermo-physical and mechanical features that require dedicated design methods, towards safe design purposes. Glass itself, in the form of constructional material, cannot be directly compared to other consolidated solutions for buildings. The same concept applies to textiles, and to their use to enhance other building components. Besides the key advantages deriving from the use of textiles in glass facades and envelopes—in the form of light, thermal or acoustic insulation, or energy efficiency—special care must be spent for specific structural requirements and performances. In some cases, textiles can in fact offer enhanced resistance to ordinary glass structures. In other conditions, textiles in combination with glass can ensure also enhanced acoustic and thermal performances. A multidisciplinary design approach able to properly fit several objectives should be considered. This paper aims at exploring the actual knowledge on glass textiles, with a focus on available tools and research trends, with careful consideration for structural glass facade applications.

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Tensile and Deformation Behavior of Auxetic Plied Yarns

Cited by 27 publications

References 29 publications

Manufacture and Evaluation of Auxetic Yarns and Woven Fabrics

Manufacture and Evaluation of Auxetic Yarns and Woven Fabrics

Auxetics and Other Systems of Anomalous Characteristics

Textiles and Fabrics for Enhanced Structural Glass Facades: Potentials and Challenges

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