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Tongxi Yu - One of the best experts on this subject based on the ideXlab platform.
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tensile properties and meso scale mechanism of weft knitted textile composites for energy absorption
Composites Part A-applied Science and Manufacturing, 2002Co-Authors: Tongxi YuAbstract:Abstract The investigation on large deformation tensile properties and the relevant meso-scale mechanisms of weft knitted textile composites is presented. The correlation between Fabric Structure (e.g. loop height and width, number of wale or course per unit length, etc.), matrix damage and material properties are described. Weft knitted Fabrics with 1×1 interlock Structure were used as the preform for the composites. The materials studied include knitted nylon Fabric/unsaturated polyester resin and co-knitted polyethylene terephthalate (PET)/polypropylene (PP) textile composites. The results show that all the nylon/polyester thermoset textile composites samples displayed an ideal bi-linear character in their tensile stress–strain curves, whilst the tensile curves of PET/PP co-knitted thermoplastic samples along the wale, course and 45° directions are all significantly non-linear. The tensile behavior is superior in the wale direction to those in the course and 45° directions. The deformation mechanisms in meso-scale were identified experimentally by in-situ observation of large deformation process for both thermoset matrix and thermoplastic matrix textile composites. For the nylon/polyester composite samples, the non-linear properties mainly come from the change in the configuration of the Fabric Structure during extension. For the PET/PP co-knitted textile composite samples, the inelastic properties are attributed to the damage evolution in the matrix, interface damage between fiber bundle and matrix, sliding between the wales of the knitted Fabric, as well as the change in the configuration of the Fabric Structure during loading.
Ali A A Jeddi - One of the best experts on this subject based on the ideXlab platform.
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the effect of Fabric Structure on the mechanical properties of warp knitted surgical mesh for hernia repair
Journal of The Mechanical Behavior of Biomedical Materials, 2017Co-Authors: Mohammad Mirjavan, Azita Asayesh, Ali A A JeddiAbstract:Abstract Surgical mesh is being used for healing hernia, pelvic organ prolapse, skull injuries and urinary incontinence. In this research the effect of Fabric Structure on the mechanical properties of warp knitted surgical meshes in comparison to abdominal fascia has been investigated. For this purpose, warp knitted surgical mesh with five different Structures (Tricot, Pin-hole-net, quasi-Sandfly, Sandfly and quasi-Marquissite) were produced using polypropylene monofilament. Thereafter, their mechanical properties such as uniaxial tensile behavior in various directions (wale-wise (90°), course-wise (0°) and diagonal (45°)), bending resistance and crease recovery were analyzed. The meshes demonstrated different elastic modulus in various directions, which can be attributed to the pore shape (pore angle) and underlap angle in the Structure of mesh. Except Pin-hole-net mesh, other produced meshes exhibited better level of orthotropy in comparison to abdominal fascia. The most flexible mesh in both wale-wise and course-wise directions was quasi-Sandfly and thereafter quasi-Marquissite. Tricot and Pin-hole-net manifested the highest crease recovery in wale-wise and coursewise directions respectively. The most desirable mesh in terms of porosity was quasi-Marquissite mesh. Overall, the quasi-Marquissite mesh was selected as the most suitable surgical mesh considering all advantages and disadvantages of each produced mesh in this study.
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analysis of warp knitted Fabric Structure part v experimental study on the initial modulus of warp knitted Fabrics
Journal of The Textile Institute, 2013Co-Authors: Hadi Dabiryan, Ali A A Jeddi, Abbas RastgooAbstract:In the previous parts of this series, tensile properties of warp knitted Fabrics were investigated using energy method. For this purpose, the geometry of fully threaded two-guide bar Structures, i.e. tricot, locknit, reverse locknit, satin and sharkskin were modeled by considering the Fabric density, yarn diameter and the number of front and back bar underlaps. Then, the theoretical models for the initial modulus of aforementioned Structures were obtained. In the present study, the initial modulus of actual Fabrics has been calculated using presented models in previous parts. Then, a new test method was defined for tensile testing of warp knitted Fabric, specifically. Thereafter, the initial modulus of prepared samples has been measured by using tensile tester in order to compare with theoretical values, based on derived test conditions. Reasonable agreements between theoretical and experimental results showed that generated models are capable to predict the initial modulus of fully threaded two-guide bar...
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analysis of warp knitted Fabric Structure part iv modeling the initial poisson s ratio in elastic deformation region
Journal of The Textile Institute, 2012Co-Authors: Hadi Dabiryan, Ali A A JeddiAbstract:The effect of Poisson’s ratio on the mechanical properties of Fabrics is undeniable. In the present study, a geometrical model for the Poisson’s ratio of two-guide-bar warp-knitted Fabrics is developed, based on the presented models in the previous parts of this series. For this purpose, warp-knitted Fabrics are categorized into two groups, according to their Structures. Thereafter, a geometrical model is presented to predict the Poisson’s ratio of each group. To verify the generated models, theoretical results are compared with the available experimental data. The results show that the generated models are a suitable guidance to consider the Poisson’s ratio of warp-knitted Fabrics.
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analysis of warp knitted Fabric Structure part i a 3d straight line model for warp knitted Fabrics
Journal of The Textile Institute, 2011Co-Authors: Hadi Dabiryan, Ali A A JeddiAbstract:It is clear that the geometry of Fabrics has an important role in their properties. Hence, to predict the behavior of Fabrics, it is essential to define a suitable geometrical model. The Structure of warp knitted Fabrics is more complex than other Fabrics. Therefore, to investigate the behavior of warp knitted Structures, we need to define a simple model. The aim of this paper is to present a 3D straight line model for two‐guide‐bar warp knitted Fabrics. To verify the suggested model, geometrical parameters, i.e. run‐in and weight per unit area of different samples were used. The investigation showed that in comparison to previous loop models, results of the straight line model correspond more to the experimental values. It is concluded that a straight line model can predict satisfactory geometrical properties of two‐guide‐bar warp knitted Fabrics.
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relations between Fabric Structure and friction part iii warp knitted Fabrics
Journal of The Textile Institute, 2004Co-Authors: Ali A A Jeddi, Anfal Arshi, V Maleki, V FakhrAbstract:Abstract In earlier parts of the series, we investigated the influence of the woven and weft knitted Fabric Structures on their frictional characteristics, and then defined new indices as the Fabric—structural—asperity index (FSAI). In this paper, we have developed this index for warp-knitted Fabric Structures, to explain the frictional behavior of Fabrics. For this purpose, four different Structures of warp knitted Fabrics were produced, such as Queen's Cord, Tricot, Locknit, and Satin that have 0, 1, 2, and 3 underlaps in their front guide bar, respectively. Two of these Structures, i.e., Tricot and Locknit, were also knitted in two different densities. Next, the frictional forces measurement was carried out on the Fabricsinfivedifferentdirections, suchaswale-over-wale, course-over-course, underlap-over-underlap, underlap-against-underlap, and perpendicular direction to underlap-over-underlap. The experimental results showed that the indices of warp knitted Fabrics (FSAI) have a good relation with frict...
A Bentur - One of the best experts on this subject based on the ideXlab platform.
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Fabric Structure and its reinforcing efficiency in textile reinforced cement composites
Composites Part A-applied Science and Manufacturing, 2003Co-Authors: Alva Peled, A BenturAbstract:In polymer matrices reinforced with Fabrics, the effectiveness of the reinforcement is reduced when the yarns do not maintain a straight geometry. In cement composites, this concept may not be adequate since the nature of the interaction between the cement matrix and the Fabric and its individual yarns is more complex, as concluded from pullout tests. The present paper discusses the bulk properties and geometrical characteristics of textile Fabrics that need to be considered in order to predict the performance of cement composites reinforced with textile Fabrics. It was found that the geometry of a given Fabric could enhance the bonding and enable one to obtain strain hardening behavior from low modulus yarn Fabrics, due to the special shape of the yarn induced by the Fabric. On the other hand, variations of the geometry in a Fabric could drastically reduce the efficiency, resulting in a lower strengthening effect of the yarns in the Fabric, relative to single yarns not in a Fabric form. Therefore, in cement composites the Fabrics cannot be viewed simply as a means for holding together continuous yarns to be readily placed in the matrix, as is the case in composites with polymer matrix.
Seeram Ramakrishna - One of the best experts on this subject based on the ideXlab platform.
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electromagnetic shielding effectiveness of copper glass fiber knitted Fabric reinforced polypropylene composites
Composites Part A-applied Science and Manufacturing, 2000Co-Authors: K. B. Cheng, Seeram RamakrishnaAbstract: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.
Kadir Bilisik - One of the best experts on this subject based on the ideXlab platform.
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Properties of yarn pull-out in para-aramid Fabric Structure and analysis by statistical model
Composites Part A: Applied Science and Manufacturing, 2011Co-Authors: Kadir BilisikAbstract:The aim of this study is to analyze and determine the pull-out properties of para-aramid woven Fabrics. Para-aramid Kevlar29® and Kevlar129® woven Fabrics were used to conduct the pull-out tests. They have high and low Fabric densities. A yarn pull-out fixture was developed to test various Fabric sample dimensions. Data generated from single and multiple yarn pull-out tests in various dimensions of Kevlar29® and Kevlar129® woven Fabrics included Fabric pull-out forces, yarn crimp extensions in the Fabrics and Fabric displacements. The regression model showed that yarn pull-out forces depend on Fabric density, Fabric sample dimensions and the number of pulled ends in the Fabric. Yarn crimp extensions depend on the crimp ratios of the Fabric and Fabric density. Fabric displacements depend on Fabric sample dimensions and the number of pulled yarns.
