Deformation by one-dimensional loading of woven fabric
Title Alternative:Deformation by one-dimensional loading of woven fabric
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Date
2010
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Publisher
Technická Univerzita v Liberci
Abstract
The target of this current work was to examine of deformation behaviour of structures of woven fabrics after mechanical loading. The study concerns various fabric structures made from same yarns of polypropylene of weave structures of plain with different setts of weft and same setts of warp. In order to measure the mechanical properties of fabric objectively, testometric tensile tester is used to determine longitudinal and transversal deformation of fabric as the material under axial tension elongates in length which affects the geometrical properties and parameters of fabrics like crimp and diameter respectively. Strain increases in the loading direction and decreases in the transverse direction. Poisson's ratio is used for the analysis of the structure of fabrics subjected to deforming loads, and analysis of the property of fabrics with respect to the basic parameters of fibres and yarns. The statistical regression method was used for evaluation of the results. The relationship between Poisson?s ratio and strain shows that Poisson's ratio decreases fast in the beginning and slowly towards the end. For all the fabrics elongated in warp and weft direction the results, show that for fabric with higher setts, higher contraction ratio is observed in the beginning and decreases at a higher speed and the fabric with lower sett has lower Poisson's ratio and decreases at a lower rate, reason being, for higher weft setts the yarns are more compressed than in small weft setts. After stretching, highest sett of warp or so called limit setts of warp occurred. In the case of limit setts of warp the bows of weft yarn are mutually connected (border), so that the length is close to zero. There is no model which describes decreasing tendency and the convex shape parameters of curves. They can be described according to the hypothetical structure of Pierce model, assuming that the yarn in the fabric are totally flexible but non deformable transversally. In reality the yarn in the fabric are flexible and extensible.
The target of this current work was to examine of deformation behaviour of structures of woven fabrics after mechanical loading. The study concerns various fabric structures made from same yarns of polypropylene of weave structures of plain with different setts of weft and same setts of warp. In order to measure the mechanical properties of fabric objectively, testometric tensile tester is used to determine longitudinal and transversal deformation of fabric as the material under axial tension elongates in length which affects the geometrical properties and parameters of fabrics like crimp and diameter respectively. Strain increases in the loading direction and decreases in the transverse direction. Poisson's ratio is used for the analysis of the structure of fabrics subjected to deforming loads, and analysis of the property of fabrics with respect to the basic parameters of fibres and yarns. The statistical regression method was used for evaluation of the results. The relationship between Poisson?s ratio and strain shows that Poisson's ratio decreases fast in the beginning and slowly towards the end. For all the fabrics elongated in warp and weft direction the results, show that for fabric with higher setts, higher contraction ratio is observed in the beginning and decreases at a higher speed and the fabric with lower sett has lower Poisson's ratio and decreases at a lower rate, reason being, for higher weft setts the yarns are more compressed than in small weft setts. After stretching, highest sett of warp or so called limit setts of warp occurred. In the case of limit setts of warp the bows of weft yarn are mutually connected (border), so that the length is close to zero. There is no model which describes decreasing tendency and the convex shape parameters of curves. They can be described according to the hypothetical structure of Pierce model, assuming that the yarn in the fabric are totally flexible but non deformable transversally. In reality the yarn in the fabric are flexible and extensible.
The target of this current work was to examine of deformation behaviour of structures of woven fabrics after mechanical loading. The study concerns various fabric structures made from same yarns of polypropylene of weave structures of plain with different setts of weft and same setts of warp. In order to measure the mechanical properties of fabric objectively, testometric tensile tester is used to determine longitudinal and transversal deformation of fabric as the material under axial tension elongates in length which affects the geometrical properties and parameters of fabrics like crimp and diameter respectively. Strain increases in the loading direction and decreases in the transverse direction. Poisson's ratio is used for the analysis of the structure of fabrics subjected to deforming loads, and analysis of the property of fabrics with respect to the basic parameters of fibres and yarns. The statistical regression method was used for evaluation of the results. The relationship between Poisson?s ratio and strain shows that Poisson's ratio decreases fast in the beginning and slowly towards the end. For all the fabrics elongated in warp and weft direction the results, show that for fabric with higher setts, higher contraction ratio is observed in the beginning and decreases at a higher speed and the fabric with lower sett has lower Poisson's ratio and decreases at a lower rate, reason being, for higher weft setts the yarns are more compressed than in small weft setts. After stretching, highest sett of warp or so called limit setts of warp occurred. In the case of limit setts of warp the bows of weft yarn are mutually connected (border), so that the length is close to zero. There is no model which describes decreasing tendency and the convex shape parameters of curves. They can be described according to the hypothetical structure of Pierce model, assuming that the yarn in the fabric are totally flexible but non deformable transversally. In reality the yarn in the fabric are flexible and extensible.
Description
katedra: KTT; přílohy: 1 CD; rozsah: 111 s.
Subject(s)
mechanical properties, geometrical properties and parameters, yarn, poisson's ratio, pierce's model, mechanical properties, geometrical properties and parameters, yarn, poisson's ratio, pierce's model