The Experts below are selected from a list of 6090 Experts worldwide ranked by ideXlab platform

Seeram Ramakrishna - One of the best experts on this subject based on the ideXlab platform.

  • structure tensile property relationship of Knitted Fabric composites
    Polymer Composites, 2001
    Co-Authors: T B Bini, Seeram Ramakrishna, Zhengming Huang
    Abstract:

    This paper reports some further studies on the tensile properties of plain weft Knitted DuPont Kevlar fiber Fabric reinforced epoxy matrix composites. One aim of this work is to investigate systematically the anisotropy of Knitted Fabric composites. Tensile tests were conducted at different off-axial angles (0°, 30°, 45°, 60° and 90°) with respect to the wale direction. Fracture modes corresponding to this off-axial variation were clearly identified. The elastic modulus and tensile strength were found to be the highest in the wale direction (0°), but decreased gradually towards the course direction (90°). This anisotropic study was carried out on both single layered and multilayered (four layered) Knitted Fabric composites. Another aim is to study the effect of specimen width (or number of loops per specimen width) on the tensile properties. This study indicated an optimum number of loops per sample width required to obtain meaningful tensile test results. Further, edge effect on the tensile properties of the Knitted Fabric composites was also investigated in the paper. This was achieved through comparative studies on cut and uncut four layered specimens. In the cut specimens the continuity of the yarns is lost at the cut edges, which show a marginal variation in the properties compared with the uncut specimens where the yarns are continuous throughout the specimen. Finally, a study was also carried out to investigate the effect of loop size (or stitch density) on the tensile strength and stiffness of the single layered composites.

  • electromagnetic shielding effectiveness of copper glass fiber Knitted Fabric reinforced polypropylene composites
    Composites Part A-applied Science and Manufacturing, 2000
    Co-Authors: K. B. Cheng, Seeram Ramakrishna
    Abstract:

    The main objectives of this research work are to develop conductive Knitted Fabric composite materials and to determine their electromagnetic shielding effectiveness (EMSE). Polypropylene is the matrix phase and glass fibers are the reinforcement phase of the composite material. Copper wires are incorporated as conductive fillers to provide the electromagnetic shielding properties of the composite material. The amount of copper in the composite material is varied by changing the yarn composition, Fabric knit structure and stitch density. The EMSE of various Knitted Fabric composites is measured in the frequency range of 300 kHz to 3 GHz. The variations of EMSE of Knitted Fabric composites with Fabric structure, stitch density and yarn compositions are described. Suitability of conductive Knitted Fabric composites for electromagnetic shielding applications is also discussed.

  • development of conductive Knitted Fabric reinforced thermoplastic composites for electromagnetic shielding applications
    Journal of Thermoplastic Composite Materials, 2000
    Co-Authors: K Cheng, Seeram Ramakrishna, K C Lee
    Abstract:

    This paper presents a feasibility study to develop conductive Knitted-Fabric-reinforced thermoplastic composites for electromagnetic shielding applications. Polypropylene is the matrix phase, and glass fibers are the reinforcement phase of the composite material. Stainless steel wires and staple yarns are incorporated as conductive fillers to facilitate the electromagnetic shielding properties of the composite material. Owing to their high stiffness, knitting of glass fibers and stainless steel wires is very difficult. To facilitate the knitting, uncommingled yarns comprising stainless steel wires, glass, and polypropylene fibers are produced using a hollow spindle spinning method. Different kinds of weft Knitted Fabrics are produced, which are subsequently consolidated into composite materials using a compression molding method. The electromagnetic shielding effectiveness (EMSE) of various Knitted composites is measured in the frequency range of 300 kHz to 3 GHz. The variations of EMSE of Knitted composi...

  • effect of textile geometry on axisymmetric stretch forming of Knitted Fabric composites
    Proceedings of the Institution of Mechanical Engineers Part B: Journal of Engineering Manufacture, 2000
    Co-Authors: Seeram Ramakrishna, H M Shang
    Abstract:

    AbstractPlain weft-Knitted Fabrics are known for their excellent quality to stretch and drape around a convex surface without wrinkling. In recent years, sheet forming of Knitted Fabric composites has been investigated in view of promising future applications. In this paper a prediction of attainable shell height is proposed with reference to the textile geometry and the tool profile. Comparison between the measured and predicted shell heights shows reasonable agreement. The present analysis should provide a guideline for manufacturers in selecting the appropriate textile geometry for satisfactory stretch forming operations of Knitted Fabric composites.

K H Leong - One of the best experts on this subject based on the ideXlab platform.

  • a study of damage development in a weft Knitted Fabric reinforced composite part 1 experiments using model sandwich laminates
    Composites Part A-applied Science and Manufacturing, 2007
    Co-Authors: C R Rios, S L Ogi, C Lekakou, K H Leong
    Abstract:

    Coupons consisting of single layers of Milano weft Knitted glass Fabric reinforced epoxy resin have been tested with the Knitted Fabric oriented at various angles to the loading direction, alone and sandwiched between outer layers of unidirectional glass/epoxy reinforcement. The sandwich coupons enable the initiation of damage to be observed directly. Tensile tests have shown that the first damage occurs as microdebonding between the loop cross-over points in the Knitted Fabric structure. Matrix cracking damage develops from these initiation sites and the pattern of cracking is intimately related to the Fabric architecture and the Fabric orientation with respect to the loading direction. Cyclic tests of sandwich specimens, and a representation of the results in terms of cumulative strain, indicate that some of the acoustic emission activity during loading and unloading of the specimens is likely to be associated with the debonding and pulling-out of Knitted Fabric tows across the fracture surfaces of the matrix cracks.

  • impact and compression after impact performance of weft Knitted glass textile composites
    Composites Part A-applied Science and Manufacturing, 2005
    Co-Authors: O A Khondker, K H Leong, I Herszberg, Hiroyuki Hamada
    Abstract:

    Abstract This research dealt with the impact resistance and tolerance of composite materials manufactured from weft-Knitted E-glass Fabrics. Three different styles of the weft-knit structures, Milano, 1×1 rib and plain knit, were investigated together with two further variations of Milano and rib structure and one variation of plain knit. The effect of weft-Knitted Fabric style and knit- structural parameters upon the impact and compression-after-impact properties of the weft-Knitted composites was examined. Damage morphology and failure mechanisms of the impacted materials were characterised. It has been found that both changes to the knit style and structural parameters affected the damage resistance and tolerance of composites. A knit structure having a higher value of total loop density has effectively incorporated better Knitted-mesh generation within the structure, thereby enhancing the structural integrity of composites and offered better impact damage resistance and tolerance.

C H Au - One of the best experts on this subject based on the ideXlab platform.

  • effect of biopolishing and uv absorber treatment on the uv protection properties of cotton Knitted Fabrics
    Carbohydrate Polymers, 2014
    Co-Authors: C H Au
    Abstract:

    Abstract Cotton Knitted Fabrics were manufactured with gauge number 20 G by circular knitting machine with conventional ring spun yarn and torque-free ring spun yarn. Torque-free ring spinning is a new spinning technology that produces yarns with low twist and balanced torque. This study examined whether the impact of biopolishing and UV absorber treatment on UV protection properties on cotton Knitted Fabric made of torque-free ring spun yarn is different. Biopolishing agent and UV absorber were used to treat the cotton Knitted Fabrics after scouring and bleaching. The UV protection properties were measured in terms of UV protection factor (UPF) and UV ray transmittance. Experimental results revealed that Knitted Fabric made from torque-free ring spun has better UPF than Knitted Fabric made from conventional ring spun yarn in untreated and biopolished states. However, Knitted Fabric made from conventional ring spun yarn has better UPF than Knitted Fabric made from torque-free ring spun after UV absorber treatment and combined UV absorber and biopolishing treatment.

Suganthi T - One of the best experts on this subject based on the ideXlab platform.

  • Influence of tuck stitch in course direction on thermal comfort characteristics of layered Knitted Fabrics
    Indian Journal of Fibre & Textile Research (IJFTR), 2019
    Co-Authors: Senthilkuma P, Suganthi T
    Abstract:

    The thermal comfort characteristics of bi-layer Knitted Fabrics have been studied for shuttle badminton sportswear. BilayerKnitted Fabrics are developed by changing tuck position in course direction such as 6, 10, 14 and 18 course repeat,keeping the tuck on 12th wale the same. It is observed that the greater the distance between successive tuck points, the betterwill be the air, heat and moisture transfer properties. Bi-layer Knitted Fabric with slack structure facilitates lower thicknessand mass per unit area, and exhibits better thermal comfort characteristics. By wear trial method, bi-layer Knitted Fabric withtuck on 18th course and 12th wale shows good rating compared to other bi-layer Knitted Fabrics. The results are discussed at95% significant level with ANOVA analysis and Friedman one-way analysis of variance

  • Influence of tuck stitch in wale direction on thermal comfort characteristics of layered Knitted Fabrics
    NISCAIR-CSIR India, 2019
    Co-Authors: Senthilkuma P, Suganthi T
    Abstract:

    65-74Thermo-physiological comfort of the clothing has been studied considering the ability to manage heat and to transfer sensible and insensible perspiration to the environment. Four bi-layer Knitted Fabrics are developed by changing the tuck stitch placement in four different points on wale, such as tuck on 4th, 8th, 12th and 16th wale with same course. It is observed that the bi-layer Knitted Fabric with tuck on 12th wale exhibits better air, heat and moisture transfer as compared to those with tuck on 4th, 8th, and 16th wales. The lower thickness and low mass per unit area exhibit better thermal conductivity, air permeability, water vapour permeability, wicking, moisture absorbency, drying rate and moisture management properties. The less number of tuck stitch shows better thermal comfort characteristics considering both objective and wear trial method. The results are discussed with 95% significant level with ANOVA analysis and Friedman one-way analysis of variance

  • Comfort properties of double face Knitted Fabrics for tennis sportswear
    Indian Journal of Fibre & Textile Research (IJFTR), 2018
    Co-Authors: Suganthi T, Senthilkuma P
    Abstract:

    The comfort properties of different bi-layer Knitted structures made from tencel yarn as an outer layer and acrylic/micro-fibre polyester yarn as an inner layer have been studied. Six union Fabrics have been produced and then analyzed objectively and subjectively for their comfort properties. The air permeability, water vapour permeability, wicking ability and drying rate are found to be higher and thermal resistance is found to be lower for bi-layer Knitted Fabric made out of micro-fibre polyester (inner layer) with less tuck points as compared to all other Fabrics. The same structure shows good ranking on subjective rating of thermal environment scale. The results are discussed with 95% significant level with ANOVA analysis and Friedman one-way analysis of variance

Senthilkuma P - One of the best experts on this subject based on the ideXlab platform.

  • Influence of tuck stitch in course direction on thermal comfort characteristics of layered Knitted Fabrics
    Indian Journal of Fibre & Textile Research (IJFTR), 2019
    Co-Authors: Senthilkuma P, Suganthi T
    Abstract:

    The thermal comfort characteristics of bi-layer Knitted Fabrics have been studied for shuttle badminton sportswear. BilayerKnitted Fabrics are developed by changing tuck position in course direction such as 6, 10, 14 and 18 course repeat,keeping the tuck on 12th wale the same. It is observed that the greater the distance between successive tuck points, the betterwill be the air, heat and moisture transfer properties. Bi-layer Knitted Fabric with slack structure facilitates lower thicknessand mass per unit area, and exhibits better thermal comfort characteristics. By wear trial method, bi-layer Knitted Fabric withtuck on 18th course and 12th wale shows good rating compared to other bi-layer Knitted Fabrics. The results are discussed at95% significant level with ANOVA analysis and Friedman one-way analysis of variance

  • Influence of tuck stitch in wale direction on thermal comfort characteristics of layered Knitted Fabrics
    NISCAIR-CSIR India, 2019
    Co-Authors: Senthilkuma P, Suganthi T
    Abstract:

    65-74Thermo-physiological comfort of the clothing has been studied considering the ability to manage heat and to transfer sensible and insensible perspiration to the environment. Four bi-layer Knitted Fabrics are developed by changing the tuck stitch placement in four different points on wale, such as tuck on 4th, 8th, 12th and 16th wale with same course. It is observed that the bi-layer Knitted Fabric with tuck on 12th wale exhibits better air, heat and moisture transfer as compared to those with tuck on 4th, 8th, and 16th wales. The lower thickness and low mass per unit area exhibit better thermal conductivity, air permeability, water vapour permeability, wicking, moisture absorbency, drying rate and moisture management properties. The less number of tuck stitch shows better thermal comfort characteristics considering both objective and wear trial method. The results are discussed with 95% significant level with ANOVA analysis and Friedman one-way analysis of variance

  • Comfort properties of double face Knitted Fabrics for tennis sportswear
    Indian Journal of Fibre & Textile Research (IJFTR), 2018
    Co-Authors: Suganthi T, Senthilkuma P
    Abstract:

    The comfort properties of different bi-layer Knitted structures made from tencel yarn as an outer layer and acrylic/micro-fibre polyester yarn as an inner layer have been studied. Six union Fabrics have been produced and then analyzed objectively and subjectively for their comfort properties. The air permeability, water vapour permeability, wicking ability and drying rate are found to be higher and thermal resistance is found to be lower for bi-layer Knitted Fabric made out of micro-fibre polyester (inner layer) with less tuck points as compared to all other Fabrics. The same structure shows good ranking on subjective rating of thermal environment scale. The results are discussed with 95% significant level with ANOVA analysis and Friedman one-way analysis of variance