Influence of Coating on the Poisson's Ratio of Woven Fabrics

2016 ◽  
Vol 827 ◽  
pp. 27-30 ◽  
Author(s):  
Diana Šimić Penava ◽  
Željko Penava ◽  
Marijana Tkalec
Keyword(s):  
Poisson’S Ratio ◽  
Experimental Testing ◽  
Tensile Force ◽  
Woven Fabrics ◽  
Poisson's Ratio ◽  
Basic Material ◽  
Relative Extension ◽  
Two Samples ◽  
Uniaxial Testing ◽  
Coated Fabrics

Coated fabrics have complex composite structure whose mechanical properties are considerably improved in relation with the initial basic material. They are obtained by applying a certain number of coatings to raw fabrics. In this paper the practical application of uniaxial testing of coated fabrics for determining its breaking properties and Poisson’s ratio is presented. Due to the anisotropy of woven and coated fabrics, Poisson's ratio changes over the fabric sample stretching. Experimental testing were carried out on two samples of plain weave cotton fabrics. The fabrics were tested before coating, and after one, two and three coatings. Samples are stretched with tensile force in the weft and warp direction, and based on different measured values of fabric stretching, warp and weft Poisson's ratio is calculated. The values of tensile force and relative extension of coated fabrics were measured, and breaking force values, elongation at break, contractions at break.

scholarly journals Experimental Analysis of the Tensile Properties of Painting Canvas

2016 ◽  
Vol 16 (4) ◽  
pp. 182-195 ◽  
Author(s):  
Željko Penava ◽  
Diana Šimić Penava ◽  
Marijana Tkalec
Keyword(s):  
Mechanical Properties ◽  
Modulus Of Elasticity ◽  
Poisson’S Ratio ◽  
Experimental Testing ◽  
Tensile Force ◽  
Poisson's Ratio ◽  
Basic Material ◽  
Breaking Force ◽  
Elongation At Break ◽  
Relative Extension

Abstract In this paper, the practical application of uniaxial testing of painting canvas for determining its mechanical properties is presented. Painting canvases have a complex composite structure whose mechanical properties are considerably improved in relation with the initial basic material. Painting canvas or coated fabrics are obtained by applying a certain number of coatings to raw fabrics. Experimental testing and determining mechanical properties of painting canvas under tensile force at different angles in relation to the weft direction are discussed in the paper. The fabrics were tested before coating, as well as after one, two and three coatings. The values of tensile force in relation to relative extension of coated textiles were measured, as well as breaking force values, elongation at break, contraction at break, work to rupture. Based on the experimentally obtained values, modulus of elasticity, Poisson’s ratio and the level of anisotropy of the coated textile materials were calculated. The experimental results demonstrate the applicability of theoretical formulae. The number of coated layers on the raw fabric exerts a significant impact on the Poisson’s ratio. The values of breaking force, elongation at break, work to rupture and modulus of elasticity increase with an increase in the number of coated layers, and at the same time coefficient of anisotropy decrease. It has been shown that by increasing the number of coated layers in a coated material, its anisotropic properties decrease, while isotropic properties increase. With an increase in the number of coatings, the differences between experimental and theoretical values of modulus of elasticity decrease.

Deformation behavior of auxetic woven fabric made of foldable geometry in different tensile directions

2020 ◽  
Vol 91 (1-2) ◽  
pp. 87-99
Author(s):  
Hasan Kamrul ◽  
Weiguo Dong ◽  
Adeel Zulifqar ◽  
Shuaiquan Zhao ◽  
Minglonghai Zhang ◽  
...  
Keyword(s):  
Poisson’S Ratio ◽  
Tensile Deformation ◽  
Tensile Loading ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Ratio Effect ◽  
Negative Poisson's Ratio ◽  
Principal Directions

Auxetic woven fabrics made with special geometrical structures have gained the interest of textile scientists in recent years. This paper reports a study on auxetic woven fabric based on a double-directional parallel in-phase zig-zag foldable geometrical structure. Such a fabric has been already produced and investigated for its negative Poisson's ratio effect in two principal directions (weft and warp directions). However, its negative Poisson's ratio effect in biased tensile directions as well as under repeated tensile loading conditions has not been studied yet. Therefore, in this paper, these two limitations are addressed. The auxetic woven fabric was firstly fabricated, and then subjected not only to tensile tests in different tensile directions, including two principle directions and three biased directions, but also to repeated tensile loading. It was found that both the negative Poisson's ratio effect and the resistance to tensile deformation are dependent upon the tensile direction, and the highest negative Poisson's ratio effect and higher resistance to tensile deformation are obtained in two principal directions.

Development of uni-stretch woven fabrics with zero and negative Poisson’s ratio

2017 ◽  
Vol 88 (18) ◽  
pp. 2076-2092 ◽  
Author(s):  
Adeel Zulifqar ◽  
Tao Hua ◽  
Hong Hu
Keyword(s):  
Poisson’S Ratio ◽  
Tensile Tests ◽  
Research Area ◽  
Woven Fabrics ◽  
Poisson's Ratio ◽  
Negative Poisson’S Ratio ◽  
Wide Range ◽  
Differential Shrinkage ◽  
Weaving Technology ◽  
Negative Poisson's Ratio

Fabrics with zero or negative Poisson’s ratio are referred as auxetic fabrics, which have the unusual property of lateral expansion or zero expansion upon stretch. The use of conventional materials and machinery to produce auxetic fabrics has gained the interest of researchers in recent years. However, this approach is limited to knitted fabrics only. The development of auxetic fabric using conventional yarns and weaving technology is a research area that is still unaddressed. This paper reports a study on the development of a novel class of stretchable auxetic woven fabrics by using conventional yarns and weaving machinery. The phenomenon of differential shrinkage was successfully employed to realize auxetic geometries capable of inducing auxetic behavior in woven fabrics, and a series of auxetic woven fabrics were fabricated with elastic and non-elastic yarns and a dobby machine. The uni-axial tensile tests showed that auxetic woven fabrics developed exhibited zero or negative Poisson’s ratio over a wide range of longitudinal strain.

scholarly journals Quantifying cell-generated forces: Poisson’s ratio matters

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Yousef Javanmardi ◽  
Huw Colin-York ◽  
Nicolas Szita ◽  
Marco Fritzsche ◽  
Emad Moeendarbary
Keyword(s):  
Poisson’S Ratio ◽  
Cell Activation ◽  
Immune Cell ◽  
Force Measurement ◽  
Traction Force ◽  
Cellular Systems ◽  
Poisson's Ratio ◽  
Basic Material ◽  
Biological Phenomena ◽  
Force Reconstruction

AbstractQuantifying mechanical forces generated by cellular systems has led to key insights into a broad range of biological phenomena from cell adhesion to immune cell activation. Traction force microscopy (TFM), the most widely employed force measurement methodology, fundamentally relies on knowledge of the force-displacement relationship and mechanical properties of the substrate. Together with the elastic modulus, the Poisson’s ratio is a basic material property that to date has largely been overlooked in TFM. Here, we evaluate the sensitivity of TFM to Poisson’s ratio by employing a series of computer simulations and experimental data analysis. We demonstrate how applying the correct Poisson’s ratio is important for accurate force reconstruction and develop a framework for the determination of error levels resulting from the misestimation of the Poisson’s ratio. In addition, we provide experimental estimation of the Poisson’s ratios of elastic substrates commonly applied in TFM. Our work thus highlights the role of Poisson’s ratio underpinning cellular force quantification studied across many biological systems.

ELASTIC WAVE VELOCITIES IN ROCKS AT HIGH PRESSURES AND TEMPERATURES

Geophysics ◽  
1951 ◽  
Vol 16 (4) ◽  
pp. 577-593 ◽  
Author(s):  
D. S. Hughes ◽  
J. H. Cross
Keyword(s):  
Poisson’S Ratio ◽  
Elastic Moduli ◽  
Opposite Effect ◽  
High Pressures ◽  
Interstitial Water ◽  
Poisson's Ratio ◽  
Laboratory Measurements ◽  
Wave Velocities ◽  
Two Samples ◽  
High Pressures And Temperatures

The variation in dilatational and rotational velocities in rock samples with pressure and temperature has been studied. The measurements were taken at pressures from 1 bar (atmospheric) to 5,000 bars, and temperatures of 25°C. to 200°C. for all samples and up to 300°C. for two samples. We can thus reach a pressure equivalent to some 18 km or 60,000 feet of burial but our highest available temperature probably at most corresponds to no more than 8–9 km. The measured rotational velocities check very well with independent measurements. Laboratory measurements of the dilatational velocity are not available for comparison. From the measured dilatational and rotational velocities, the elastic moduli and Poisson’s ratio may be computed. Values of Poisson’s ratio are tabulated for all samples. In general, highly quartzitic rocks have low values 0.13–0.20 whereas the majority of rocks have values in the range 0.26–0.33. The effect of interstitial water has been investigated in one sandstone and one limestone. The sandstone shows an increase in velocity at low pressure and a decrease at high pressure whereas the limestone shows the opposite effect.

scholarly journals The manufacture and characterization of auxetic, self-curling, and self-folding woven fabrics by helical auxetic yarns

2018 ◽  
Vol 50 (1) ◽  
pp. 3-12
Author(s):  
Sai Liu ◽  
Xingxing Pan ◽  
Dongming Zheng ◽  
Gui Liu ◽  
Zhaoqun Du
Keyword(s):  
Poisson’S Ratio ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Poisson's Ratio ◽  
Natural State ◽  
Practical Applications ◽  
Maximum Value ◽  
Auxetic Structures ◽  
The Relationship

Auxetic fabrics with traditional filaments and auxetic structures have been provided by knitting method; however, the auxetic behavior and applicability of woven fabric with auxetic yarns remain to be studied. Thus, the paper aims to present the special characters of woven fabrics with heliacal auxetic yarns. Auxetic yarns with the maximum value of Poisson's ratio −0.88 were used as weft yarns to do the weaving by the semi-automatic loom. Then the properties of the fabrics have been tested and analyzed under tensions of different directions (warp, weft, and diagonal). The results indicated that the fabric presented auxetic effect with the maximum value of Poisson's ratio −0.3 under diagonal tension and also showed self-curling and self-folding behavior in natural state. Moreover, the relationship between properties and fabric weaves was also discussed and analyzed. It is expected that the study of fabrics with helical auxetic yarns could promote the practical applications of auxetic textiles such as the self-folding property for smart cladding materials.

Nonlinearity of Enhanced Cell Structures Having Auxetic Material Properties

2019 ◽  
Author(s):  
Chulho Yang ◽  
Young Bae Chang ◽  
Dongchan Lee
Keyword(s):  
Poisson’S Ratio ◽  
Fused Deposition Modeling ◽  
Experimental Testing ◽  
Tensile Load ◽  
Polymeric Materials ◽  
The Body ◽  
Poisson's Ratio ◽  
Fused Deposition ◽  
Axial Forces ◽  
Load Conditions

Abstract This research is aimed at proposing an enhanced re-entrant hexagonal structure and examining its auxetic behavior in compressive or tensile load conditions. An integrated experimental and finite element analysis (FEA) approach was used to investigate the behavior of the proposed structures in combination with polymeric materials (thermoplastic polyurethane (TPU) materials such as Ninjaflex® and Semiflex®). We focused on the effect of nonlinearity of the structure on the overall stiffness and shock-absorption performance of the body protection pads. FEA models were used to examine how the stiffness and Poisson’s ratio are affected by static load conditions and also how the dynamic loads are transmitted through the auxetic structure. The static FEA models were verified through experimental testing. Advanced additive manufacturing (3D printing) techniques such as Fused Deposition Modeling (FDM) were used to build fixtures and prototypes of the auxetic polymeric structures. Structural stiffness and Poisson’s ratio were examined not only in tensile loading condition but also in compression. Axial and lateral deformations were measured for given axial forces on the experimental model, and the measured values of Poisson’s ratio were compared with the computational results. It was shown that the enhanced re-entrant hexagonal structures had nonlinear behavior, which could be a useful property for developing body protection pads and stiffness-varying structures.

Analysis of the mechanical properties of double arrowhead auxetic metamaterials under tension

2020 ◽  
Vol 90 (21-22) ◽  
pp. 2411-2427
Author(s):  
Longxin Gu ◽  
Qiaoli Xu ◽  
Dongming Zheng ◽  
Haochen Zou ◽  
Zhenrui Liu ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
Poisson’S Ratio ◽  
Tensile Force ◽  
Three Dimensional ◽  
Poisson's Ratio ◽  
Element Analysis ◽  
Transverse Tensile ◽  
The Finite Element Analysis ◽  
Tensile Forces ◽  
Abaqus Software

In order to study the deformation behavior of double arrowhead (DAH) auxetic metamaterials under different forces with different directions as well as the effects of the geometry parameters on the Poisson's ratio, this paper assembled an advanced researching method by combining the industrial design of SolidWorks software, the finite element analysis of Abaqus software and three-dimensional printed technology. Results show that the DAH structure expanded in the direction perpendicular to the force first and contracted with the strain increasing when it was pulled by the uniaxial force, no matter which direction the force is applied. Besides, the auxetic effect of the DAH structure under the tensile force in the X direction is longer than that under the tensile force in the Y direction. It is more resistant to compression when the DAH structure is subjected to transverse tensile forces than when it is subjected to longitudinal tensile forces. The angle of the V-shaped short truss has a significant impact on the negative Poisson's ratio of the DAH structure, while the angle of the V-shaped long truss angle has little influence on its auxetic performance. Specifically, the smaller the angles, the better the auxetic effect.

scholarly journals A Study of Woven Fabrics Made of Helical Auxetic Yarns

2021 ◽  
Author(s):  
Yajie Gao ◽  
Xiaogang Chen
Keyword(s):  
Poisson’S Ratio ◽  
Numerical Study ◽  
Tensile Modulus ◽  
Woven Fabrics ◽  
Woven Fabric ◽  
Poisson's Ratio ◽  
Key Factors ◽  
Warp Yarn ◽  
Weave Structure ◽  
Best Parameters

AbstractThe paper presents a study on woven fabrics made of helical auxetic yarns (HAYs) and their key factors on Poisson’s ratio under tension. The work aims to create and evaluate auxetic woven fabrics with optimal parameters for achieving better auxeticity including weave structure, wrapping angle of the auxetic yarn, thickness of the auxetic yarn and properties of the warp yarn. The maximum negative Poisson’s ratio (NPR) of the woven fabric can be achieved as low as -2.92 for experiments. Then, a numerical study has been carried out as well to assist the development of auxetic woven fabrics. The findings of this paper showed longer float length, lower wrapping angle of the auxetic yarn, a thinner diameter of the auxetic yarn as well as lower tensile modulus of the warp yarn led to higher auxetic behaviour. This can also provide a reference for researchers to select the best parameters for producing the auxetic woven fabrics.

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