The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Chokri Cherif - One of the best experts on this subject based on the ideXlab platform.
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High Performance Thermoplastic Composite from Flat-Knitted Multi-layer Textile Preform using Hybrid Yarn
Composites Science and Technology, 2011Co-Authors: Md Abounaim, Gerald Hoffmann, Olaf Diestel, Chokri CherifAbstract:Modern flat Knitting machines using high performance yarns are able to Knit Fabrics including the reinforcement yarns arranged differently into Knit structures. Due to their improved mechanical properties, composites made from multi-layer Knit Fabrics show great potential in lightweight applications. This paper reports on the development of flat Knitted multi-layer textile preforms for high performance thermoplastic composites using hybrid yarns made of glass (GF) and polypropylene (PP) filaments. Such textile preforms with different reinforcements were used to consolidate into 2D thermoplastic composites. Moreover, the mechanical properties of these composites were studied. The mechanical properties of 2D composites were found to be greatly affected by different arrangements of reinforcement yarns. The integration of reinforcement yarns as biaxial inlays (warp and weft yarns) is found to be the best solution for Knitting, whereas tuck stitch shaped and unidirectional arranged reinforcements offer also promising application possibilities.
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Thermoplastic composites from curvilinear 3D multi-layer spacer Fabrics:
Journal of Reinforced Plastics and Composites, 2010Co-Authors: Abounaim, Gerald Hoffmann, Olaf Diestel, Chokri CherifAbstract:This article reports on the development of thermoplastic composites using innovative curvilinear 3D multi-layer flat Knitted spacer Fabrics produced by single stage manufacturing. Thermoplastic composites from textile-based, complex-shaped sandwich preforms, for instance, curvilinear-shaped 3D multi-layer spacer Fabrics show great potential for lightweight applications. Faster production time and reduction of waste can be achieved by single stage manufacturing of such 3D textile preforms. Spacer-shaped 3D textile preforms were developed using commingled hybrid yarns made of GF and PP filaments. This 3D spacer fabric was consolidated to 3D composite using the developed mechanical tools. In order to predict the mechanical performance of 3D composites, mechanical properties of reinforcement yarns unraveled from 3D spacer Fabrics, 2D Knit Fabrics, and 2D composites using the 2D Knit Fabrics produced in the same manner as the individual layers of 3D spacer Fabrics were studied. The results are promising for ap...
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Thermoplastic composite from innovative flat Knitted 3D multi-layer spacer fabric using hybrid yarn and the study of 2D mechanical properties
Composites Science and Technology, 2010Co-Authors: Abounaim, Gerald Hoffmann, Olaf Diestel, Chokri CherifAbstract:Due to their improved mechanical properties, 3D multi-layer spacer Fabrics could be used for lightweight applications such as textile-based sandwich preforms. Modern flat Knitting machines using high performance yarns are able to Knit complex 3D multi-layer spacer Fabrics consisting of individual surface and connecting layers. This paper reports on the development of 3D flat Knitted spacer fabric for 3D thermoplastic composites using hybrid yarns made of glass (GF) and polypropylene (PP) filaments. Moreover, mechanical properties of reinforcement yarns, 2D Knit Fabrics and 2D composites manufactured using various integration methods of reinforcement yarns were also studied. The integration of reinforcement yarns as biaxial inlays (warp and weft yarns) is found to be the best solution for Knitting, whereas the tuck stitches show optimal results.
Hyoseon Ryu - One of the best experts on this subject based on the ideXlab platform.
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textures and sensible images on structural properties of washable wool and normal wool Knit Fabrics part ii focus on preferences
Journal of the Korean Society of Clothing and Textiles, 2012Co-Authors: Hyun Ah Kim, Hyoseon RyuAbstract:Abstract This study examines the effect of structural properties of F/W wool Knit Fabrics for woman's Knitwearon the preferences for textile designing through analyzing the relationship among the structural properties,mechanical properties, objective hand measurements, and preferences. The ‘Knit structure’ was determinedto be the most important parameter in rating preferences, apart from the ‘preference for cardigans’. Con-sumers preferred washable wool to normal wool when comparing a normal wool Knit with a washablewool Knit on a ‘Knit structure’ factor. Preferred structural properties showed a similar tendency ‘preferencefor fabric’ and the ‘preference for cardigans’, ‘preference for sweaters’ and ‘preference for vests’. The‘sophisticated/feminine’ factor showed a correlation with ‘fabric preference’ and the texture and sensibleimages had a similar effect on fabric preferences. In the relationship between objective hand measurementsand fabric preferences, the KOSHI value had a negative coefficient and the THV value had a positivecorrelation with fabric preferences. In conclusion, we found a consumer preference for more flexibleFabrics.Key words: Washable wool, Structural properties, Texture, Sensible image, Objective hand, Preference;워셔블 울, 구성특성, 질감, 감성이미지, 객관적 태, 선호도
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textures and sensible images on structural properties of washable wool and normal wool Knit Fabrics part i focus on the relationship of subjective evaluation mechanical properties and objective hand measurements and preferences
Journal of the Korean Society of Clothing and Textiles, 2011Co-Authors: Hyun Ah Kim, Hyoseon RyuAbstract:This study examines the effect of the structural properties of F/W wool Knit Fabrics for woman`s Knitwear on the perceptions of textures and sensible images of consumers and present basic data for textile designing by analyzing the relationship among the structural properties, mechanical properties, objective hand measurements and preferences. A total of 12 kinds of Knit Fabrics were prepared and investigated in terms of the differences in the subjective, mechanical properties and objective hand measurements according to the structural properties of Knit Fabrics. The data were analyzed by t-test. The subjective hand attributes of wool Knits through factor analysis are categorized into 6 factors. In particular, the `active/comfort` factor is a meaningful result that reflects the unique characteristics of Knit Fabrics compared to woven Fabrics. Mechanical properties and objective hand measurements have a greater effect on textures than on sensible images; in addition, the structural properties, `gauge` was the most important factor to influence the subjective evaluation.
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a study on the subjective textures sensibilities and the objective handle of Knit Fabrics
Journal of the Korean Society of Clothing and Textiles, 2006Co-Authors: Hyoseon RyuAbstract:The purpose of this study is to analyze the relationship among subjective textures, sensibilities and objective handle of Knit Fabrics and to provide useful information in planning and designing Knit Fabrics. We made 20 plain Knit Fabrics, as specimens, with a combination of 5 kinds of wool/rayon fiber contents and 4 kinds of stitch loop length. For the subjective evaluation, we used 29 questions of subjective textures and sensibilities and employed statistical analysis tools such as factor, Pearson's correlation analysis. An objective handle was measured by Kawabata evaluation system and HV and THV was calculated by KN-402-KT and KN-301-winter. The analysis of a Pearson's correlation with objective properties and handles and structural properties of Knit Fabrics demonstrated a highly linear relationship. Especially, wool/rayon contents and WT of tensile properties and loop stitch length and G of shear properties showed a correlation coefficient over 0.9. But a relationship of objective properties and subjective textures and sensibilities was non-linear and a linear multi-regression analysis showed that a objective handle had a lower prediction power in the area of subjective textures and sensibilities.
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the relationship of structural properties subjective textures and sensibilities of Knit Fabrics wool rayon fiber contents and loop length
Journal of the Korean Society of Clothing and Textiles, 2005Co-Authors: Hyoseon RyuAbstract:The purpose of this study is to examine the effect of structural properties of plain Knit Fabrics on the subjective textures and sensibilities of consumers. We investigated the relationship of subjective textures and sensibilities according to fiber contents of wool/rayon and stitch loop length. We made 20 plain Knit Fabrics, as specimens, with a combination of 5 kinds of fiber contents and 4 kinds of stitch loop length. A factor analysis showed that subjective textures are classified into 3 categories with : 'surface-rough', 'drapable', 'bulky' and 'elastic' and subjective sensibilities into 3 categories with : 'stable/neat', 'feminine/elegant' and 'natural/comfortable'. The fiber contents of wool/rayon had a positive and linear relation with 'surface-rough', but had a relatively non-linear one with 'bulky' and 'elastic' categories of textures, and 'feminine/elegant' of sensibilities. The stitch loop length had a linear influence on 'drapable' and 'stable/neat', but had a non-linear influence on other subjective textures and sensibilities.
Lucy E Dunne - One of the best experts on this subject based on the ideXlab platform.
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effects of the textile sensor interface on stitched strain sensor performance
International Symposium on Wearable Computers, 2019Co-Authors: Ellen Dupler, Lucy E DunneAbstract:The influence of the textile substrate on the performance of a textile-based strain sensor has not been well understood or characterized in many wearable sensor evaluations. The underlying textile has its own anisotropic mechanical behaviors due to its woven or Knit fabrication process, and introduces non-trivial structural influences on integrated wearable strain sensors. This study considers stitched strain sensors of two stitch geometries, fabricated on two different Knit Fabrics, with the sensor stitched in different orientations with respect to the Knit structure. The resulting mechanical and electrical performance is characterized under cyclic extension, as the angle of extension (relative to the fabric) is also incrementally changed. The results illustrate a shift from linear to non-linear mechanical behavior as fabric stiffness increases, and variations in behavior between stitch geometries. Results show that force direction and sensor placement both introduce variability in calculated elastic modulus, which affect sensor modeling (e.g. predicting applied force from sensor response). A novel stitch geometry (the chainstitch sensor) is characterized as having a higher gauge force and lower transverse sensitivity factor than the coverstitch sensor. This work offers insight into the textile-sensor interface and design implications for development of textile-based sensors.
Ellen Dupler - One of the best experts on this subject based on the ideXlab platform.
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effects of the textile sensor interface on stitched strain sensor performance
International Symposium on Wearable Computers, 2019Co-Authors: Ellen Dupler, Lucy E DunneAbstract:The influence of the textile substrate on the performance of a textile-based strain sensor has not been well understood or characterized in many wearable sensor evaluations. The underlying textile has its own anisotropic mechanical behaviors due to its woven or Knit fabrication process, and introduces non-trivial structural influences on integrated wearable strain sensors. This study considers stitched strain sensors of two stitch geometries, fabricated on two different Knit Fabrics, with the sensor stitched in different orientations with respect to the Knit structure. The resulting mechanical and electrical performance is characterized under cyclic extension, as the angle of extension (relative to the fabric) is also incrementally changed. The results illustrate a shift from linear to non-linear mechanical behavior as fabric stiffness increases, and variations in behavior between stitch geometries. Results show that force direction and sensor placement both introduce variability in calculated elastic modulus, which affect sensor modeling (e.g. predicting applied force from sensor response). A novel stitch geometry (the chainstitch sensor) is characterized as having a higher gauge force and lower transverse sensitivity factor than the coverstitch sensor. This work offers insight into the textile-sensor interface and design implications for development of textile-based sensors.
Narayanan Gokarneshan - One of the best experts on this subject based on the ideXlab platform.
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Design of Warp Knit Spacer Fabrics – Recent research insights on technical applications
Journal of textile and apparel technology and management, 2015Co-Authors: Narayanan GokarneshanAbstract:Warp Knit Fabrics are recently being used in technical applications. This paper critically reviews the recent research trends in warp Knit spacer Fabrics intended for various technical applications. When considering areas of applications such as sofas, seat covers, and cushions, warp Knit spacer Fabrics could offer a good substitute for polyurethane foams due to their advantages of combining compressive characteristics, air permeability, and thermoregulation arising out of their 3D structure. The compressive behavior of warp Knit spacer Fabrics has been analyzed under both static and dynamic conditions so as to determine their suitability for protective applications. The sound absorption behaviour of both warp and weft Knitted Fabrics have been studied. The study reveals that fabric surface structure and thickness, spacer yarn type and their connecting ways, fabric combinations and their arrangement methods have significant influence on the sound absorbability. The findings also show that good sound absorbability could be achieved by using Knitted spacer Fabrics when suitable fabric structures and combinations are used. Attempts have been made to study the relationships among the stab resistance and fabric density, thickness and the spacer structure. The results indicate that the thickness and the density of warp Knitted spacer fabric and the compressive of the spacer layer structure are the main influencing factors on the stab resistance. The three layer composite structure of warp Knitted spacer fabric was able to resist the penetration by stages during the penetration process and thereby achieved the objective of multiple protection through the knife self locking, energy dissipation and friction damping.
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design of warp Knit spacer Fabrics recent research insights on technical applications
Journal of textile and apparel technology and management, 2015Co-Authors: Narayanan GokarneshanAbstract:Warp Knit Fabrics are recently being used in technical applications. This paper critically reviews the recent research trends in warp Knit spacer Fabrics intended for various technical applications. When considering areas of applications such as sofas, seat covers, and cushions, warp Knit spacer Fabrics could offer a good substitute for polyurethane foams due to their advantages of combining compressive characteristics, air permeability, and thermoregulation arising out of their 3D structure. The compressive behavior of warp Knit spacer Fabrics has been analyzed under both static and dynamic conditions so as to determine their suitability for protective applications. The sound absorption behaviour of both warp and weft Knitted Fabrics have been studied. The study reveals that fabric surface structure and thickness, spacer yarn type and their connecting ways, fabric combinations and their arrangement methods have significant influence on the sound absorbability. The findings also show that good sound absorbability could be achieved by using Knitted spacer Fabrics when suitable fabric structures and combinations are used. Attempts have been made to study the relationships among the stab resistance and fabric density, thickness and the spacer structure. The results indicate that the thickness and the density of warp Knitted spacer fabric and the compressive of the spacer layer structure are the main influencing factors on the stab resistance. The three layer composite structure of warp Knitted spacer fabric was able to resist the penetration by stages during the penetration process and thereby achieved the objective of multiple protection through the knife self locking, energy dissipation and friction damping.