Yarns

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Ian A Kinloch - One of the best experts on this subject based on the ideXlab platform.

  • finite element analysis of effect of inter yarn friction on ballistic impact response of woven fabrics
    Composite Structures, 2016
    Co-Authors: Ying Wang, Xiaogang Chen, Robert J Young, Ian A Kinloch
    Abstract:

    Abstract Friction has shown to have a significant effect in determining the ballistic impact performance of woven fabrics. Many efforts were made to investigate how inter-yarn friction affects ballistic impact response of woven fabrics in the past decades. However, fundamental understanding of mechanics mechanisms of how inter-yarn friction works in woven fabric panels still needs to be established and improved. It is vitally important to understand for example how friction affects the distribution of stress and the magnitude of stress in Yarns. This is necessary in determining the failure of the Yarns and the energy absorption in a ballistic event. This paper presents a detailed analysis on ballistic impact behaviour of woven fabrics using the finite element method. It has been found that the magnitude of stresses on the yarn surface is sensitive to the frictional coefficient between the crossing Yarns in the fabric. Increasing friction between the Yarns reduces the stress at the edge of the projectile–fabric contact region. The fabric with higher inter-yarn friction between the Yarns causes the impacting projectile longer time to penetrate the fabric compared to fabrics with lower friction between the Yarns. The energy absorbed by the woven fabrics with higher inter-yarn friction is more than that by fabrics with lower inter-yarn friction. Increasing friction between the Yarns decreases the longitudinal wave velocity whereas the transverse wave velocity is increased along with the increase of inter-yarn friction.

Majid Safar Johari - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Using the New Solo-siro Spun Process on Structural and Mechanical Properties of Yarns
    Fibres & Textiles in Eastern Europe, 2013
    Co-Authors: Parham Soltani, Majid Safar Johari
    Abstract:

    Mechanical and physical properties of spun Yarns are very important for post-spinning operations as well as for determining some final fabric characteristics. These properties greatly depend on the yarn structure characterised by the geometrical arrangement of fi bres in the yarn body. The geometry of the spinning triangle plays a significant role in determining the spun yarn structure. Solo-siro is a new spinning system which proposes fundamental modifications to the Solo spinning process with the aim of altering the geom etry of the spinning triangle and hence the yarn structure. By comparing Solo-siro and Solo spun Yarns, the present research focuses on identifying those structural differences which can be used to explain the properties of these novel Yarns. Results show that Solo-siro spun Yarns enjoy superior physical and mechanical properties in comparison with Solo spun Yarns. This can be attributed to the higher mean fibre position, higher migration factor, greater proportion of fibres which are broken during yarn failure and lower hairiness in Solo-siro spun Yarns.

  • Modeling Spun Yarns Migratory Properties Using Artificial Neural Network
    Fibers and Polymers, 2012
    Co-Authors: Parham Soltani, Morteza Vadood, Majid Safar Johari
    Abstract:

    The mechanical and physical properties of spun Yarns and fabrics depend not only on properties of constituent fibers, but also the yarn structure characterized by geometrical arrangement of fibers in the yarn body. Although there are many studies related to analyzing the migratory properties of spun Yarns, there are no studies available about predicting yarn migration parameters. Therefore, the main aim of this research is to introduce a new approach to predict migratory properties of different kinds of spun Yarns, namely siro, solo, compact and conventional ring-spun Yarns. To achieve the objectives of the research, general physical and mechanical properties of spun Yarns together with existing standards were thoroughly studied. Spun yarn migratory properties were predicted using intelligent technique of artificial neural network (ANN). Results signified that the ANN models can predict precisely the yarn migratory properties on the basis of a series of yarn physical and mechanical properties.

  • The effect of spinning parameters on mechanical and physical properties of core-spun Yarns produced by the three-strand modified method (TSMM)
    Fibers and Polymers, 2012
    Co-Authors: R. Mahlouj.chi, Parham Soltani, Majid Safar Johari
    Abstract:

    The effect of spinning parameters on core-spun Yarns properties manufactured using three-strand modified method (TSMM) was analyzed. Of the various spinning parameters, strand spacing, yarn linear density and yarn twist have a crucial effect on core-spun yarn properties. To achieve the objectives of this research, general physical properties of core-spun Yarns together with existing standards were thoroughly studied. First of all, the strand spacing and yarn linear density were optimized. Afterwards, the effects of variation of yarn twist and sheath roving linear density on core-spun Yarns properties were investigated. Finally, the physical and mechanical properties of TSMM Yarns were compared with those of siro and conventional ring core-spun Yarns counterparts. It was found that, the best strand spacing and yarn linear density to produce core-spun Yarns are 8 mm and 45 tex, respectively. Results showed that, tenacity of TSMM Yarns increases up to a certain twist level beyond which it reduces. The result confirmed that 45 tex Yarns produced by three rovings of the same count are superior with regards to tenacity and hairiness. The optimized Yarns produced by three-strand modified method enjoy superior physical and mechanical properties in comparison to the ring and siro core-spun Yarns.

  • a study on siro solo compact and conventional ring spun Yarns part ii yarn strength with relation to physical and structural properties of Yarns
    Journal of The Textile Institute, 2012
    Co-Authors: Parham Soltani, Majid Safar Johari
    Abstract:

    The strength of siro-, solo-, compact-, and conventional ring-spun Yarns has been examined with reference to yarn migration parameters, spinning-in-coefficient, number of broken fibers, and yarn hairiness. The measured results are presented in the forms of diagrams and tables. Results reveal that at various levels of gage length and strain rate, siro-spun Yarns exhibit the highest tenacity, followed by compact-spun Yarns, solo-spun Yarns, and conventional ring-spun Yarns. Analysis of the results demonstrate that the higher tenacity values of siro-spun Yarns can be attributed to the higher mean fiber position, higher migration factor, greater proportion of broken fibers, and lower hairiness. It is also found that the strength of Yarns to a considerable extent is governed by yarn structure, gage length, and strain rate.

  • a study on siro solo compact and conventional ring spun Yarns part i structural and migratory properties of the Yarns
    Journal of The Textile Institute, 2012
    Co-Authors: Parham Soltani, Majid Safar Johari
    Abstract:

    Properties of spun Yarns are mainly affected by fiber properties and yarn structure. Yarn structure is principally influenced by the spinning system. In fact, each spinning system tends to produce a distinctive yarn structure. Recent refinements in spinning technologies have yielded significant improvement in yarn structure. Siro, solo and compact spinning are the new spinning systems to have made a breakthrough until recently. Of the various structural parameters for staple Yarns, fiber migration has a crucial influence on the yarn mechanical properties. Thus, the need for precise and concise information about fiber migration becomes important for better understanding of yarn structure and hence yarn mechanical behavior. The work presented here aims to analyze fiber migration in siro-, solo-, compact-, and conventional ring-spun Yarns by varying the twist factor. The results demonstrate that the siro-spun Yarns exhibit the highest fiber migration parameters, followed by compact-spun Yarns, solo-spun yarn...

K P S Cheng - One of the best experts on this subject based on the ideXlab platform.

Anne Schwarz - One of the best experts on this subject based on the ideXlab platform.

  • A study on the morphology of thin copper films on para-aramid Yarns and their influence on the yarn’s electro-conductive and mechanical properties:
    Textile Research Journal, 2012
    Co-Authors: Anne Schwarz, Georgios Priniotakis, Jean Hakuzimana, Tebello Nyokong, Philippe Westbroek, Lieva Van Langenhove
    Abstract:

    The latest technological advances in new materials and devices enabled wearable systems to be created by utilizing textile solutions. These solutions require electro-conductive Yarns as a basic component. Although the production of electro-conductive yarn is widely reported, research is still necessary to characterize them to advance their electro-conductive and mechanical properties. Hence, we served this need and characterized copper-coated para-aramid Yarns produced by an in-house developed electroless deposition method. In this paper we present our investigation on the yarn's copper layer characteristics after deposition. Furthermore, we looked, in depth, at the yarn's electro-conductive properties before and after washing as well as their mechanical properties before and after copper deposition. We found a dependency of the copper layer morphology on its deposition time. This is directly correlated to the resulting layer thickness and hence to the yarn's electro-conductive properties, demonstrating the autocatalytic nature of the coating process. Above that, the electro-conductive properties of the coated yarn linearly decrease with washing cycles. Furthermore, the copper coating impairs the yarn's mechanical properties decreasing its specific stress at break by 30%.

  • a study on the morphology of thin copper films on para aramid Yarns and their influence on the yarn s electro conductive and mechanical properties
    Textile Research Journal, 2012
    Co-Authors: Anne Schwarz, Georgios Priniotakis, Jean Hakuzimana, Tebello Nyokong, Philippe Westbroek, Lieva Van Langenhove
    Abstract:

    The latest technological advances in new materials and devices enabled wearable systems to be created by utilizing textile solutions. These solutions require electro-conductive Yarns as a basic component. Although the production of electro-conductive yarn is widely reported, research is still necessary to characterize them to advance their electro-conductive and mechanical properties. Hence, we served this need and characterized copper-coated para-aramid Yarns produced by an in-house developed electroless deposition method. In this paper we present our investigation on the yarn's copper layer characteristics after deposition. Furthermore, we looked, in depth, at the yarn's electro-conductive properties before and after washing as well as their mechanical properties before and after copper deposition. We found a dependency of the copper layer morphology on its deposition time. This is directly correlated to the resulting layer thickness and hence to the yarn's electro-conductive properties, demonstrating the autocatalytic nature of the coating process. Above that, the electro-conductive properties of the coated yarn linearly decrease with washing cycles. Furthermore, the copper coating impairs the yarn's mechanical properties decreasing its specific stress at break by 30%.

  • electro conductive and elastic hybrid Yarns the effects of stretching cyclic straining and washing on their electro conductive properties
    Materials & Design, 2011
    Co-Authors: Anne Schwarz, Ilda Kazani, L Cuny, C Hertleer, F Ghekiere, G De Clercq, G De Mey, L Van Langenhove
    Abstract:

    Abstract Electro-conductive Yarns can be produced in various ways and can obtain very different properties in terms of conductivity, touch, as well as strength and elasticity. In this research, it was focussed on manufacturing elastic and electro-conductive Yarns (el2-Yarns) via hollow spindle spinning. All Yarns comprised elastic core Yarns, based on rubber, around which electro-conductive winding Yarns, based on silver, copper and stainless steel, were wound. This paper presents the yarn’s electrical characteristics while stretching and after exposure to cyclic straining and washing. Analyzing the el2-yarn’s electro-conductive properties upon elongation, revealed that their electrical resistance remains constant over elongation levels up to 100%. Furthermore, it is shown that both, cyclic straining and washing, decrease the yarn’s electrical performance.

Ying Wang - One of the best experts on this subject based on the ideXlab platform.

  • finite element analysis of effect of inter yarn friction on ballistic impact response of woven fabrics
    Composite Structures, 2016
    Co-Authors: Ying Wang, Xiaogang Chen, Robert J Young, Ian A Kinloch
    Abstract:

    Abstract Friction has shown to have a significant effect in determining the ballistic impact performance of woven fabrics. Many efforts were made to investigate how inter-yarn friction affects ballistic impact response of woven fabrics in the past decades. However, fundamental understanding of mechanics mechanisms of how inter-yarn friction works in woven fabric panels still needs to be established and improved. It is vitally important to understand for example how friction affects the distribution of stress and the magnitude of stress in Yarns. This is necessary in determining the failure of the Yarns and the energy absorption in a ballistic event. This paper presents a detailed analysis on ballistic impact behaviour of woven fabrics using the finite element method. It has been found that the magnitude of stresses on the yarn surface is sensitive to the frictional coefficient between the crossing Yarns in the fabric. Increasing friction between the Yarns reduces the stress at the edge of the projectile–fabric contact region. The fabric with higher inter-yarn friction between the Yarns causes the impacting projectile longer time to penetrate the fabric compared to fabrics with lower friction between the Yarns. The energy absorbed by the woven fabrics with higher inter-yarn friction is more than that by fabrics with lower inter-yarn friction. Increasing friction between the Yarns decreases the longitudinal wave velocity whereas the transverse wave velocity is increased along with the increase of inter-yarn friction.