Artykuły w czasopismach na temat „Flexible yarn”
Kliknij ten link, aby zobaczyć inne rodzaje publikacji na ten temat: Flexible yarn.
Utwórz poprawne odniesienie w stylach APA, MLA, Chicago, Harvard i wielu innych
Sprawdź 50 najlepszych artykułów w czasopismach naukowych na temat „Flexible yarn”.
Przycisk „Dodaj do bibliografii” jest dostępny obok każdej pracy w bibliografii. Użyj go – a my automatycznie utworzymy odniesienie bibliograficzne do wybranej pracy w stylu cytowania, którego potrzebujesz: APA, MLA, Harvard, Chicago, Vancouver itp.
Możesz również pobrać pełny tekst publikacji naukowej w formacie „.pdf” i przeczytać adnotację do pracy online, jeśli odpowiednie parametry są dostępne w metadanych.
Przeglądaj artykuły w czasopismach z różnych dziedzin i twórz odpowiednie bibliografie.
1
Dai, Zhang, Fangfang Yan, Mei Qin i Xu Yan. "Fabrication of flexible SiO2 nanofibrous yarn via a conjugate electrospinning process". e-Polymers 20, nr 1 (27.10.2020): 600–605. http://dx.doi.org/10.1515/epoly-2020-0063.
Pełny tekst źródłaStreszczenie:
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.
2
Lugoda, Pasindu, Julio C. Costa, Carlos Oliveira, Leonardo A. Garcia-Garcia, Sanjula D. Wickramasinghe, Arash Pouryazdan, Daniel Roggen, Tilak Dias i Niko Münzenrieder. "Flexible Temperature Sensor Integration into E-Textiles Using Different Industrial Yarn Fabrication Processes". Sensors 20, nr 1 (21.12.2019): 73. http://dx.doi.org/10.3390/s20010073.
Pełny tekst źródłaStreszczenie:
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.
3
Hardy, Dorothy Anne, Zahra Rahemtulla, Achala Satharasinghe, Arash Shahidi, Carlos Oliveira, Ioannis Anastasopoulos, Mohamad Nour Nashed i in. "Wash Testing of Electronic Yarn". Materials 13, nr 5 (9.03.2020): 1228. http://dx.doi.org/10.3390/ma13051228.
Pełny tekst źródłaStreszczenie:
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.
4
Huang, Fei, Jiyong Hu i Xiong Yan. "Review of Fiber- or Yarn-Based Wearable Resistive Strain Sensors: Structural Design, Fabrication Technologies and Applications". Textiles 2, nr 1 (8.02.2022): 81–111. http://dx.doi.org/10.3390/textiles2010005.
Pełny tekst źródłaStreszczenie:
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.
5
Yang, Rui-Hua, Yuan Xue i 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, nr 3 (17.12.2017): 411–21. http://dx.doi.org/10.1177/0040517517748493.
Pełny tekst źródłaStreszczenie:
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.
6
Sun, Xianqiang, Jianxin He, Rong Qiang, Nan Nan, Xiaolu You, Yuman Zhou, Weili Shao, Fan Liu i Rangtong Liu. "Electrospun Conductive Nanofiber Yarn for a Wearable Yarn Supercapacitor with High Volumetric Energy Density". Materials 12, nr 2 (16.01.2019): 273. http://dx.doi.org/10.3390/ma12020273.
Pełny tekst źródłaStreszczenie:
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.
7
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, nr 5 (10.04.2021): 1943–49. http://dx.doi.org/10.17762/turcomat.v12i5.2275.
Pełny tekst źródłaStreszczenie:
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.
8
Simegnaw, Abdella Ahmmed, Benny Malengier, Melkie Getnet Tadesse i Lieva Van Langenhove. "Development of Stainless Steel Yarn with Embedded Surface Mounted Light Emitting Diodes". Materials 15, nr 8 (14.04.2022): 2892. http://dx.doi.org/10.3390/ma15082892.
Pełny tekst źródłaStreszczenie:
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.
9
Šahta, Ingrida, Aleksandrs Vališevskis, Ilze Baltiņa i Sniedze Ozola. "Development of Textile Based Sewn Switches for Smart Textile". Advanced Materials Research 1117 (lipiec 2015): 235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1117.235.
Pełny tekst źródłaStreszczenie:
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.
10
Yi, Zhou, Muhammad Ali, Xiaozhou Gong, Hanming Dai i Deng Zhongmin. "An experimental investigation of the yarn pull-out behavior of plain weave with leno and knitted insertions". Textile Research Journal 89, nr 21-22 (marzec 2019): 4717–31. http://dx.doi.org/10.1177/0040517519832845.
Pełny tekst źródłaStreszczenie:
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.
11
Zhao, Hongmei, Zhang Dai, Tian He, Shufang Zhu, Xu Yan i Jianjun Yang. "Fabrication of PANI-modified PVDF nanofibrous yarn for pH sensor". e-Polymers 22, nr 1 (23.12.2021): 69–74. http://dx.doi.org/10.1515/epoly-2022-0013.
Pełny tekst źródłaStreszczenie:
Abstract In recent years, with the rise of an intelligent concept, oral and maxillofacial surgery smart dressing had also attracted the interest of researchers, especially for the pH sensor with flexible medium. In this study, polyvinylidene fluoride (PVDF) nanofibrous yarn was fabricated by a conjugate electrospinning process and modified with in situ polymerization of polyaniline (PANI) forming a PANI/PVDF yarn. By a weaving process, these yarns could be weaved into a fabric. It was found that both the PANI/PVDF yarn and the fabric showed a sensitivity to pH, about −48.53 mV per pH for yarn and −38.4 mVper pH for fabric, respectively, in the pH range of 4.0–8.0. These results indicated that the prepared PANI-modified PVDF yarn and fabric might have a potential application in intelligent oral and maxillofacial surgery dressings for monitoring wound healing.
12
Su, Chuanli, Fangbing Lin, Jinhua Jiang, Huiqi Shao i Nanliang Chen. "Mechanical and electrical properties of graphene-coated polyimide yarns improved by nitrogen plasma pre-treatment". Textile Research Journal 91, nr 13-14 (5.01.2021): 1627–40. http://dx.doi.org/10.1177/0040517520984102.
Pełny tekst źródłaStreszczenie:
One-dimensional high-performance yarns with excellent conductivity and flexibility are of considerable interest in the energy and aerospace industries. However, how to achieve highly conductivity, excellent flexibility, extreme condition durability and high mechanical performance in one fiber material is still a great challenge using economically viable materials and synthesis technologies. Herein, we report electrically conductive yarns (modified polyimide (M-PI)/reduced graphene oxide (RGO) yarns) consisting of RGO coated on the surface of nitrogen plasma M-PI yarns, which are fabricated by combining the N2 plasma pre-treatment and repeated dip-coating and reducing technique. N2 plasma treatment is used to roughen the surface of the PI yarn and introduce functional groups, contributing to improve wettability, which can provide a stronger adhesion of the graphene coating. The dip-coating and reducing process was repeated 10 times to enhance the loading mass of RGO on the PI yarns, then M-PI/RGO yarns with better conductivity property can be obtained. The effects of N2 plasma treatment power and time on the M-PI yarns and M-PI/RGO yarns are investigated and discussed. The results demonstrate that the graphene layer is uniformly and densely coated on the PI yarn when being treated at 200 W for 8 min, and the conductivity of the M-PI/RGO yarn reaches 1.51 × 102 S/m. The M-PI/RGO yarn combine the advantages of RGO and PI yarns, retaining the mechanical properties and thermal stability of PI yarn while exploiting the conductive property of RGO. In addition, the enhanced adhesion between the PI yarn and graphene coating endows the composite yarns with excellent fastness and superior flexibility. This work describes an environmentally friendly, controllable and facile method to develop flexible and conductive functional graphene-coated PI yarns with high-performance properties.
13
Yavas, Arzu, Ozan Avinc i Görkem Gedik. "Ultrasound and Microwave Aided Natural Dyeing of Nettle Biofibre (Urtica dioica L.) with Madder (Rubia tinctorum L.)". Fibres and Textiles in Eastern Europe 25 (31.08.2017): 111–20. http://dx.doi.org/10.5604/01.3001.0010.2855.
Pełny tekst źródłaStreszczenie:
The success of suture yarn depends upon its tensile and bending properties. As sutures pass through the tissue, it should possess enough strength to hold the tissue together and should be flexible so as to be knotted. The aim of the present work was to improve the strength of silk suture without affecting its bending properties. Silk sutures were fabricated using a circular braiding machine. Structural variations were made by varying the diameter and by producing core sheath suture yarn. The resulting suture yarn is coated with chitosan – a biopolymer. The mechanical performances of suture materials coated with and without chitosan were studied and compared with commercial suture. It was observed that the suture with a core-sheath structure performed well during tensile and knot testing. The coarser yarns exhibited higher bending rigidity and lower knot strength than the finer suture yarns.
14
Sadegh, Ali M., i Paul V. Cavallaro. "Mechanics of Energy Absorbability in Plain-Woven Fabrics: An Analytical Approach". Journal of Engineered Fibers and Fabrics 7, nr 1 (marzec 2012): 155892501200700. http://dx.doi.org/10.1177/155892501200700102.
Pełny tekst źródłaStreszczenie:
Experimental studies have shown that flexible woven fabrics can absorb significant kinetic energy from both projectile and fragment impacts through a combination of design factors which include yarn materials, weaving architectures, yarn density ratios, as well as the projectile mass, shape and velocity.1–3 This paper investigates the relationships between various plain-woven fabric architectures, crimp imbalance and energy absorption capacities when rigid projectile strike these fabrics through a series of analytical solutions. This was accomplished through formulations of the yarn pullout and yarn migration forces. Special attention is given to the friction forces generated between yarn families at the yarn crossover regions. It was assumed that the yarns do not fail while the projectile penetrates through the fabric. Finally, the relationships between the residual velocities of the projectile and the contact angles α, (that is, the angle of circumferential contact between crossing yarns which is related to the crimp content) were determined. The results indicated that for ballistic impacts, highly crimp-imbalanced woven fabrics perform in a manner far superior to that of equally-crimped woven fabrics. These analytical solutions resulted in the ability to parametrically study the effects of crimp contents and, in particular, crimp imbalance on the effectiveness of plain-woven fabric armors.
15
Grujicic, M., G. Arakere, T. He, M. Gogulapati i B. A. Cheeseman. "A numerical investigation of the influence of yarn-level finite-element model on energy absorption by a flexible-fabric armour during ballistic impact". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 222, nr 4 (1.10.2008): 259–76. http://dx.doi.org/10.1243/14644207jmda209.
Pełny tekst źródłaStreszczenie:
A series of transient non-linear dynamic finite-element method (FEM) analyses pertaining to the interaction of a single-ply plain-woven balanced square textile-fabric armour with a spherical steel projectile is carried out in order to compare the corresponding results obtained for two different yarn models: (a) a solid FEM model in which the warp and weft yarns are represented using first-order three-dimensional solid elements and (b) a membrane model in which the same yarns are represented using second-order membrane elements. The analyses are carried out under different yarn—yarn and projectile—fabric frictional conditions and under different far-field boundary conditions applied to the edges of the fabric. The results obtained showed that the two sets of analyses yield comparable predictions regarding the temporal evolution and the spatial distribution of the deformation and damage fields within the fabric, regarding the ability of the fabric to absorb the projectile's kinetic energy and regarding the relative contributions of the main energy absorbing mechanisms. The work also confirmed the roles yarn—yarn and projectile—fabric friction play in the impact process as well as the effect of the far-field boundary conditions applied to the edges of the fabric.
16
Meng, Fenye, Shaoqing Dai, Yong Zhang i Jiyong Hu. "The Interconnecting Process and Sensing Performance of Stretchable Hybrid Electronic Yarn for Body Temperature Monitoring". Polymers 16, nr 2 (15.01.2024): 243. http://dx.doi.org/10.3390/polym16020243.
Pełny tekst źródłaStreszczenie:
Flexible and stretchable electronic yarn containing electronic components (i.e., hybrid electronic yarn) are essential for manufacturing smart textile garments or fabrics. Due to their low stretchability and easy interconnection fracture, previously reported hybrid electronic sensing yarns have poor mechanical durability and washability. In order to address this issue, a stretchable hybrid electronic yarn for body temperature monitoring was designed and prepared using a spandex filament as the core yarn and a thin enameled copper wire connected with a thermal resistor as the wrapping fiber. The temperature sensing performance of different hybrid electronic yarn samples was evaluated using the following three types of interconnection methods: conductive adhesive bonding, melt soldering, and hot pressure bonding. The optimal interconnection method with good sensing performance was determined. Furthermore, in order to improve the mechanical durability of the hybrid electronic yarn made using the optimal interconnection method, the interconnection area was encapsulated with polymers, and the effect of polymer materials and structures on the temperature-sensing properties was evaluated. The results show that traditional wrapping combined with hot pressing interconnection followed by tube encapsulating technology is beneficial for achieving high stretchability and good temperature-sensing performance of hybrid electronic yarn.
17
Guo, Hui Fen, Ngan Yi Kitty Lam, Chenxiao Yang i Li Li. "Simulating three-dimensional dynamics of flexible fibers in a ring spinning triangle: chitosan and cotton fibers". Textile Research Journal 87, nr 11 (4.08.2016): 1403–10. http://dx.doi.org/10.1177/0040517516654106.
Pełny tekst źródłaStreszczenie:
A three-dimensional particle-level simulation method is developed to simulate fiber dynamics in the ring spinning triangle. The fiber is modeled as a chain of beads connected through massless rods, and its flexibility is defined by the stretching, bending and twisting displacements. As the application of the proposed approach, the effects of the chitosan (CS)/cotton (CT) fiber initial position and length on fiber motion and yarn properties are discussed. The deflections of CS fibers along the roller axis are larger compared with those of CT fibers, which will lead to CS migrating outwards in CS/CT blended yarn. The short CS fibers (22 mm) will move toward the top roller surface and shift quickly out of the roller nip, and thus yarn strength is lower. The tailing end of the longest CS fiber (46 mm) will drift off the roller nip, which makes little or no contribution to the yarn strength. For 38 mm length CS fiber, it moves toward the bottom roller surface and is bound into the roller nip, and thus can produce the highest tenacity CS/CT blended yarns. The simulation results agree with the spinning experimental data reported by other researchers.
18
Choi, Jin Hyeong, Juwan Kim, Jun Ho Noh, Gyuyoung Lee, Chaewon Yoon, Ui Chan Kim, In Hyeok Jang, Hae Yong Kim i Changsoon Choi. "High–Performance Biscrolled Ni–Fe Yarn Battery with Outer Buffer Layer". International Journal of Molecular Sciences 24, nr 2 (5.01.2023): 1067. http://dx.doi.org/10.3390/ijms24021067.
Pełny tekst źródłaStreszczenie:
The increasing demand for portable and wearable electronics has promoted the development of safe and flexible yarn–based batteries with outstanding electrochemical properties. However, achieving superior energy storage performance with a high active material (AM) load and long cycle life with this device format remains a challenge. In this study, a stable and rechargeable high–performance aqueous Ni–Fe yarn battery was constructed via biscrolling to embed AMs within helical carbon nanotube (CNT) yarn corridors. Owing to the high load of charge storage nanoparticles (NPs; above 97 wt%) and the outer neat CNT layer, the buffered biscrolled Ni–Fe yarn battery demonstrates excellent linear capacity (0.053 mAh/cm) and cycling stability (60.1% retention after 300 charge/discharge cycles) in an aqueous electrolyte. Moreover, our flexible yarn battery exhibits maximum energy/power densities of 422 mWh/cm3 and 7535 mW/cm3 based on the total volume of the cathode and anode, respectively, which exceed those reported for many flexible Ni–Fe batteries. Thus, biscrolled Ni–Fe yarn batteries are promising candidates for next–generation conformal energy solutions.
19
Zhang, Junze, Jing Liu, Zeyu Zhao, Di Huang, Chao Chen, Zhaozhu Zheng, Chenxi Fu i in. "A facile scalable conductive graphene-coated Calotropis gigantea yarn". Cellulose 29, nr 6 (1.03.2022): 3545–56. http://dx.doi.org/10.1007/s10570-022-04475-z.
Pełny tekst źródłaStreszczenie:
AbstractGraphene-functionalized fibers have attracted substantial attention due to their potential applications in flexible wearable electronics. However, these conventional conductive materials face difficulties in mass production, which limits their large-scale fabrication. In this paper, we report a graphene-coated Calotropis gigantea yarn by pad dyeing with graphene oxide and a reduction process, which endows it with high conductivity, outstanding conducting stability, and scale production capacity. By optimizing the dyeing parameters, the modified yarns display a high electrical conductivity of 6.9 S/m. Range analysis results indicate that the electrical conductivity of the graphene-coated yarns exhibits a strong dependence on the concentration of graphene oxide and pad dyeing cycles. The hydrogen bonding between the fiber and graphene during the dyeing process renders the functionalized yarns stable conductivity to washing and bending. Based on the simple fabrication process and fascinating performance, the graphene-coated yarn show great potential in facile scale production of conductive yarns.
20
Bompadre, Francesca, i Jacopo Donnini. "Fabric-Reinforced Cementitious Matrix (FRCM) Carbon Yarns with Different Surface Treatments Embedded in a Cementitious Mortar: Mechanical and Durability Studies". Materials 15, nr 11 (31.05.2022): 3927. http://dx.doi.org/10.3390/ma15113927.
Pełny tekst źródłaStreszczenie:
Nowadays, FRCM systems are increasingly used for the strengthening and retrofitting of existing masonry and reinforced concrete structures. Their effectiveness strongly depends on the bond that develops at the interface between multifilament yarns, which constitute the reinforcing fabric, and the inorganic matrix. It is well known that fabric yarns, especially when constituted by dry carbon fibers, have poor chemical-physical compatibility with inorganic matrices. For this reason, many efforts are being concentrated on trying to improve the interface compatibility by using different surface treatments on multifilament yarns. In this paper, three different surface treatments have been considered. The first two involve yarn pre-impregnation with flexible epoxy resin or nano-silica coating, while the third one involves a fiber oxidation process. Uniaxial tensile tests were carried out on single carbon yarns to evaluate tensile strength, elastic modulus and ultimate strain before and after surface treatments, and also after yarn exposure to accelerated artificial aging conditions (1000 h in saline or alkaline solutions at 40 °C), to evaluate their long-term behavior in aggressive environments. Pull-out tests on single carbon yarns embedded in a cementitious mortar were also carried out, under normal environmental conditions and after artificial exposure. Epoxy proved to be the most effective treatment, by increasing the yarn tensile strength of 34% and the pull-out load of 138%, followed by nano-silica (+9%; +40%). All surface treatments were shown to remain effective even after artificial environmental exposures, with a maximum reduction of yarn tensile strength of about 13%.
21
Delcour, Lucas, Jozef Peeters i Joris Degroote. "Three-dimensional fluid-structure interaction simulations of a yarn subjected to the main nozzle flow of an air-jet weaving loom using a Chimera technique". Textile Research Journal 90, nr 2 (17.07.2019): 194–212. http://dx.doi.org/10.1177/0040517519862884.
Pełny tekst źródłaStreszczenie:
In air-jet weaving looms, the main nozzle pulls the yarn from the prewinder by means of a high velocity air flow. The flexible yarn is excited by the flow and exhibits high amplitude oscillations. The motion of the yarn is important for the reliability and the attainable speed of the insertion. Fluid-structure interaction simulations calculate the interaction between the air flow and the yarn motion and could provide additional insight into yarn behavior. However, the use of an arbitrary Lagrangian–Eulerian approach for the deforming fluid domain around a flexible yarn typically results in severe mesh degradation, vastly reducing the accuracy of the calculations or limiting the physical time that can be simulated. In this research, the feasibility of using a Chimera technique to simulate the motion of a yarn interacting with the air flow from a main nozzle was investigated. This methodology combines a fixed background grid with a moving component grid deforming along with the yarn. The component grid is, however, not constrained by the boundaries of the flow domain allowing for large deformations with limited mesh degradation. Two separate cases were investigated. In the first case, the yarn was considered to be clamped at the main nozzle inlet. For the second case, the yarn was allowed to move axially as the main nozzle pulled it from a drum storage system.
22
Alshukur, Malek, i George Stylios. "Engineering the geometry of novel yarns for flexible, hybrid composites Part I: Multiple breaks". Journal of Composite Materials 56, nr 10 (20.03.2022): 1577–89. http://dx.doi.org/10.1177/00219983221080502.
Pełny tekst źródłaStreszczenie:
This study reports on the development of a novel form of yarn reinforcement for making super tough, flexible composites. The concept is based on the rupturing of components of the composite yarn many times before totally breaking. The composite yarn structure has a configuration of three main components − helical, straight and sinusoidal. The components are not restricted by the type of raw material, and any type of fibre or blend can be used. Experimentally, the hollow-spindle spinning system was used to make nine variants of this composite yarn. These variants were tested for their tensile behaviour at an extension rate of 250 mm/min. It was found that the core component of two of the nine variants had eight breakages, while the core component of the remaining variants had four to five breakages before the final break of the core component. The main mechanism that allows the core component yarn to break so many times is a locking applied to it by the wrapping yarn during stretching. The gain in strength for these variants was 21–81% in comparison with a typical twistless composite yarn. Flexible composites made of such yarn configurations can find numerous uses in construction, geotextiles, ballistic protective garments, aerospace, automotive and shipping industries.
23
Chen, Si, i Hai Ru Long. "The Effect of Spacer Yarn Arrangement on Compression Behaviors of Novel Flexible Foam-Core Sandwich Composites". Advanced Materials Research 821-822 (wrzesień 2013): 1152–58. http://dx.doi.org/10.4028/www.scientific.net/amr.821-822.1152.
Pełny tekst źródłaStreszczenie:
In this study, a kind of novel flexible foam-core sandwich composite was involved. The flexible foam-core sandwich composites were fabricated based on 3D warp-knitted spacer fabrics. The foam-core was filled in the spacer fabric by using a kind of modified hydrophilic polyurethane foam. In order to investigate the effect of spacer yarn inclination angle on the compression behaviors. A compression test was carried out. The compression stress-strain curve was used to analyze the effect of 3D warp-knitted spacer fabric spacer yarn arrangement. According to the experiment results, it indicates that the spacer yarn arrangement could influence the anti-compression capacity of the sandwich composites obviously. Therefore, the spacer yarn arrangement of 3D warp-knitted spacer fabrics can be changed to meet specific end-use requirement for foam-core sandwich composites.
24
Barthod-Malat, Benjamin, Cédric Cochrane i François Boussu. "Development of Piezoresistive Sensor Yarn to Monitor Local Fabric Elongation". Textiles 1, nr 2 (2.07.2021): 170–84. http://dx.doi.org/10.3390/textiles1020008.
Pełny tekst źródłaStreszczenie:
The performance of bulletproof vests is mainly based on the energy absorption capacity of the flexible fibrous reinforcements. To understand the in situ behaviour of these textile structures during a ballistic impact, we find the use of sensor yarns integrated into these fibrous reinforcements to be a non-invasive and reliable solution. Measurements of the dynamic deformation of the sensor yarns will provide a new and useful source of information. The design and manufacturing stages of a sensor yarn, made with the same structural yarns of the fabric, are detailed successively. Then, different batches of sensor yarns were designed, and electromechanical tensile tests were performed in quasi-static mode. These experiments provide encouraging results for the measurement of the deformation of a textile structure subject to a dynamic impact.
25
Jun Sim, Hyeon, Changsoon Choi, Chang Jun Lee, Youn Tae Kim i Seon Jeong Kim. "Flexible Two-ply Piezoelectric Yarn Energy Harvester". Current Nanoscience 11, nr 4 (5.06.2015): 539–44. http://dx.doi.org/10.2174/1573413711666150225231434.
Pełny tekst źródła
26
Hwang, Sung-Ho, Young Kwang Kim, Soon Moon Jeong, Changsoon Choi, Ka Young Son, Soo-Keun Lee i Sang Kyoo Lim. "Wearable colorimetric sensing fiber based on polyacrylonitrile with PdO@ZnO hybrids for the application of detecting H2 leakage". Textile Research Journal 90, nr 19-20 (25.03.2020): 2198–211. http://dx.doi.org/10.1177/0040517520912729.
Pełny tekst źródłaStreszczenie:
A colorimetric hydrogen sensor has great potential for accurately detecting and monitoring the leakage of hydrogen gas on account of its fast color change in contact with hydrogen gas. However, for the practical application of the sensor, such as in gas detection systems in clothing, the flexibility and stability of the sensor need to be improved. Here, we present a novel method to fabricate a flexible colorimetric hydrogen sensor with the stable embedment of sensing material. To improve the flexibility and stability of the sensor, polyacrylonitrile nanofiber containing palladium oxide and zinc oxide hybrid nanoparticles was prepared by electrospinning. The flexible colorimetric hydrogen sensor can detect 1000 ppm hydrogen gas with excellent selectivity within 2 min. We also suggest film and yarn-type flexible colorimetric hydrogen sensors for industrial and wearable applications. A laminating process was used to prepare the film. In contrast, twisting and polydimethylsiloxane coating were used to prepare the yarn-type flexible colorimetric hydrogen sensor. Compared with a flexible colorimetric hydrogen-sensing nanofiber, the film and yarn show identical sensitivity for detecting a hydrogen leakage. These applications of hydrogen sensors could be a new insight into the design of a flexible sensor for detecting hydrogen leakage with the naked eye.
27
Yang, Shi-Yi, Yi-Fan Wang, Yuan Yue i Shao-Wei Bian. "Flexible polyester yarn/Au/conductive metal-organic framework composites for yarn-shaped supercapacitors". Journal of Electroanalytical Chemistry 847 (sierpień 2019): 113218. http://dx.doi.org/10.1016/j.jelechem.2019.113218.
Pełny tekst źródła
28
Junge, Theresa, Rike Brendgen, Carsten Grassmann, Thomas Weide i Anne Schwarz-Pfeiffer. "Development and Characterization of Hybrid, Temperature Sensing and Heating Yarns with Color Change". Sensors 23, nr 16 (10.08.2023): 7076. http://dx.doi.org/10.3390/s23167076.
Pełny tekst źródłaStreszczenie:
A person’s body temperature is an important indicator of their health status. A deviation of that temperature by just 2 °C already has or can lead to serious consequences, such as fever or hypothermia. Hence, the development of a temperature-sensing and heatable yarn is an important step toward enabling and improving the monitoring and regulation of a person’s body temperature. This technology offers benefits to several industries, such as health care and sports. This paper focuses on the characterization and development of a hybrid yarn, which can measure and visualize temperature changes through a thermoresistive and thermochromic effect. Moreover, the yarn is able to serve as a flexible heating element by connecting to a power source. The structure of the yarn is designed in three layers. Each layer and component ensures the functionality and flexibility of the yarn and additional compatibility with further processing steps. A flexible stainless steel core was used as the heat-sensitive and heat-conducting material. The layer of polyester wrapped around the stainless steel yarn improves the wearing comfort and serves as substrate material for the thermochromic coating. The resulting hybrid yarn has a reproducible sensory function and changes its resistance by 0.15 Ω between 20 and 60 °C for a length of 30 cm. In addition, the yarn has a uniform and reproducible heating power, so that temperature steps can be achieved at a defined length by selecting certain voltages. The thermochromic color change is clearly visible between 28 and 29 °C. Due to its textile structure, the hybrid sensory and actuating yarn can easily be incorporated into a woven fabric or into a textile by means of joining technology sewing.
29
Huang, Yuxiang, i Jonathan Y. Chen. "All-carbon cord-yarn supercapacitor". Journal of Industrial Textiles 48, nr 5 (16.03.2017): 875–83. http://dx.doi.org/10.1177/1528083717699370.
Pełny tekst źródłaStreszczenie:
Flexible solid-state yarn supercapacitors were fabricated using commercial carbon fiber and activated carbon fiber. Two methods of yarn construction were studied. One was twisting carbon fiber and activated carbon fiber together (plied yarn), and the other was wrapping activated carbon fiber on carbon fiber (wrapped yarn). Electrochemical measurements in terms of cyclic voltammetry (CV), galvanostatic charge/discharge (GC) and electrical impedance spectroscopy (EIS) were conducted. The result revealed that the cord-yarn structure performed better than the core-spun yarn structure, by showing a specific length capacitance of 82 mF cm−1 at 2 mVs−1. It also exhibited a high specific length energy density of 20.4 μW h cm−1 at a power density of 60 μW cm−1. There was little capacitance reduction when the cord-yarn supercapacitor was bent or crumpled, showing an excellent mechanical flexibility.
30
Ahmad, Tauheed, Hafsa Jamshaid, Rajesh Kumar Mishra, Vijay Chandan, Shabnam Nazari, Tatiana Alexiou Ivanova, Naseer Ahamad, Sharjeel Ahmed, Michal Petru i Lubos Kučera. "Development of Lightweight Cricket Pads Using Knitted Flexible Thermoplastic Composites with Improved Impact Protection". Materials 15, nr 23 (5.12.2022): 8661. http://dx.doi.org/10.3390/ma15238661.
Pełny tekst źródłaStreszczenie:
Cricket is one of the most popular global sports, and cricket pads are important personal protective gear used for shock absorption and peak deceleration of the impact forces of the cricket ball for both batsmen and wicket keepers. The materials selection of the padding should be considered according to requirements. In the present study, flexible composites were manufactured using knitted unidirectional thermoplastic composite prepregs. Prepregs were fabricated using thermoplastic yarns, e.g., High Density Polyethylene (HDPE), Polypropylene (PP), and Low Melting Polyester (LMPE). Para-aramid (Kevlar) and Flax yarns were used as inlay. The structures were stacked in three and five layers, and hot compression was used to convert thermoplastic yarn into matrix. A total of twelve samples were prepared, and their mechanical properties were evaluated. Tensile and flexural properties, short beam strength, and impact properties were optimized using the multi-criteria decision-making (MCDM) technique for order performance by similarity to ideal solution (TOPSIS). This approach was used to select the best material for use in cricket pads. The candidate samples were ranked using statistical techniques. The optimum sample was found to be FP5, i.e., Flax with polypropylene using five layers, which exhibited the maximum impact strength. The results showed that the mechanical properties were improved in general by increasing the number of layers. The significance and percentage contribution of each factor was obtained by ANOVA (α = 0.10) and pie chart, which showed Factors A and C (inlay yarn and number of layers) to be the main contributors. The optimal samples showed superior impact-related performance compared to a market sample cricket pad.
31
Chen, Guang Feng, Qing Qing Huang, Lin Lin Zhai i Qing Qing Li. "Elastic Rod Based Carpet Loop Pile Trajectory Simulation". Advanced Materials Research 680 (kwiecień 2013): 392–97. http://dx.doi.org/10.4028/www.scientific.net/amr.680.392.
Pełny tekst źródłaStreszczenie:
The 3D simulation of tufted carpet pile loops need to calculate the direction loop pile. By simplifying the tufted carpet yarn into elongated elastic rod, without considering the extrusion between loops piles, applying pressure at both ends of loop pile. By analyzing the elastic rod stress deformation and using Matlab simulate to determine the yarn centerline direction with the flexible line. The simulation results show that the obtained yarn centerline path is consistent with the trend of actual loop pile.
32
Gao, Huipu, Pham Thien Minh, Hong Wang, Sergiy Minko, Jason Locklin, Tho Nguyen i Suraj Sharma. "High-performance flexible yarn for wearable piezoelectric nanogenerators". Smart Materials and Structures 27, nr 9 (10.08.2018): 095018. http://dx.doi.org/10.1088/1361-665x/aad718.
Pełny tekst źródła
33
Sramala, Peeraya. "A Study of Knitted Fabric from Thai Silk Waste Yarn". International Journal of Creative and Arts Studies 4, nr 1 (1.06.2017): 1. http://dx.doi.org/10.24821/ijcas.v4i1.1950.
Pełny tekst źródłaStreszczenie:
Thai silk is a part of Thailand regional cultural heritage. The unique characteristics are gummy, sticky substance and shining. Thai silk Industry share a common problem to other industries, the process produces a lot of waste. A solid waste from Thai silk can be classified into three types: Incomplete cocoons broken silk yarn; and silk fabric waste. Generally, these waste use for reuse in the business roles such as fashion accessories and decorative produc t. In order to adding value to Thai Silk waste can be done by knitted fabric properties: more flexible and able to produce in flat, seamless, and three dimension. The recycle concept led to following studies: 1) To do an experiment of yarn spinning from Thai silk waste fibre; 2) To experiment a knitted fabric from a yarn of Thai silk waste and; 3) To experiment yarn dyed and knitted fabric piece dyed by natural dyeing colour. A method of study consist of fibre preparing and spinning by hand, the equipment to develop knitted fabric are hand knitting and knitting machine, the natural dyeing colour come from coffee grounds, Turmeric, Red cabbage, and Mulberry. The result of study are: 1) Fibre and spinning experiment shown a yarn is uneven; yarn from broken silk yarn, silk fabric waste, and incomplete cocoon fibre are sticky and softly touch respectively; 2) Knitted fabric experiment showed that the production by hand knitting are soft and flexible than a knitting machine. While knitting machine fabric is smooth surface than hand knitting fabric and; 3) Natural colour dyeing experiment showed that the colour absorption of yarn dyed is better than piece dyed. In conclusion, a result of the study can be used as a guideline idea to create new knitted fabric made from Thai silk waste to present the aesthetic values through textures, colours, structure and pattern.
34
Wang, Jinfeng, Saeid Soltanian, Peyman Servati, Frank Ko i Ming Weng. "A knitted wearable flexible sensor for monitoring breathing condition". Journal of Engineered Fibers and Fabrics 15 (styczeń 2020): 155892502093035. http://dx.doi.org/10.1177/1558925020930354.
Pełny tekst źródłaStreszczenie:
This article presents the development of a knitted flexible sensor, which is embedded into a seamless garment, for monitoring health condition. The sensor is designed as an elastic weft-knitted plain structure, where the conductive silver-plating filament yarn is used for breathing signal collection and the spandex core-spun yarn is used to ensure good attachment of the garment to human body. The breathing amplitude and breathing frequency are obtained from the variations in sensor resistance. The sensor can measure various kinds of breathing conditions, such as normal breathing, slow breathing, fast breathing, and shallow breathing. The results are in reasonable agreement with the actual condition. Such kind of flexible sensors have the advantages of wearable and comfort.
35
LILIANA, BUHU, NEGRU DANIELA, LOGHIN EMIL CONSTANTIN i BUHU ADRIAN. "Analysis of tensile properties for conductive textile yarn". Industria Textila 70, nr 02 (2019): 116–19. http://dx.doi.org/10.35530/it.070.02.1517.
Pełny tekst źródłaStreszczenie:
In this paper conductive yarns were made by coating the yarns with a solution having carbon black nanoparticles (CB) with an average diameter of 18 nm, polyvinyl alcohol (PVA) and water. For a continuous coating deposition it is necessary to obtain a solution of a certain consistency; for this reason, carbon black nanoparticles are mixed with the ingredients so that the resulting film deposited as a thin layer on the yarn to be conductive, and at the same time flexible. The carbon black nanoparticles tend to form aggregates; this is why the solution should be stirred continuously. The yarns used as support are different from the nature, fineness and structure point of view. Several variants of yarns were chosen in order to decide which ones are appropriate for obtaining conductive yarns that keep their specific initial properties. The variants of conductive yarns obtained were tested in terms of physical and mechanical properties (tensile strength, elongation), and from the viewpoint of electrical properties, electrical resistivity was measured. After coating the conductive layer, yarns shows greater rigidity, but can be used to obtain textile materials such as woven fabrics. After performing the measurements, it can be concluded that the yarns coated with a conductive solution based on CB shows electrical conductivity and can be used for obtaining conductive textile fabrics.
36
Saleemi, Sidra, Mohamed Amine Aouraghe, Xiaoxiao Wei, Wei Liu, Li Liu, M. Irfan Siyal, Jihyun Bae i Fujun Xu. "Bio-Inspired Hierarchical Carbon Nanotube Yarn with Ester Bond Cross-Linkages towards High Conductivity for Multifunctional Applications". Nanomaterials 12, nr 2 (10.01.2022): 208. http://dx.doi.org/10.3390/nano12020208.
Pełny tekst źródłaStreszczenie:
The cross-linked hierarchical structure in biological systems provides insight into the development of innovative material structures. Specifically, the sarcoplasmic reticulum muscle is able to transmit electrical impulses in skeletal muscle due to its cross-linked hierarchical tubular cell structure. Inspired by the cross-linked tubular cell structure, we designed and built chemical cross-links between the carbon nanotubes within the carbon nanotube yarn (CNT yarn) structure by an esterification reaction. Consequently, compared with the pristine CNT yarn, its electrical conductivity dramatically enhanced 348%, from 557 S/cm to 1950 S/cm. Furthermore, when applied with three voltages, the electro-thermal temperature of esterified CNT yarn reached 261 °C, much higher than that of pristine CNT yarn (175 °C). In addition, the esterified CNT yarn exhibits a linear and stable piezo-resistive response, with a 158% enhanced gauge factor (the ratio of electrical resistance changing to strain change ~1.9). The superconductivity, flexibility, and stable sensitivity of the esterified flexible CNT yarn demonstrate its great potential in the applications of intelligent devices, smart clothing, or other advanced composites.
37
Adusei, Paa Kwasi, Kevin Johnson, Sathya N. Kanakaraj, Guangqi Zhang, Yanbo Fang, Yu-Yun Hsieh, Mahnoosh Khosravifar, Seyram Gbordzoe, Matthew Nichols i Vesselin Shanov. "Asymmetric Fiber Supercapacitors Based on a FeC2O4/FeOOH-CNT Hybrid Material". C 7, nr 3 (14.08.2021): 62. http://dx.doi.org/10.3390/c7030062.
Pełny tekst źródłaStreszczenie:
The development of new flexible and lightweight electronics has increased the demand for compatible energy storage devices to power them. Carbon nanotube (CNT) fibers have long been known for their ability to be assembled into yarns, offering their integration into electronic devices. They are hindered, however, by their low intrinsic energy storage properties. Herein, we report a novel composite yarn, synthesized through solvothermal processes, that attained energy densities in the range between 0.17 µWh/cm2 and 3.06 µWh/cm2, and power densities between 0.26 mW/cm2 and 0.97 mW/cm2, when assembled in a supercapacitor with a PVDF-EMIMBF4 electrolyte. The created unique composition of iron oxalate + iron hydroxide + CNT as an anode worked well in synergy with the much-studied PANI + CNT cathode, resulting in a highly stable yarn energy storage device that maintained 96.76% of its energy density after 4000 cycles. This device showed no observable change in performance under stress/bend tests which makes it a viable candidate for powering wearable electronics.
38
Grujicic, Mica, Jennifer Snipes i S. Ramaswami. "Single-yarn pull-out test in neat, solvent-treated and shear-thickening fluid-impregnated Kevlar® KM2 fabric". International Journal of Structural Integrity 8, nr 2 (10.04.2017): 154–78. http://dx.doi.org/10.1108/ijsi-03-2016-0009.
Pełny tekst źródłaStreszczenie:
Purpose In order to help explain experimental findings related to the stabbing- and ballistic-penetration resistance of flexible body-armor, single-yarn pull-out tests, involving specially prepared fabric-type test coupons, are often carried out. The purpose of this paper is to develop a finite-element-based computational framework for the simulation of the single-yarn pull-out test, and applied to the case of Kevlar® KM2 fabric. Design/methodology/approach Three conditions of the fabric are considered: neat, i.e, as-woven; polyethylene glycol (PEG)-infiltrated; and shear-thickening fluid (STF)-infiltrated. Due to differences in the three conditions of the fabric, the computational framework had to utilize three different finite-element formulations: standard Lagrangian formulation for the neat fabric; combined Eulerian-Lagrangian formulation for the PEG-infiltrated fabric (an Eulerian subdomain had to be used to treat the PEG solvent/dispersant); and combined continuum Lagrangian/discrete-particle formulation for the STF-infiltrated fabric (to account for the interactions of the particles suspended in PEG, which give rise to the STF character of the suspension, with the yarns, the particles had to be treated explicitly). Findings The results obtained for the single-yarn pull-out virtual tests are compared with the authors’ experimental counterparts, and a reasonably good agreement is obtained, for all three conditions of the fabric. Originality/value To the authors’ knowledge, the present work represents the first attempt to simulate single-yarn pull-out tests of Kevlar® KM2 fabric.
39
SAJJADIEH, SABA, FATEME SAFARI, BAHARE GHALEBI i MOHSEN SHANBEH. "EFFECT OF TENSILE FATIGUE CYCLIC LOADING ONPERFORMANCE OF TEXTILE-BASED STRAIN SENSORS". Fibres and Textiles 30, nr 1 (2023): 5–10. http://dx.doi.org/10.15240/tul/008/2023-1-001.
Pełny tekst źródłaStreszczenie:
Textile-based strain sensors are a potential platform used in wearable devices for sensing and. 8 sensors containing monitoring the human body. These sensors not only have all the conventional sensors benefits but also, they are low-cost, flexible, light-weight, and easily adopted with three-dimensional shape of the body. Moreover, recent research has shown they are the best candidates for monitoring human’s body motion. In this study, the effect of tensile fatigue cyclic loads on performance and sensitivity of textilebased strain sensors was investigated polyester/stainless steel staple fiber blend yarn as a conductive part with different structures were produced. The sensors varied in weft and warp density, percentage of stainless steel in conductive yarn, the number of conductive yarns, and weave pattern. The sensors were subjected to 500 cyclic loads operations and their tensile properties and sensitivity were investigated and compared before and after applying tensile fatigue cyclic loads. The results showed the textile-based strain sensors containing less percentage of stainless-steel fiber, lower number of conductive yarns, twill weave pattern and lower density in warp and weft direction have shown better performance after tensile fatigue cyclic loads.
40
SONGYIFAN, SONGYIFAN, HEXINHAI HEXINHAI, LIANG ju NHAO, ZHANGZHIYI ZHANGZHIYI i ZHANGLIANG ZHANGLIANG. "Design of a new braiding device with 3D integral active yarn carrie". Industria Textila 71, nr 06 (10.12.2020): 557–61. http://dx.doi.org/10.35530/it.071.06.1706.
Pełny tekst źródłaStreszczenie:
The braided motion of a Cartesian braiding machine is realized by pushing the yarn carriers against each other, whichresults in the low braiding efficiency, single product and poor expansion at present. A new braiding device three-dimen -sional (3D) integral active yarn carrier is designed. Firstly, the Integral braiding technology and traditional braidingequipment are analysed. Then an automated guided vehicle (AGV) based active carrier and its braided chassis aredesigned. A new steering device and power supply system are developed. The braiding process is wirelessly controlled.Finally, it is concluded that the flexible braiding of prefabricated parts of various complex shapes can be realized by theintegrated braiding technology of the active yarn carrier through the analysis of the structure and working mode of theactive yarn carrier.
41
SONGYIFAN, SONGYIFAN, HEXINHAI HEXINHAI, LIANG ju NHAO, ZHANGZHIYI ZHANGZHIYI i ZHANGLIANG ZHANGLIANG. "Design of a new braiding device with 3D integral active yarn carrie". Industria Textila 71, nr 06 (10.12.2020): 557–61. http://dx.doi.org/10.35530/t.071.06.1706.
Pełny tekst źródłaStreszczenie:
The braided motion of a Cartesian braiding machine is realized by pushing the yarn carriers against each other, whichresults in the low braiding efficiency, single product and poor expansion at present. A new braiding device three-dimen -sional (3D) integral active yarn carrier is designed. Firstly, the Integral braiding technology and traditional braidingequipment are analysed. Then an automated guided vehicle (AGV) based active carrier and its braided chassis aredesigned. A new steering device and power supply system are developed. The braiding process is wirelessly controlled.Finally, it is concluded that the flexible braiding of prefabricated parts of various complex shapes can be realized by theintegrated braiding technology of the active yarn carrier through the analysis of the structure and working mode of theactive yarn carrier.
42
Bekisli, Burak, Johann Pancrace i Herman F. Nied. "Mechanical Behavior of Highly-Flexible Elastomeric Composites with Knitted-Fabric Reinforcement". Key Engineering Materials 504-506 (luty 2012): 1123–28. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1123.
Pełny tekst źródłaStreszczenie:
This paper examines critical issues associated with the fabrication and forming of highly-flexible polymeric composites, reinforced with knitted-fabric structures. Knitted-fabric reinforcements have not generally been preferred over more traditional woven reinforcements in high-performance composites, mainly because of their lower stiffness/strength performance when embedded in a rigid, thermosetting matrix material. However, with their unique formability, knitted fabrics promise great potential in applications where large deformation of the structure is desirable; such as energy/impact absorption and forming applications. One very attractive feature of knitted composite materials, is the large displacements that the underlying knitted fabric can potentially undergo before exhibiting a significant increase in stiffness. The unusual extensional behavior of knit fabric is attributed to the fact that the fibers are more-or-less free to slide over each other before the yarns become highly oriented, eventually “locking” in a packed formation. When the loops become highly elongated, the knit fabric achieves its maximum resistance to in-plane deformation, and exhibits a stiffness closely related to the elastic stiffness of the straightened fiber/yarn bundles. The unique formability of knitted fabrics is mainly due to this yarn movement. The highly “stretchable” behavior of knitted textile reinforcement materials can be used to great advantage in thermoforming composite structures. In order to fully utilize the exceptional stretch properties of the knitted-fabric, the matrix material should be able to deform at least as much as the fabric, and the knitted yarn movements need to be restricted by the matrix as little as possible. In this study, a multi-level finite element procedure was developed to analyze and control the deformation characteristics of plain weft knit reinforced composites. A database of mechanical properties for various knit geometries was obtained. Using these results, it is shown that carefully “tailored” knit fabric reinforcement can be used to improve mechanical performance and facilitate polymer forming processes, such as thermoforming. In this study, elastomeric materials such as polyurea and thermoplastic elastomer (TPE) were used to fabricate composites with knitted-fabric. Two different types of arrangements were experimentally studied: knitted fabric embedded in the elastomer and a sandwich of knitted fabric between elastomeric skins. It is shown that by fully utilizing the high stretchability of the knitted fabric reinforcements, attractive material properties can be obtained especially for energy/impact absorption and forming applications. The improvement of thermoforming process stability with the use of carefully tailored knitted fabric reinforcements is also presented.
43
Donnini, Jacopo, Giovanni Lancioni, Tiziano Bellezze i Valeria Corinaldesi. "Bond Behavior of FRCM Carbon Yarns Embedded in a Cementitious Matrix: Experimental and Numerical Results". Key Engineering Materials 747 (lipiec 2017): 305–12. http://dx.doi.org/10.4028/www.scientific.net/kem.747.305.
Pełny tekst źródłaStreszczenie:
The use of inorganic cement based composite systems, known as Fiber Reinforced Cementitious Matrix (FRCM), is a very promising technique for retrofitting and strengthening the existing masonry or concrete structures. The effectiveness of FRCM systems is strongly related to the interface bond between inorganic matrix and fabric reinforcement, and, since the major weakness is often located on this interface, the study of stress-transfer mechanisms between fibers and matrix becomes of fundamental importance.FRCM are usually reinforced with uni-directional or bi-directional fabrics consisting of multifilament yarns made of carbon, glass, basalt or PBO fibers, disposed along two orthogonal directions. The difficulty of the mortar to penetrate within the filaments that constitute the fabric yarns and the consequent non-homogeneous stress distribution through the yarn cross section makes difficult to access the characterization of the composite material. The use of polymer coatings on the fibers surface showed to enhance the bond strength of the interface between fibers and mortar and, as a consequence, to improve the mechanical performance of the composite. The coating does not allow the mortar to penetrate within the filaments while is able to improve the bond between the two materials and to increase the shear stress transfer capacity at the interface.An experimental session of several pull out tests on carbon yarns embedded in a cementitious matrix was carried out. Different embedded lengths have been analyzed, equal to 20, 30 and 50 mm. The carbon yarns object of this study were pre-impregnated with a flexible epoxy resin enhanced with a thin layer of quartz sand applied on the surface.A variational model was proposed to evaluate the pull-out behaviour and failure mechanisms of the system and to compare numerical results to the experimental outcomes. Evolution of fracture in the yarn-matrix system is determined by solving an incremental energy minimization problem, acting on an energy functional which account for brittle failure of matrix and yarn, and for debonding at the yarn-matrix interface. The model was able to accurately describe the three phases of the pull-out mechanism, depending on the embedded length.
44
Osman, Akil, Benny Malengier, Simon De Meulemeester, Jozef Peeters, Jan Vierendeels i Joris Degroote. "Simulation of air flow–yarn interaction inside the main nozzle of an air jet loom". Textile Research Journal 88, nr 10 (8.03.2017): 1173–83. http://dx.doi.org/10.1177/0040517517697646.
Pełny tekst źródłaStreszczenie:
The main nozzle of an air jet loom plays an essential role in the weft insertion process. This role involves sucking the weft yarn from the prewinder and launching it into the reed. Simulating the dynamic behavior of the weft yarn inside the main nozzle involves fluid–structure interaction (FSI). In this work, one-way and two-way FSI simulations of air flow–yarn interaction inside a main nozzle have been performed. A three-dimensional model of the flexible weft yarn, consisting of a chain of line segments, and a two-dimensional axisymmetric model of the supersonic flow have been developed and coupled to perform these simulations. The results of the simulations are compared quantitatively and qualitatively with experimental results. Good agreement has been found between the results of the two-way FSI simulations and the experiment. The coupled fluid and structure models provide an effective numerical tool to optimize the geometry of the main nozzle based on the calculated motion and speed of the weft yarn.
45
Farboodmanesh, S., J. Chen, J. Mead i K. White. "Effect of Construction on Mechanical Behavior of Fabric Reinforced Rubber". Rubber Chemistry and Technology 79, nr 2 (1.05.2006): 199–216. http://dx.doi.org/10.5254/1.3547933.
Pełny tekst źródłaStreszczenie:
Abstract Fabrics coated with rubber have wide applications in fields such as medical substrates, protective clothing, and flexible membranes for civil structures, airbags, geotextiles and industrial fabrics. As the market for coated fabrics expands to applications with more complex geometries and loading conditions, a competitive edge can be gained by optimizing the selection of fabric substrate and coating materials. This work includes a detailed experimental study of the effect of various parameters such as weave pattern, yarn size, and coating thickness on rubber coated fabric mechanical response. Nine types of woven PET fabrics were fabricated, consisting of the same warp yarn size and count, but different fill yarns (220, 500, and 1000 denier) and weave patterns (plain weave, 4-harness satin weave, and 8-harness satin weave). The fabrics were coated with neoprene latex using a dip-coating process. The coating penetration was much greater for the two-ply warp yarns than the fill yarns. Both coated and uncoated fabrics were tested. Shear tests and microscopy were used to understand the interaction between the fabric structure and the rubber coating. Results suggest that the shear behavior of the rubber-coated fabric is dominated by the rubber at low shear angles and by the fabric at higher shear angles. These results improve our ability to predict and prevent undesirable behaviors such as wrinkling, distortion and tear.
46
Osman, Akil, Lucas Delcour, Ine Hertens, Jan Vierendeels i Joris Degroote. "Toward three-dimensional modeling of the interaction between the air flow and a clamped–free yarn inside the main nozzle of an air jet loom". Textile Research Journal 89, nr 6 (14.02.2018): 914–25. http://dx.doi.org/10.1177/0040517518758006.
Pełny tekst źródłaStreszczenie:
In air jet looms, the weft yarn is transported from the prewinder to the reed by means of an air flow. In this work, the motion of a yarn inside a main nozzle during the first stage of an insertion process is modeled and analyzed. In this stage, the weft yarn is clamped at one side and free at the other side. Therefore, the deformation waves of a clamped–free yarn are modeled. A three-dimensional, two-way, fluid–structure interaction simulation has been performed in which the yarn is represented as a flexible cylinder and the arbitrary Lagrangian–Eulerian technique is employed. The results of the simulation have been compared quantitatively and qualitatively with experiments. It was, however, not possible to match the initial position and stress state of the yarn in the simulations to that in the experiments. This causes large differences between the simulated and measured yarn positions and wave characteristics, especially at the beginning. The agreement between experimental and simulated wave characteristics notably improves as time progresses, but substantial differences remain. Analyzing the overall motion of the yarn inside the main nozzle shows that the mixing region, where the shocks are located, can be considered as an excitation point. In this point, the aerodynamic normal forces are high if the yarn is not located on the axis of the main nozzle. All deformation waves start from the mixing region and propagate along the yarn.
47
Liu, Jie, Ningyuan Nie, Hua Wang, Zhe Chen, Zhenyuan Ji, Xinfeng Duan i Yan Huang. "A zinc ion yarn battery with high capacity and fire retardancy based on a SiO2 nanoparticle doped ionogel electrolyte". Soft Matter 16, nr 32 (2020): 7432–37. http://dx.doi.org/10.1039/d0sm00996b.
Pełny tekst źródła
48
Messiry, Magdi El, i Abir Mohamed. "New Flex Fatigue Tester for Fiber Reinforced Polymer Composite". Key Engineering Materials 803 (maj 2019): 71–75. http://dx.doi.org/10.4028/www.scientific.net/kem.803.71.
Pełny tekst źródłaStreszczenie:
Textile materials are widely used in the industrial textiles. The yarn and fabric fatigue are not easily prearranged hence, in most cases the apparatuses used for applying cyclic loading under flex fatigue conditions will affect only one section of the yarn and fabric and the results will depend on the level of heterogeneity of the tested material. The common methods of flex fatigue testing are to pull the tested specimen, hold under tension, backward and forward over a fixed roller or grip one end of the specimen while its free end is bent so, the specimen element is alternated between straight and bent form. The new suggested principle is the fixation of the yarns or fabrics in the internal part of rubber tire wheel and pressing it by the pressure of internal rubber tube with the external wheel under predetermined load to give the required bending deformation on the specimen. The theoretical calculation of the design indicates that the testing specimen is subjected to pure bending. In this work, a setup was built up and several types of the technical yarns, fabrics, as well as flexible composites, were tested.it was proves the degradations of the material under the flex fatigue. .
49
Lou, Ching-Wen, Ting-Ting Li, Po-Wen Hwang, An-Pang Chen i Jia Horng Lin. "Preparation Technique and EMI Shielding Evaluation of Flexible Conductive Composite Fabrics Made by Single and Double Wrapped Yarns". Journal of Engineered Fibers and Fabrics 12, nr 4 (grudzień 2017): 155892501701200. http://dx.doi.org/10.1177/155892501701200410.
Pełny tekst źródłaStreszczenie:
Electronics products and communication equipment release electromagnetic (EM) waves in service. EM waves affect biological health and precision instrument accuracy. This study purposes to fabricate flexible conductive composite fabric which is made of complex yarn using metal (stainless steel, copper) fibers and PET filaments. Complex yarn is formed by a rotor twisting machine, at varying values of wrapped number (6.5-16 turns/cm) and lamination number (single-layer, double-layer). Results show that when the complex yarn was wrapped 16 turns/cm, volume resistivity reached 2.9 Ohm-cm and conductivity reaches 0.408 S/cm. Four layers of conductive composite plied with 0°/90°/ 0°/ 90° resulted in the optimum electromagnetic shielding effectiveness, up to 47.7 dB.
50
Su, Fenghua, i Menghe Miao. "Flexible, high performance Two-Ply Yarn Supercapacitors based on irradiated Carbon Nanotube Yarn and PEDOT/PSS". Electrochimica Acta 127 (maj 2014): 433–38. http://dx.doi.org/10.1016/j.electacta.2014.02.064.
Pełny tekst źródła