Engineered Warp Knit Auxetic Fabrics

Ugbolue, S. C. O.; Kim, Yong K.; Warner, Steven B.; Fan, Qinguo; Yang, Chaoyu; Kyzymchuk, Olena; Feng, Yani; Lord, John

doi:10.4172/2165-8064.1000e103

Cited by 12 publications

(17 citation statements)

References 16 publications

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“…These data, shown in figures 8-10, are indeed representative of a large class of auxetic materials as a similar behaviour has been observed in open cell-compliant polyurethane foams [7], chiral honeycombs [17] and even in warp knit auxetic fabrics [18].…”

Section: Introductionsupporting

confidence: 71%

“…These experimental results are, indeed, representative of the mechanical properties of a wide class of auxetic materials [7,17,18]. To avoid the well-known problems inherent to the non-monotonicity of the Blatz-Ko model for f < 1 [23], we have set f = 1; as a consequence, the constitutive model has only three parameters: μ 0 , ν 0 and λ I .…”

Section: Experimental Data Analysismentioning

confidence: 93%

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A continuum hyperelastic model for auxetic materials

Ciambella

Saccomandi

2014

Proc. R. Soc. A.

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We propose a simple mathematical model to describe isotropic auxetic materials in the framework of the classical theory of nonlinear elasticity. The model is derived from the Blatz-Ko constitutive equation for compressible foams and makes use of a nonmonotonic Poisson function. An application to the modelling of auxetic foams is considered and it is shown that the material behaviour is adequately described with only three constitutive parameters.

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Section: Introductionsupporting

confidence: 71%

Section: Experimental Data Analysismentioning

confidence: 93%

A continuum hyperelastic model for auxetic materials

Ciambella

Saccomandi

2014

Proc. R. Soc. A.

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“…However, in auxetic materials the phenomena is just reverse, i.e. when material stretched it expands transversely and contracts during compression that is, they exhibit negative Poisson's ratio (NPR) [1][2][3][4][5][6][7][8][9]. Negative Poisson's ratios are theoretically accepted.…”

Section: Introductionmentioning

confidence: 99%

“…Auxetic materials gains specific interest due to their unusual behaviour which results improved mechanical properties, such as improved fracture toughness, higher indentation resistance, high energy absorption, sound absorption properties, improved shear modulus, hardness, synclastic curvature (dome shape on out-ofplane flexure) in sheets and panels, high volume change, high impact resistance, etc. [2,[6][7][8][9][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Auxetic textile materials are widely used as filter, sports clothing, biomedical application, defense industries, etc. Also, auxetic composites can find potential applications in aerospace and automotive industry as well as in materials for protection, where non-auxetic composites with high specific strength and stiffness are currently used [2,6,8,[10][11][12]15].…”

Section: Introductionmentioning

confidence: 99%

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Development, characterization and analysis of auxetic structures from braided composites and study the influence of material and structural parameters

Magalhães

Subramani

Tomas

et al. 2016

Composites Part A: Applied Science and Manufacturing

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Auxetic materials are gaining special interest in technical sectors due to their attractive mechanical behaviour. This paper reports a systematic investigation on missing rib design based auxetic structures produced from braided composites for civil engineering applications. The influence of various structural and material parameters on auxetic and mechanical properties was thoroughly investigated. The basic structures were also modified with straight longitudinal rods to enhance their strengthening potential in structural elements. Additionally, a new analytical model was proposed to predict Poisson's ratio through a semi empirical approach. Auxetic and tensile behaviours were also predicted using finite element analysis. The auxetic and tensile behaviours were observed to be more strongly dependent on their structural parameters than the material parameters. The developed analytical models could well predict the auxetic behaviour of these structures except at very low or high strains. Good agreement was also observed between the experimental results and numerical analysis.

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Deformation Behaviors of Auxetic Warp Knitted Fabrics Based on Reentrant Geometry

Zhao

Chang

Yang

et al. 2021

Physica Status Solidi (b)

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A series of auxetic warp knitted fabrics based on reentrant geometry were developed in our previous study and their Poisson's ratio in the wale direction and course direction can be as low as −0.5 and −0.15, respectively. However, the quantitative relationships between structural parameters and auxetic effect, which can offer a guide to the design and manufacture process, are still unknown. Herein, the aim is to find such relationships. Based on the geometrical analysis, two semiempirical equations between Poisson's ratio and tensile strain are established when stretched in the wale direction and course direction, respectively. The study shows that the established semiempirical equations fit well with experimental results and can be used to predict auxetic effect of fabrics made with the same type of materials and similar structures. With the relationships proposed, warp knitted fabrics can be designed and manufactured directly without trials to obtain the desired auxetic effect, which can largely save the time and cost of production.

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Engineered Warp Knit Auxetic Fabrics

Cited by 12 publications

References 16 publications

A continuum hyperelastic model for auxetic materials

A continuum hyperelastic model for auxetic materials

Development, characterization and analysis of auxetic structures from braided composites and study the influence of material and structural parameters

Deformation Behaviors of Auxetic Warp Knitted Fabrics Based on Reentrant Geometry

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