Bibliographies thématiques / Flexible yarn

Littérature scientifique sur le sujet « Flexible yarn »

Auteur : Grafiati
Publié le 20 juillet 2024

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Articles de revues sur le sujet "Flexible yarn"

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Dai, Zhang, Fangfang Yan, Mei Qin et Xu Yan. « Fabrication of flexible SiO2 nanofibrous yarn via a conjugate electrospinning process ». e-Polymers 20, no 1 (27 octobre 2020) : 600–605. http://dx.doi.org/10.1515/epoly-2020-0063.

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AbstractNowadays, different kinds of polymers, including ceramics, are electrospun into fibrous materials with different structures by electrospinning. Generally, the as-spun ceramic fibers are randomly oriented membranes and brittle without flexibility. Here, we report the fabrication of flexible SiO2 electrospun yarns using poly(vinyl alcohol) (PVA) as a template through a conjugate electrospinning process and calcination. It was found that the calcined as-spun fibers and yarns are obviously thinned with PVA component removal. Fourier transform infrared spectroscopy and energy-dispersive spectroscopy examinations suggested that the obtained yarn after calcination was SiO2 yarn. The SiO2 yarn showed good flexibility without cracking after 180° bending. The flexible ceramic yarn may have potential application in functional textiles.
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Lugoda, Pasindu, Julio C. Costa, Carlos Oliveira, Leonardo A. Garcia-Garcia, Sanjula D. Wickramasinghe, Arash Pouryazdan, Daniel Roggen, Tilak Dias et Niko Münzenrieder. « Flexible Temperature Sensor Integration into E-Textiles Using Different Industrial Yarn Fabrication Processes ». Sensors 20, no 1 (21 décembre 2019) : 73. http://dx.doi.org/10.3390/s20010073.

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Textiles enhanced with thin-film flexible sensors are well-suited for unobtrusive monitoring of skin parameters due to the sensors’ high conformability. These sensors can be damaged if they are attached to the surface of the textile, also affecting the textiles’ aesthetics and feel. We investigate the effect of embedding flexible temperature sensors within textile yarns, which adds a layer of protection to the sensor. Industrial yarn manufacturing techniques including knit braiding, braiding, and double covering were utilised to identify an appropriate incorporation technique. The thermal time constants recorded by all three sensing yarns was <10 s. Simultaneously, effective sensitivity only decreased by a maximum of 14% compared to the uncovered sensor. This is due to the sensor being positioned within the yarn instead of being in direct contact with the measured surface. These sensor yarns were not affected by bending and produced repeatable measurements. The double covering method was observed to have the least impact on the sensors’ performance due to the yarn’s smaller dimensions. Finally, a sensing yarn was incorporated in an armband and used to measure changes in skin temperature. The demonstrated textile integration techniques for flexible sensors using industrial yarn manufacturing processes enable large-scale smart textile fabrication.
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Hardy, Dorothy Anne, Zahra Rahemtulla, Achala Satharasinghe, Arash Shahidi, Carlos Oliveira, Ioannis Anastasopoulos, Mohamad Nour Nashed et al. « Wash Testing of Electronic Yarn ». Materials 13, no 5 (9 mars 2020) : 1228. http://dx.doi.org/10.3390/ma13051228.

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Electronically active yarn (E-yarn) pioneered by the Advanced Textiles Research Group of Nottingham Trent University contains a fine conductive copper wire soldered onto a package die, micro-electro-mechanical systems device or flexible circuit. The die or circuit is then held within a protective polymer packaging (micro-pod) and the ensemble is inserted into a textile sheath, forming a flexible yarn with electronic functionality such as sensing or illumination. It is vital to be able to wash E-yarns, so that the textiles into which they are incorporated can be treated as normal consumer products. The wash durability of E-yarns is summarized in this publication. Wash tests followed a modified version of BS EN ISO 6330:2012 procedure 4N. It was observed that E-yarns containing only a fine multi-strand copper wire survived 25 cycles of machine washing and line drying; and between 5 and 15 cycles of machine washing followed by tumble-drying. Four out of five temperature sensing E-yarns (crafted with thermistors) and single pairs of LEDs within E-yarns functioned correctly after 25 cycles of machine washing and line drying. E-yarns that required larger micro-pods (i.e., 4 mm diameter or 9 mm length) were less resilient to washing. Only one out of five acoustic sensing E-yarns (4 mm diameter micro-pod) operated correctly after 20 cycles of washing with either line drying or tumble-drying. Creating an E-yarn with an embedded flexible circuit populated with components also required a relatively large micro-pod (diameter 0.93 mm, length 9.23 mm). Only one embedded circuit functioned after 25 cycles of washing and line drying. The tests showed that E-yarns are suitable for inclusion in textiles that require washing, with some limitations when larger micro-pods were used. Reduction in the circuit’s size and therefore the size of the micro-pod, may increase wash resilience.
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Huang, Fei, Jiyong Hu et Xiong Yan. « Review of Fiber- or Yarn-Based Wearable Resistive Strain Sensors : Structural Design, Fabrication Technologies and Applications ». Textiles 2, no 1 (8 février 2022) : 81–111. http://dx.doi.org/10.3390/textiles2010005.

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Flexible textile strain sensors that can be directly integrated into clothing have attracted much attention due to their great potential in wearable human health monitoring systems and human–computer interactions. Fiber- or yarn-based strain sensors are promising candidate materials for flexible and wearable electronics due to their light weights, good stretchability, high intrinsic and structural flexibility, and flexible integrability. This article investigates representative conductive materials, traditional and novel preparation methods and the structural design of fiber- or yarn-based resistive strain sensors as well as the interconnection and encapsulation of sensing fibers or yarns. In addition, this review summarizes the effects of the conductive materials, preparation strategy and structures on the crucial sensing performance. Discussions will be presented regarding the applications of fiber- or yarn-based resistive strain sensors. Finally, this article summarizes the bottleneck of current fiber- or yarn-based resistive strain sensors in terms of conductive materials, fabrication techniques, integration and performance, as well as scientific understanding, and proposes future research directions.
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Yang, Rui-Hua, Yuan Xue et Wei-Dong Gao. « Structure and performance of color blended rotor spun yarn produced by a novel frame with asynchronous feed rollers ». Textile Research Journal 89, no 3 (17 décembre 2017) : 411–21. http://dx.doi.org/10.1177/0040517517748493.

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This paper introduces a new and flexible spinning method that is modified on a rotor spinning machine. The modification is implemented by a novel mechanical system specially designed to incorporate three separate feed rollers side by side and controlled by servo motors with programmable logic controller (PLC). Using this new method, yarn structure parameters including linear density and blend ratio can be controlled and realized by asynchronous drafted slivers. Sixty-six types of color blended yarns were produced by controlling blending percentages of three basic colored slivers (magenta, yellow, and cyan) by changing the feeding speeds of the slivers respectively with constant yarn linear density and color. Surface morphologies, blending effects, and performances of the yarns were tested and analyzed. In addition, fancy yarns including slub yarn, period melange yarn, gradient melange yarn, and color pointed melange yarn were produced and their longitudinal morphologies were taken. The results demonstrated spinning feasibility and product variety of the three channeled rotor spun process.
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Sun, Xianqiang, Jianxin He, Rong Qiang, Nan Nan, Xiaolu You, Yuman Zhou, Weili Shao, Fan Liu et Rangtong Liu. « Electrospun Conductive Nanofiber Yarn for a Wearable Yarn Supercapacitor with High Volumetric Energy Density ». Materials 12, no 2 (16 janvier 2019) : 273. http://dx.doi.org/10.3390/ma12020273.

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One-dimensional, flexible yarn-shaped supercapacitors for woven cloth have the potential for use in different kinds of wearable devices. Nevertheless, the challenge that supercapacitors face is low energy density. In this paper, we present a low-cost and large-scale manufacturing method to construct a supercapacitor yarn with high power and high energy density. To construct the novel and flexible poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate)–polyacrylonitrile (PDEOT: PSS-PAN)/Ni cotton (PNF/NiC) capacitor yarn, an electrospinning technique was initially used to wrap the polyacrylonitrile (PAN) nanofibers around the core Ni-coated yarn. The PEDOT: PSS–PAN nanofiber composite electrode was created using in situ deposition and H3PO4/PVA was used as a gel electrolyte. This electrode material has a yarn/nanofiber/PEDOT: PSS nanoparticle hierarchical structure, providing a high specific area and enhanced pseudocapacitance. The electrode demonstrated a high volumetric capacitance of 26.88 F·cm−3 (at 0.08 A·cm−3), an energy density of 9.56 mWh·cm−3, and a power density of 830 mW·cm−3. In addition, the PNF/NiC capacitor yarns are lightweight, highly flexible, resistant to bending fatigue, can be connected in series or parallel, and may be suitable for a variety of wearable electronic products.
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Et. al., Yuldashev Alisher Tursunbayevich,. « Investigation of Influence ofa New Twist Intensifier on the Properties of the Twisted Yarn ». Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no 5 (10 avril 2021) : 1943–49. http://dx.doi.org/10.17762/turcomat.v12i5.2275.

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The article is devoted to the study of the properties of the yarn obtained by the methods of ring and rotor spinning, for twisted yarn, produced on a VTS-09 double twist machine made by Volkmann (Germany). Experiments were carried out on two typesof spinning yarns with yarn counts Ne 20/2 and 12/2 in the existing design (control) and the new design, flexible element with equal tension and twist intensifier and compared the effects of the resulting twisted yarn for quality parameters. Mathematical statistical methods (single-factor analysis of variance) were used to assess the quality of twisted yarn. Experiments have shown that the use of a new design nozzle reduces the vibration of the yarn, which leads to a uniform distribution of twists along the length of the twisted yarn, increases its tensile strength and improves the quality of the twisted yarn.
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Simegnaw, Abdella Ahmmed, Benny Malengier, Melkie Getnet Tadesse et Lieva Van Langenhove. « Development of Stainless Steel Yarn with Embedded Surface Mounted Light Emitting Diodes ». Materials 15, no 8 (14 avril 2022) : 2892. http://dx.doi.org/10.3390/ma15082892.

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The integration of electronic components in/onto conductive textile yarns without compromising textile qualities such as flexibility, conformability, heat and moisture transfer, and wash resistance is essential to ensuring acceptance of electronic textiles. One solution is creating flexible and stretchable conductive yarns that contain tiny surface-mounted electronic elements embedded at the fiber level. The purpose of this work was to manufacture and subsequently evaluate the physical features and electromechanical properties of stainless steel yarn with light-emitting surface mounted devices (SMDs) embedded in it. The SMDs were successfully integrated into a conductive stainless steel yarn (SS) by inserting crimp beads and creating a bond through hot air soldering machines, resulting in what we call an E-yarn. The relationship curves between gauge length and electrical resistance, and the relationship curves between conductive yarn elongation and electrical resistance, were explored experimentally. The results of the analysis demonstrated that E-yarn had a lower tensile strength than the original electrically-conductive SS yarn. The effects of the washing cycle on the conductivity of the E-yarn were also investigated and studied. The results showed that E-yarns encapsulated at the solder pad by heat shrink tube still functioned well after ten machine wash cycles, after which they degraded greatly.
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Šahta, Ingrida, Aleksandrs Vališevskis, Ilze Baltiņa et Sniedze Ozola. « Development of Textile Based Sewn Switches for Smart Textile ». Advanced Materials Research 1117 (juillet 2015) : 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1117.235.

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The intelligent systems of smart textile should contain flexible electronics, for example, sewn or stitched textile elements that function as conductive traces, sensor elements, electrodes or switches. The experiments for development of sewn touch and push switches are performed. For this reason silver coated multifilament polyamide and multifilament stainless steel yarns were used and their properties and suitability tested. Tests include the changes of electrical resistance of yarns during tension, measurements of yarn voltage loss at 50 mA current; experiments to assess the yarn suitability for sewing; reliability tests of switches during use.
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Yi, Zhou, Muhammad Ali, Xiaozhou Gong, Hanming Dai et Deng Zhongmin. « An experimental investigation of the yarn pull-out behavior of plain weave with leno and knitted insertions ». Textile Research Journal 89, no 21-22 (mars 2019) : 4717–31. http://dx.doi.org/10.1177/0040517519832845.

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Yarn–yarn sliding force plays a vital role in absorbing impact energy for plain fabrics. This paper reports the methods and results of an investigation on the mechanisms that enable higher yarn pull-out force of woven fabrics with the incorporation of lenos and knits. The experimental results suggested that the insertion of leno lines on plain weave gives an approximately 20% increase in junction rupture force over the original plain construction. With knitted structures inserted, the structure-modified fabrics showed a junction rupture force up to about 15 times higher than simple plain weave. It was even found that the yarns failed rather than pulled out in multiple yarn pull-out tests. This is because knitted structures tend to become self-locked and consequently restrict yarn displacement when subjected to external loading. This investigation reports a method to increase the frictional force between the warp and weft yarns based on textile technologies. It is expected that the results obtained could provide some useful information for the engineering design of flexible ballistic protection systems.
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Thèses sur le sujet "Flexible yarn"

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Wu, Hankai. « Développement de transducteurs piézo-résistifs sur substrat textile pour caractérisation de flux d'air ». Electronic Thesis or Diss., Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2024. http://www.theses.fr/2024IMTA0405.

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L’objectif de ce travail est le développement de solution de détection de perte de charge d’un filtre à air qui doit être intégré à celui-ci pour un fonctionnement dans une centrale de traitement d’air (CTA). En effet, la perte de charge des filtres augmente avec la durée d’utilisation, et cette évolution a un impact non négligeable sur la consommation énergétique des ventilateurs de la CTA. Un système de mesure a été développé à partir de capteurs commerciaux connectés à un microcontrôleur, cependant ce système n’est pas perméable au flux d’air. Une solution de détection textile, basée sur le phénomène de la piézo-résistivité a été donc proposée et développée. Le substrat de base textile qui a été choisi est l’élasthanne pour ses propriétés d’élasticité, et sa capacité à se déformer sous faible contrainte. Ce matériau a été fonctionnalisé par deux techniques avec un polymère π conjugué, le poly(3,4-éthylènedioxythiophène), possédant des propriétés semi-conductrices et apportant une conductivité exploitable à un fil textile unitaire sur des longueurs de l’ordre du mètre. Ces fils textiles fonctionnalisés ont été caractérisés mécaniquement, morphologiquement, électriquement et électro-mécaniquement. Les résultats ont montré une affinité de la couche conductrice sur le substrat textile, et des procédés d’entraînement ont été établis afin d’améliorer les réponses électromécaniques pour une élongation de 5%. Pour finir, des tests préliminaires de détection sur une gaine de ventilation à l’échelle du laboratoire et sur une CTA à l’échelle industrielle ont permis de conclure que ces fils pouvaient discriminer des vitesses d’air allant de 1 à 3 m/s
The aim of this work is to develop a pressure drop detecting system, which is to be integrated onto an air filter in an air handling unit (AHU). Indeed, filter pressure drop increases with the duration of use, and theevolution has a significant impact on the energy consumption of AHU. A measurement system has been developed using commercial sensors connected to a microcontroller. But this system is not permeable to airflow. A textile sensing solution, based on the piezoresistive phenomenon, was therefore proposed and developed. The textile substrate chosen was elastane, because of its elasticity and ability to deform under low stress. This material was functionalized by two techniques with a π conjugated polymer, poly(3,4-ethylenedioxythiophene), possessing semiconducting properties and bringing exploitable conductivity to a unitary textile yarn over lengths of the order of a meter. These functionalized textile yarns were characterized mechanically, morphologically, electrically and electromechanically. The results demonstrated the affinity of the conductive layer to the textile substrate, and training procedures were established to improve electromechanical responses at 5% elongation. Finally, preliminary detection tests on a laboratory-scale ventilation duct and on an industrial-scale AHU concluded that these yarns could discriminate air velocities ranging from 1 to 3 m/s
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Chapitres de livres sur le sujet "Flexible yarn"

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Huang, Yang, et Chunyi Zhi. « Fiber/Yarn-Based Flexible Supercapacitor ». Dans Flexible Energy Conversion and Storage Devices, 37–65. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527342631.ch2.

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Rath, Jan-Erik, Robert Graupner et Thorsten Schüppstuhl. « Die-Less Forming of Fiber-Reinforced Plastic Composites ». Dans Lecture Notes in Mechanical Engineering, 3–14. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18326-3_1.

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AbstractFiber-reinforced plastics (FRP) are increasingly popular in light weight applications such as aircraft manufacturing. However, most production processes of thin-walled FRP parts to date involve the use of expensive forming tools. This especially hinders cost-effective production of small series as well as individual parts and prototypes. In this paper, we develop new possible alternatives of highly automated and die-less production processes based on a short review of current approaches on flexible thin-walled FRP production. All proposed processes involve robot guided standard tools, similar to incremental sheet metal forming, for local forming of the base materials. These include woven glass fiber fabrics which are locally impregnated with thermoset resin and cured using UV-light, woven commingled yarns made out of glass fibers and thermoplastic fibers which are locally heated and pressed, as well as pre-consolidated thermoplastic organo sheets which require selective heating for forming. General applicability of the processes is investigated and validated in practical experiments.
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Răzvan Rădulescu, Ion, Lilioara Surdu, Emilia Visileanu, Bogdana Mitu et Cristian Morari. « Life Cycle Assessment of Flexible Electromagnetic Shields ». Dans Electromagnetic Compatibility [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.99772.

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Nowadays, fiber based flexible electromagnetic shields have widespread applications in ensuring Electromagnetic Compatibility (EMC). Shielding is a solution of EMC, and the main methods to estimate shielding effectiveness are represented by the circuit method and the impedance method. Magnetron sputtering of metallic layers represents a novel technique to impart electric conductive properties to fabrics. Coating of fabrics represents a second main option to manufacture textile shields beside the insertion of conductive yarns in the fabric structure. Life Cycle Assessment (LCA) is often used to assess a comparatively modern with a classical manufacturing process in order to prove its eco-friendly character. This chapter comparatively assesses flexible EM shields manufactured of fabrics with inserted conductive yarns with and without magnetron plasma coating. The copper plasma coating of cotton fabrics with inserted silver yarns increases shielding effectiveness (EMSE) by 8–10 dB. In order to keep for the LCA study the same functional unit of 50 dB at 100 MHz for one sqm of fabric, the fabric structure is modeled with a reduced distance between the inserted conductive yarns. Results of the LCA study show a substantial impact on the environment for the plasma coated fabric upon using a laboratory scale deposition set-up.
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Patel, Priyam Subhash, Rakesh Singh Kunwar et Akash Thakar. « Malware Detection Using Yara Rules in SIEM ». Dans Malware Analysis and Intrusion Detection in Cyber-Physical Systems, 313–30. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-8666-5.ch014.

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In this cyber world, working from the office to the home, security has never been more challenging. To detect attacks on the host computers and prevent further malicious activities, host intrusion detection systems (HIDS) are often used. Use of open-source SEIM tool Wazuh for monitoring and combines with YARA for file analysis. YARA rules are like those of a programming language that operates by specifying variables that indicate patterns identified in malware, depending on the rule. If any or all the conditions are satisfied, it can be used to effectively identify at least a portion of malware that defines variable parameters. YARA rules help SIEM operators analyse the file tag for malware detection before using it to its full potential. In this chapter, we are going to learn and implement malware analysis using Wazuh, and YARA rules before infecting the system fully. A flexible and effective method for detecting malware in system logs, network traffic, and other data sources is produced by combining WAZUH and YARA rules. By utilising the advantages of YARA rules and the sophisticated features of WAZUH, security teams can quickly identify malware attacks and respond to them. This lessens the effect on their business. A modern cybersecurity strategy must contain WAZUH SIEM and YARA rules. With YARA rules, security teams may spot malware attacks in WAZUH and take appropriate action to maintain the security and integrity of their organization's data and systems.
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Negru, Daniela, Liliana Buhu et Ionuţ Dulgheriu. « Developement of Conductive Flexibile Fabrics Using Conductive Yarns and Polypyrrole Coating ». Dans International Symposium "Technical Textiles - Present and Future", 6–10. Sciendo, 2022. http://dx.doi.org/10.2478/9788366675735-002.

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Actes de conférences sur le sujet "Flexible yarn"

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Khandelwal, Gaurav, Abhishek Singh Dahiya et Ravinder Dahiya. « Yarn based UV photodetectors for E-textiles ». Dans 2022 IEEE International Flexible Electronics Technology Conference (IFETC). IEEE, 2022. http://dx.doi.org/10.1109/ifetc53656.2022.9948435.

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Uddin, Mohammed Jasim, Tarik J. Dickens, Jin Yan, David O. Olawale, Okenwa I. Okoli et Federico Cesano. « Solid-State Dye Sensitized Optoelectronic Carbon Nanotube-Wires : An Energy Harvesting Damage Sensor With Nanotechnology Approach ». Dans ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8200.

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A novel preparation method of solid state photovoltaic carbon nanotubes (CNT) yarns has been successfully developed by depositing and grafting TiO2 thin films on CNT yarn substrates using a simple sol–gel method and designed for use in structural health monitoring (SHM) applications. The interaligned, ultrastrong and flexible CNYs display excellent electrical conductivity, mechanical integrity and their catalytic properties have been successfully used as working and counter electrodes. The TiO2 nanoparticles have been found to form a homogeneous thin film on the yarn surface, which shows efficient photovoltaic properties with remarkable stability when exposed to simulated solar light (AM 1.5). The yarns’ structure is not altered upon sol-gel treatment and light exposure. The TiO2 film is firmly anchored and the photovoltaic performance is retained even after multiple irradiation cycles. This preparation technique can also be applied to CNT yarn reinforced composite for an innovative in-situ and real-time self damage-sensing properties with infused triboluminescent (TL) materials.
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Gao, Yang, Lin Liu, Jonghyun Cho et Seokheun Choi. « Flexible and Scalable Biochemical Energy Harvesting : A Yarn-Based Biobattery ». Dans 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2019. http://dx.doi.org/10.1109/memsys.2019.8870873.

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Takeuchi, Hidetoshi, Tsuyoshi Inoue et Kentaro Takagi. « Numerical Simulation of Yarn’s Snarl Motion Considering Self-Contact and its Experimental Verification ». Dans ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85721.

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A yarn has a flexible structure whose axial length is very long compared its diameter. When loose yarn twists at its end, the yarn intertwines with itself as shown in Fig. 1 to produce a shape called a snarl shape with motion referred to as snarl motion. The snarl shape sometimes cuts the yarn or reduces the yarn quality, and may reduce the productivity of textile machinery. As a preliminary step of handling snarl motion in the processes of textile machinery, this paper extends functions of a yarn model proposed in our previous study by appending a contact force and implementing a multithread computing method for fast simulation. The paper validates the yarn model by comparing the results of numerical simulation and experiment. Six-threads computing can make calculation at 5 times the rate possible with single-thread computing.
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Nowak, Nicholas, Muhammad Ali Bablu et James Manimala. « Investigation of Yarn Pullout As a Mechanism of Ballistic Performance Enhancement in Silica Nanoparticle-Impregnated Kevlar Fabric ». Dans ASME 2023 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/smasis2023-111430.

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Abstract Impregnating Kevlar fabric with silica nanoparticles is known to augment its mechanical properties, especially under shear deformation. Silica nanoparticle-impregnated Kevlar (SNK) fabric could therefore display improved ballistic performance. In this study, firstly, the ballistic performance of SNK with various percentages by weight of nanoparticle addition and number of layers is investigated utilizing compressed air gun experiments. A colloid-based process is used to impregnate spherical silica nanoparticles having 80–100 nm diameter into Kevlar 29-based K745 style plain woven fabric in a dry state. It was found that the addition of nanoparticles provided about 17.3 % mass advantage (owing to three fewer layers) for the 40 wt.% SNK over neat Kevlar for the non-penetrative case. The area of the damaged zone also showed a strong positive correlation with the kinetic energy absorbed at higher treatment levels. Further, SEM imaging revealed that at higher treatment levels the nanoparticles tend to agglomerate in the interstitial spaces of yarn crossover points. This indicated that the nanoparticles restrict yarn mobility and could improve inter-yarn friction, contributing to the engagement of secondary yarns away from the primary impact zone in the impact mitigation mechanism. In order to understand this mechanism better, yarn pullout tests are conducted on neat and treated fabrics under various conditions. Quasistatic and dynamic loading for in-plane and out-of-plane yarn pullout configurations are examined using customized experimental rigs. Factors such as yarn direction, lateral tension, pullout rate, nanoparticle size, shape, material and treatment level are being considered. For each case, the pullout force versus displacement history is recorded and critical features are extracted. In addition, digital footage is used to analyze pullout kinematics. It is noted that the peak pullout force increases with nanoparticle addition until a threshold treatment level is reached. For a given fabric style and weave, an optimal nanoparticle type and treatment level helps maximize peak pullout force and inter-yarn friction. Coefficients for linear, quadratic, and exponentially decaying sinusoidal fitting functions for various pull-out regimes are calibrated to model yarn pull-out behavior vis-à-vis the treatment parameters. Further analysis of the yarn pullout mechanisms is underway to better understand the ballistic performance enhancement displayed by SNK. It is anticipated that nanoparticle treated flexible armors would not only enhance ballistic protection, but also be amenable to integration with multifunctional capabilities such as wearable electronics, wound coagulation, or smart camouflage.
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Hernandez, Corey D., Mei Zhang, Shaoli Fang, Ray H. Baughman, Thomas S. Gates et Seun K. Kahng. « Multifunctional Characteristics of Carbon Nanotube (CNT) Yarn Composites ». Dans ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17028.

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By forming composite structures with Carbon Nanotube (CNT) yarns we achieve materials capable of measuring strain and composite structures with increased mechanical strength. The CNT yarns used are of the 2-ply and 4-ply variety with the yarns having diameters of about 15–30 μm. The strain sensing characteristics of the yarns are investigated on test beams with the yarns arranged in a bridge configuration. Additionally, the strain sensing properties are also investigated on yarns embedded on the surface of a flexible membrane. Initial mechanical strength tests also show an increase in the modulus of elasticity of the composite materials while incurring a weight penalty of less than one-percent. Also presented are initial temperature characterizations of the yarns.
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Degroote, Joris, Lucas Delcour, Laurent De Moerloose, Henri Dolfen et Jan Vierendeels. « Fluid-Structure Interaction Simulations of Flexible Cylinders in Confined Axial Flow ». Dans ASME 2018 5th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fedsm2018-83193.

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Flexible cylinders surrounded by a fluid flow that is dominantly aligned with the axis of the cylinders can be found in several applications. Examples with a flow confined to a narrow region around the cylinder(s) can be found in tube bundles of heat exchangers and reactor cores and also in air-jet weaving machines. This research analyses the flow-induced vibration of these two different cases with flexible cylinders in confined axial flow using numerical fluid-structure interaction (FSI) simulations. The FSI simulations of both cases use a partitioned framework, meaning that a computational fluid dynamics (CFD) solver is coupled with a finite element analysis (FEA) structural solver. The dynamic and kinematic equilibrium conditions at the contact surface between the fluid and the structure are satisfied by performing coupling iterations between both solvers in each time step. Convergence of these iterations is accelerated using quasi-Newton coupling techniques. For the case of the tube bundle, the modal characteristics have been identified for a tube bundle when they are submerged in an axial fluid flow. Furthermore, different types of flow-induced vibration have been studied. The flow speed has been increased in an FSI simulation of a single cylinder surrounded by an annular fluid domain, resulting first in static buckling and then in flutter at higher flow speeds. For the case of the air-jet weaving machines, the cylinder represents a smooth yarn which is accelerated by an air jet in the main nozzle of the machine, consisting of a long tube with small diameter. FSI simulations of a yarn clamped at the upstream end have been performed using the arbitrary Lagrangian-Eulerian formulation with deforming grids in the fluid domain. This work demonstrates the feasibility of analyzing and predicting flow-induced vibration of cylinders in confined axial flow by performing FSI simulations. The results of simulations are compared with those of experiments for tubes in axial flow and for a yarn in a nozzle of an air-jet weaving machine.
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Li, Xiaoting, et King Wai Chiu Lai. « Highly Flexible and Stretchable Structure Based on Au/Graphene Film and Polyurethane Yarn ». Dans 2019 IEEE 19th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2019. http://dx.doi.org/10.1109/nano46743.2019.8993926.

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Kandasamy, Senthil Kumar, Chandrasekaran Arumugam, Logupriya Vadivel, Saravanakumar Kandasamy et Deepa Karuppaiah. « Fabrication of ZnO – Carbonized cotton yarn derived hierarchical porous active carbon flexible electrodes ». Dans PROCEEDINGS OF THE 4TH NATIONAL CONFERENCE ON CURRENT AND EMERGING PROCESS TECHNOLOGIES E-CONCEPT-2021. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0068853.

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Grosu, Marian Catalin, Raluca Maria Aileni et Teodor Sarbu. « ELECTRICAL RESISTIVITY DISTRIBUTION ANALYSIS FOR TEXTILE STRUCTURES BASED ON COPPER YARNS ». Dans 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023/4.1/s17.07.

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The paper presents a new approach to the design and development of textile woven structures with copper yarn content intended for heating systems. Copper is known for its high electrical conductivity, meaning it can easily transfer electrical energy through its surface. This makes copper yarns ideal for heating applications, as they can quickly and efficiently transfer heat to the surrounding environment. In addition to their electrical properties, copper yarns also have good thermal conductivity, which means that they can transfer heat from one surface to another without losing much energy. Copper yarns are also highly durable and flexible, assuring comfort to wear, non-toxic, reliable, and safe which makes them ideal for use in a range of textile performance applications, including clothing and non-clothing systems, with reduced risk of fire or electrical hazards. The analysis of the surface electrical resistivity as a function of the structural parameters of the woven textile structures, namely the distribution and the thickness of the copper yarns in the fabric's weft will highlight the variations between the conductive fabrics developed.
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