The Experts below are selected from a list of 3021 Experts worldwide ranked by ideXlab platform
Robert Guidoin - One of the best experts on this subject based on the ideXlab platform.
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Quantitative analysis of the surface morphology and Textile Structure of the Polyurethane Vascugraft® arterial prosthesis using image and statistical analyses
Biomaterials, 1994Co-Authors: Martin W King, Pauline Ukpabi, Ze Zhang, Dennis Murphy, Robert GuidoinAbstract:The surface morphology and Textile Structure of the Vascugraft® polyurethane arterial prosthesis were investigated. Novel methods of image analysis and the presentation of statistical data were used to obtain quantitative results of the surface morphology of the non-woven microfibrous Structure of prostheses of three different sizes. These techniques have identified apparent differences in the distributions of thickness and orientation of the microfibres between the internal and external surfaces and between the three prostheses investigated.
Hong Hu - One of the best experts on this subject based on the ideXlab platform.
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Finite Element Analysis of Three-Dimensional (3D) Auxetic Textile Composite under Compression
Polymers, 2018Co-Authors: Jifang Zeng, Hong HuAbstract:This paper reports a finite element (FE) analysis of three-dimensional (3D) auxetic Textile composite by using commercial software ANSYS 15 under compression. The two-dimensional (2D) FE model was first developed and validated by experiment. Then, the validated model was used to evaluate effects of structural parameters and constituent material properties. For the comparison, 3D non-auxetic composite that was made with the same constituent materials and structural parameters, but with different yarn arrangement in the Textile Structure was also analyzed at the same time. The analysis results showed that the auxetic and non-auxetic composites have different compression behaviors and the auxetic composite has better the energy absorption capacity than the non-auxetic composite under the same compression stress. The study has provided us a guidance to design and fabricate auxetic composites with the required mechanical behavior by appropriately selecting structural parameters and constituent materials.
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auxetic composites made of 3d Textile Structure and polyurethane foam
Physica Status Solidi B-basic Solid State Physics, 2016Co-Authors: Lin Zhou, Lili Jiang, Hong HuAbstract:Auxetic composites have attracted considerable attention in recent years and have demonstrated a high potential of applications in different areas due to their wonderful properties as compared to non-auxetic composites. In this study, a three-dimensional (3D) auxetic Textile Structure previously developed was used as reinforcement to fabricate auxetic composites with conventional polyurethane (PU) foam. Both the deformation behavior and mechanical properties of the auxetic composites under compression were analyzed and compared with those of the pure PU foam and non-auxetic composites made with the same materials and structural parameters but with different yarn arrangement. The results show that the negative Poisson's ratio of composites can be obtained when suitable yarn arrangement in a 3D Textile Structure is adopted. The results also show that the auxetic composites and non-auxetic composites have different mechanical behaviors due to different yarn arrangements in 3D Textile Structure. While the auxetic composites behave more like damping material with lower compression stress, the non-auxetic composite behaves more like stiffer material with higher compression stress. It is expected that this study could pave a way to the development of innovative 3D auxetic Textile composites for different potential applications such as impact protection.
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numerical analysis of deformation behavior of a 3d Textile Structure with negative poisson s ratio under compression
Textile Research Journal, 2015Co-Authors: Zhaoyang Ge, Hong HuAbstract:A numerical analysis using the finite element (FE) method was conducted to investigate the deformation behavior of a novel three-dimensional (3D) Textile Structure made by a special arrangement of the weft and warp yarns in a 3D orthogonal Structure to achieve negative Poisson’s ratio (NPR). The minimum number of unit cells required for the FE analysis was first determined by comparing the calculating results of Poisson’s ratio values based on the FE models built with fixed structural parameters and yarn properties. Then Poisson’s ratio values of the 3D Textile Structure with different structural parameters and yarn properties under compression were calculated using the FE models built with the determined unit cells. The calculating results show that the 3D Structure can achieve NPR in one direction if the weft and warp yarns used have different bending stiffness and radii. This numerical analysis can provide useful information for the design and fabrication of this kind of 3D Textile Structure, which has...
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Numerical analysis of deformation behavior of a 3D Textile Structure with negative Poisson’s ratio under compression:
Textile Research Journal, 2014Co-Authors: Zhaoyang Ge, Hong HuAbstract:A numerical analysis using the finite element (FE) method was conducted to investigate the deformation behavior of a novel three-dimensional (3D) Textile Structure made by a special arrangement of the weft and warp yarns in a 3D orthogonal Structure to achieve negative Poisson’s ratio (NPR). The minimum number of unit cells required for the FE analysis was first determined by comparing the calculating results of Poisson’s ratio values based on the FE models built with fixed structural parameters and yarn properties. Then Poisson’s ratio values of the 3D Textile Structure with different structural parameters and yarn properties under compression were calculated using the FE models built with the determined unit cells. The calculating results show that the 3D Structure can achieve NPR in one direction if the weft and warp yarns used have different bending stiffness and radii. This numerical analysis can provide useful information for the design and fabrication of this kind of 3D Textile Structure, which has...
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a finite element analysis of a 3d auxetic Textile Structure for composite reinforcement
Smart Materials and Structures, 2013Co-Authors: Zhaoyang Ge, Hong HuAbstract:This paper reports the finite element analysis of an innovative 3D auxetic Textile Structure consisting of three yarn systems (weft, warp and stitch yarns). Different from conventional 3D Textile Structures, the proposed Structure exhibits an auxetic behaviour under compression and can be used as a reinforcement to manufacture auxetic composites. The geometry of the Structure is first described. Then a 3D finite element model is established using ANSYS software and validated by the experimental results. The deformation process of the Structure at different compression strains is demonstrated, and the validated finite element model is finally used to simulate the auxetic behaviour of the Structure with different structural parameters and yarn properties. The results show that the auxetic behaviour of the proposed Structure increases with increasing compression strain, and all the structural parameters and yarn properties have significant effects on the auxetic behaviour of the Structure. It is expected that the study could provide a better understanding of 3D auxetic Textile Structures and could promote their application in auxetic composites.
Zhaoyang Ge - One of the best experts on this subject based on the ideXlab platform.
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numerical analysis of deformation behavior of a 3d Textile Structure with negative poisson s ratio under compression
Textile Research Journal, 2015Co-Authors: Zhaoyang Ge, Hong HuAbstract:A numerical analysis using the finite element (FE) method was conducted to investigate the deformation behavior of a novel three-dimensional (3D) Textile Structure made by a special arrangement of the weft and warp yarns in a 3D orthogonal Structure to achieve negative Poisson’s ratio (NPR). The minimum number of unit cells required for the FE analysis was first determined by comparing the calculating results of Poisson’s ratio values based on the FE models built with fixed structural parameters and yarn properties. Then Poisson’s ratio values of the 3D Textile Structure with different structural parameters and yarn properties under compression were calculated using the FE models built with the determined unit cells. The calculating results show that the 3D Structure can achieve NPR in one direction if the weft and warp yarns used have different bending stiffness and radii. This numerical analysis can provide useful information for the design and fabrication of this kind of 3D Textile Structure, which has...
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Numerical analysis of deformation behavior of a 3D Textile Structure with negative Poisson’s ratio under compression:
Textile Research Journal, 2014Co-Authors: Zhaoyang Ge, Hong HuAbstract:A numerical analysis using the finite element (FE) method was conducted to investigate the deformation behavior of a novel three-dimensional (3D) Textile Structure made by a special arrangement of the weft and warp yarns in a 3D orthogonal Structure to achieve negative Poisson’s ratio (NPR). The minimum number of unit cells required for the FE analysis was first determined by comparing the calculating results of Poisson’s ratio values based on the FE models built with fixed structural parameters and yarn properties. Then Poisson’s ratio values of the 3D Textile Structure with different structural parameters and yarn properties under compression were calculated using the FE models built with the determined unit cells. The calculating results show that the 3D Structure can achieve NPR in one direction if the weft and warp yarns used have different bending stiffness and radii. This numerical analysis can provide useful information for the design and fabrication of this kind of 3D Textile Structure, which has...
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a finite element analysis of a 3d auxetic Textile Structure for composite reinforcement
Smart Materials and Structures, 2013Co-Authors: Zhaoyang Ge, Hong HuAbstract:This paper reports the finite element analysis of an innovative 3D auxetic Textile Structure consisting of three yarn systems (weft, warp and stitch yarns). Different from conventional 3D Textile Structures, the proposed Structure exhibits an auxetic behaviour under compression and can be used as a reinforcement to manufacture auxetic composites. The geometry of the Structure is first described. Then a 3D finite element model is established using ANSYS software and validated by the experimental results. The deformation process of the Structure at different compression strains is demonstrated, and the validated finite element model is finally used to simulate the auxetic behaviour of the Structure with different structural parameters and yarn properties. The results show that the auxetic behaviour of the proposed Structure increases with increasing compression strain, and all the structural parameters and yarn properties have significant effects on the auxetic behaviour of the Structure. It is expected that the study could provide a better understanding of 3D auxetic Textile Structures and could promote their application in auxetic composites.
Thomas Gries - One of the best experts on this subject based on the ideXlab platform.
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10 – Polymer-optical fibre (POF) integration into Textile fabric Structures
Polymer Optical Fibres, 2017Co-Authors: V. Schrank, Marion Beckers, Martin Beer, Thomas GriesAbstract:One major advantage of polymer-optical fibre (POF) material is its yarn-like character. Therefore, POF can be processed into various Textile Structures. To highlight some of these possibilities, this chapter gives a short overview of classic Textile fabric production technologies. Besides the Textile Structure and the manufacturing process, possibilities and limitations of the forming process are given. Additionally, further literature information for each fabric technology is provided.
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Application of Polyvinylidene Fluoride (PVDF) as a Biomaterial in Medical Textiles
Medical and Healthcare Textiles, 2010Co-Authors: Stéphanie Houis, E. M. Engelhardt, Frederik Wurm, Thomas GriesAbstract:Textile implants so called scaffolds are used for the reinforcement of tissue on the one hand and cell guidance on the other hand with the goal to support regeneration of new tissue. Different factors strongly influence cell ingrowth of the scaffold namely the fibre material the fibre Structure and the Textile Structure. Depending on the final application of a Textile scaffold warp knitting weavingbraiding and non-woven technologies can be used to manufacture the Textile Structure. Thermal treatment can be applied to adjust the porosity geometry and elasticity of the produced Textiles.At the Institut für Texiltechnik at RWTH Aachen University (RWTH-ITΑ) polyvinylidene fluoride (PVDF) is used as a non-degradable and biocompatible polymer. PVDF shows very good biocompatibility and even bioneutrality.For the application in medical products, the PVDF is spun by a melt spinning process. In addition to multi- and monofilament also bicomponent fibres can be produced. Multifilaments are subject of currently carried out studies at the ITA.These multifilaments are used for medical applications like vascular grafts, ligament and artificial cornea. The artificial cornea is presented in detail.In another study, scaffolds made out of PVDF fibres with varying diameter and cross section are produced. The influence of the miscellaneous scaffolds on cell adhesion is then investigated. © 2010 Woodhead Publishing Limited. All rights reserved.
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Technical Textiles: Warp-knitted fabrics with great development potential: Warp-knitted Nitinol Structures for use as stents
Kettenwirk-Praxis, 2006Co-Authors: Florent Budillon, Klaus Neuking, Thomas Gries, Gunther EggelerAbstract:The Institute for Textile Technology at the RWTH Aachen undertook a joint project with the Research Group for Materials Science at the Ruhr University, Bochum to study the use of warp-knitted Structures made from Nitinol in stents. The stents were produced using KARL MAYER's DR 16 EEC ST double-bar raschel machine. Following stents production, the Nitinol Textile Structure was fixed into its final shape. The resultant knitted Structure is a circular, warp-knitted, double-tricot construction comprising 32 Nitinol wires, type SE 50 μm. A tensile tester revealed that the knitted Textile has comparable performance with the laser-cut stent.
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Coated Textile to be used in measuring the reinforcement of concrete construction units
DWI Reports, 2006Co-Authors: M Barle, Thomas GriesAbstract:The use of raw, uncoated reinforcement Textiles in manufacturing concrete construction units requires a high degree of caution in the application of Textiles. Coatings are used to improve manageability. They provide high displacement strength to the Textile Structure. In addition, coatings can be used to maintain a specific distance between the Textile and formwork. Thus, Textiles can be enclosed completely by concrete so that they do not become visible later in surface of the concrete elements. The use of measuring rods and the confection of Textile reinforcing cages also affects concreting procedures. Textile Structure and concreting procedures must be adjusted carefully to one another. Currently, the AiF research project focuses its project "Serial individual manufacturing (piece manufacturing) of construction units from Textile-reinforced by construction units from concrete," AiF No. 14441, on this topic.
Cristian Jipa - One of the best experts on this subject based on the ideXlab platform.
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Solutions in Designing of the Composite Textile Structure Destined to Block, Intake and Storage of the Petroleum Residues Due to Natural Disasters
Advances in Design for Inclusion, 2020Co-Authors: Carmen Mihai, Alexandra Ene, Emilia Visileanu, Cristian JipaAbstract:To floating dams for limiting the expansion of the hydrocarbon film to the sea surface, different physicochemical processes are used which consist in the gelation of the marginal portion of the oil film by polymerization or by the dispersal of various products that prevent the expansion of the oil pan by altering superficial tension contact oil.For the design of the composite Structure destined to the blocking, capture and storage of the oil fractions, several structural analyses has been performed by considering the initial conditions differentiated as a function of wind force measured on Beaufort Scale.In this respect, a specialized software that allows the setting of calculation parameters, performing actual calculations, processing, visualization and export of numerical data was used.The structural analysis was based on the theories of continuous medium mechanics.The values resulting from the structural analysis for: structural deformation, Von Mises stress values, displacement vectors, as well as those resulting from the use of membrane theory, allowed the determination of the structural parameters necessary for the design of the Textile Structure.
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Solutions in Designing of the Composite Textile Structure Destined to Block, Intake and Storage of the Petroleum Residues Due to Natural Disasters
Advances in Intelligent Systems and Computing, 2019Co-Authors: Carmen Mihai, Emilia Visileanu, Cristian JipaAbstract:To floating dams for limiting the expansion of the hydrocarbon film to the sea surface, different physicochemical processes are used which consist in the gelation of the marginal portion of the oil film by polymerization or by the dispersal of various products that prevent the expansion of the oil pan by altering superficial tension contact oil.