Crimp analysis of worsted fabrics in the terms of fabric extension behaviour

Shahabi, N. Ezaz; Mousazadegan, Fatemeh; Varkiyani, S. Mohammad Hosseini; Saharkhiz, Siamak

doi:10.1007/s12221-014-1211-y

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…Shahabi et al. 8 used an image processing procedure to observe the crimp interchange behavior, which is dependent on the competitiveness of yarn tension between warp and weft yarns. Realff 9 used a series of experimental methods including the traditional ravel strip test, videotaping, encapsulation and photography to research yarn crimp and cross-sectional change.…”

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confidence: 99%

“…Chepelyuk 7 developed a method of determining the parameters of yarns and that could approximate the crimp height ratio of the warp and weft within the woven fabric structure accurately. Shahabi et al 8 used an image processing procedure to observe the crimp interchange behavior, which is dependent on the competitiveness of yarn tension between warp and weft yarns. Realff 9 used a series of experimental methods including the traditional ravel strip test, videotaping, encapsulation and photography to research yarn crimp and cross-sectional change.…”

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confidence: 99%

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Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Zhang

et al. 2017

Textile Research Journal

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The non-uniform stress distribution of woven fabric has a significant influence not only on its mechanical performance in service, but also on its weaving efficiency in the fabrication process. For investigating the stress distribution in woven fabric, a numerical model at the yarn scale was established to simulate the interlacing process between the weft and warp yarns using an explicit finite element solver. The yarns were assumed to be a homogeneous continuum and the transversal isotropic constitutive equation was used. A modified lenticular initial shape was used as the cross-section of the yarn and trajectories of warp and weft yarns were set to be straight. The classical Amonton–Coulomb law was used for the tangential behavior between the weft and warp yarns. The simulation results reveal that the interaction between weft and warp yarns consists of three phases in terms of contact, adhesion and sliding. The sectional stress distribution in the weft yarn determined by multi-points contact between a single weft yarn and a group of warp yarns was also analyzed. The tension stress of the weft yarn was larger in the middle part than that in both sides. Based on the numerical model, the effects of two key parameters, namely the frictional coefficient and weft pre-tension, on the stress distribution were discussed in detail. The weft crimp angle and warp tension distribution uniformity decreased as the frictional coefficient decreased, whereas the warp tension fluctuation range did not obviously decrease. However, an improved method by exerting pre-tension in two ends of weft yarn was proposed and the warp tension fluctuation range was significantly decreased. The distribution trend of warp tension obtained from the numerical simulation showed an acceptable tendency with experiment measurements.

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Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Zhang

et al. 2017

Textile Research Journal

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“…Threads lengthen in the direction of load after removal of crimp, and the opposite thread system gains higher crimp. This will increase until one thread system does not interfere with the other [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Method of Predicting the Crimp of Jacquard-Woven Fabrics

2021

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The aim of this study was to investigate the distribution of crimp in new jacquard fabric structures (in which one-layer and two-layer weaves are combined) in the fabric width and to create a method of crimp prediction. It was established that crimp was around 18.80% and changed within the limits of errors, i.e., a range of only ~4%, in the fabric width. It can therefore be said that the warp crimp was constant in the fabric width. Because the warp crimp of jacquard fabric changed insignificantly (within the limits of errors), it can be stated that the fabric-setting parameters and structural solutions were chosen and matched correctly, and such fabric can be woven on any jacquard weaving loom.

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“…Shahabi et al carried out a very detailed investigation on the effect of crimp on the contraction of worsted fabrics under tensile loading [4]. It was stated that during the weaving process, warp yarns are held in tension and weft yarns cross over between the warp yarns to form a woven fabric.…”

Section: Introductionmentioning

confidence: 99%

“…The straightened yarns conversely introduce more crimp to the yarns perpendicular to the loading direction. As a result, the fabric is contracted in the transverse direction, and a positive PR is obtained [4]. In the area of knitted fabric, Ajeli and Jeddi theoretically and experimentally studied the relationship between the warp-knitted structures and PR.…”

Section: Introductionmentioning

confidence: 99%

Woven Fabrics Made of Auxetic Plied Yarns

2018

Polymers

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Auxetic plied yarns are specially constructed with two types of single yarns of different sizes and moduli. This paper investigates how to use these types of yarns to produce woven fabrics with auxetic effects. Four-ply auxetic yarns were first incorporated into a series of woven fabrics with different design parameters to study their auxetic behavior and percent open area during extension. Effects of auxetic plied yarn arrangement, single component yarn properties, weft yarn type, and weave structure were then evaluated. Additional double helical yarn (DHY) and 6-ply auxetic yarn woven fabrics were also made for comparison. The results show that the alternative arrangement of S-and Z-twisted 4-ply auxetic yarns in a woven fabric can generate a higher negative Poisson's ratio (NPR) of the fabric. While the higher single stiff yarn modulus of auxetic yarn can result in greater NPR behavior, finer soft auxetic yarn does not necessarily generate such an effect. Weft yarns with low modulus and short float over the 4-ply auxetic yarns in fabric structure are favorable for producing high NPR behavior. The weft cover factor greatly affects the variation of the percent open area of the 4-ply auxetic yarn fabrics during extension. When different kinds of helical auxetic yarns (HAYs) are made into fabrics, the fabric made of DHY does not have the highest NPR effect but it has the highest percent open area, which increases with increasing tensile strain.

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Crimp analysis of worsted fabrics in the terms of fabric extension behaviour

Cited by 8 publications

References 1 publication

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Effect of the frictional coefficient and pre-tension on stress distribution of fabric during the weaving process

Method of Predicting the Crimp of Jacquard-Woven Fabrics

Woven Fabrics Made of Auxetic Plied Yarns

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