Academic literature on the topic 'Size-effect, yarn strength, yarn testing'
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Journal articles on the topic "Size-effect, yarn strength, yarn testing"
1
Ma, Qin, and Xue Feng Liu. "Comparative Research of the Sizing Performance of the Compact Spun-Yarn and Ring Spun-Yarn." Advanced Materials Research 535-537 (June 2012): 1425–28. http://dx.doi.org/10.4028/www.scientific.net/amr.535-537.1425.
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The characteristics of the compact spun yarn were introduced, and the problems in the sizing process of compact spun yarns were analyzed. Because of the high size loading of the compact spun yarn, a large number of yarns break and the chubbiness of the fabric were affected. Aiming at the problems above, through sizing experiment and testing of the performance of the yarns, the differences between the compact spun yarn and the conventional ring spun yarn were analyzed. Comparing with the conventional ring spun yarn, the size loading rate of the compact spun yarn was reduced about 1 to 3.5 percentage points under the same equipment conditions and sizing techniques. To obtain the same strength and hairiness sticking effect, the size loading of the compact spun yarn can be 5 to 6 percentage points lower than that of the conventional ring spun yarn. Sizing materials can be saved, and the cost of the sizing process could reduced by 50%.
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Memarian, Farnaz, Mohammad Amani Tehran, and Masoud Latifi. "Characterization of photocatalytic composite nanofiber yarns with respect to their tensile properties." Journal of Industrial Textiles 47, no. 5 (November 25, 2016): 921–37. http://dx.doi.org/10.1177/1528083716679156.
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In this paper, nylon 66/TiO2 composite nanofiber yarn has been developed using electrospinning method. The effect of the TiO2 nanoparticle content on the physical and tensile properties of the resulted composite nanofiber yarns has been extensively investigated using SEM, EDX, FTIR and mechanical testing machine. The probability density function is computed to model the diameter distribution of nanofibers constituent of the composite yarn for different percentages of TiO2. The addition of TiO2 nanoparticles into the electrospun composite nanofiber yarn decreases its tensile strength. The influence of thickness (diameter) and twist of the yarn on its tensile strength has been considered and the optimum conditions with improved tensile strength have been presented. Photoactivity of the composite yarns is tested against Rhodamine B (RhB). Results show that nanocomposite yarns are effective to be used as an economically and environmentally friendly photocatalyst in water remediation processes. They are not dispersed in the solution and can be removed easily without additional and costly steps of filtration or centrifuge.
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Yang, Zhong Cheng, and Lan Ping Shen. "Effect of Blended Ratio on Strength and Elongation Properties of Outlast /Viscose Blended Yarn." Advanced Materials Research 332-334 (September 2011): 407–11. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.407.
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In order to study the effect of different blended ratios on strength and elongation properties of Outlast/viscose blended yarn, ten kinds of blended yarns had been designed and spun. The blended ratios were Outlast/viscose 0/100, 15/85, 25/75, 30/70, 35/65, 40/60, 45/55, 50/50, 60/40, 100/0. By testing the strength and elongation properties of the blended yarn, the effect of blended ratio on blended yarn’s breaking tenacity and elongation rate was analysed. The results showed that, with the increase of blended ratio, the breaking tenacity and breaking elongation rate of the blended yarn both presented a downward trend. But when Outlast/viscose blended ratio was 35:65, breaking elongation rate had a maximum value. When blended ratio was 45:55, breaking tenacity had a maximum value, which should be used in practice.
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Ou, Yunfu, Deju Zhu, Mengying Huang, and Hang Li. "The effects of gage length and strain rate on tensile behavior of Kevlar® 29 single filament and yarn." Journal of Composite Materials 51, no. 1 (July 28, 2016): 109–23. http://dx.doi.org/10.1177/0021998316639121.
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The mechanical properties of Kevlar® 29 single filaments and yarns with different gage lengths were investigated by utilizing an MTI miniature tester and an MTS load frame. Single yarns of 25 mm were also tested over four different strain rates using a drop-weight impact system. The experimental results showed that the mechanical properties of Kevlar® 29 are sensitive to gage length, structural size scale, and strain rate. The tensile strength decreased with increasing gage length and the structural scale from fiber to yarn, and increased with increasing strain rate. Weibull analysis was conducted to quantify the degree of variability in tensile strength. The obtained Weibull parameters were then used in an analytical model to simulate the stress–strain response of single yarn. Finally, Weibull parameters of single filaments with other gage lengths and strain rates were also obtained by fitting the stress–strain curves of single yarns with corresponding testing conditions.
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Broughton, Roy M., Yehia El Mogahzy, and D. M. Hall. "Mechanism of Yarn Failure." Textile Research Journal 62, no. 3 (March 1992): 131–34. http://dx.doi.org/10.1177/004051759206200302.
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The importance of interfiber friction in determining yarn strength has been acknowledged by several authors. Studies of the effect of friction on yarn strength were often based on determining the influence of twist level, a structural factor, to change the level of friction. To our knowledge, no study is available in which varying fiber frictional characteristics are introduced into a constant yarn structure ( i.e., the same twist, fiber type, fiber length, etc.). This effect has been accomplished through a surface treatment that changes the level of interfiber friction, and subsequent yarn testing provides useful and interesting information about how fiber interaction contributes to yarn strength. The results presented here show that interfiber friction can (under certain circumstances) be the dominant factor in determining the tensile properties of a ring spun staple yarn. Friction and yarn strength results show that moderate changes in the interfiber friction can produce large changes in yarn strength. We suggest that interfiber friction should receive more attention as a determinant of yarn properties, particularly strength.
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Herath, Chathura Nalendra, Bok Choon Kang, Jong Kwang Park, Yong Hwang Roh, and Beong Bok Hwang. "Breaking Elongation Properties of Hybrid Yarns by Commingling Process." Materials Science Forum 532-533 (December 2006): 337–40. http://dx.doi.org/10.4028/www.scientific.net/msf.532-533.337.
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This paper is concerned the breaking elongation properties of Carbon/Aramid-, Carbon/Glass- and Aramid/Glass- matrix hybridized commingling yarns. The hybrid yarns produced by commingling process were investigated in terms of breaking elongation property. In experiments, carbon (CF), aramid (AF), and glass (GF) filament yarns were combined. In this study, selected matrix materials include Polyether-ether-Keeton (PEEK), and polyester (PES), or polypropylene (PP). The volume content of filament in hybrid yarn cross section was maintained at 50% for both reinforced and matrix, ant hybrid yarns count at 600 tex, respectively. The reinforcement to matrix filament combination was selected as 1:1 proportion. The effect of different air pressures and material combinations was investigated in terms of breaking elongation. In experiments, each type of hybrid yarn sample has been tested 20 times at the testing speed of 10mm/min. under 3 bar of yarn clamping pressure. Since breaking elongation is one of most important properties in textile fiber, it was examined closely with reference to the first breaking point of commingling-hybrid yarns. It was concluded from experiments that hybrid yarns with higher breaking elongation and higher tensile strength tend to show better force-elongation relationship. It was also known from experiments that the combination of two reinforcement filament yarns gives always much better results than a single reinforcement filament yarns in terms of elongation property. GF/AF/matrix is shown very much better elongation properties. PP and PES gives higher elongation than PEEK as a matrix material.
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Mishra, Swapna. "Effect of Construction on Strain distribution in Woven Fabrics under Uniaxial Tensile Deformation." Journal of Engineered Fibers and Fabrics 8, no. 4 (December 2013): 155892501300800. http://dx.doi.org/10.1177/155892501300800410.
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Woven fabrics form an integral part of technical textiles where strength is of prime importance. Amongst various factors found to affect the tensile properties of woven fabrics, change in weave and numbers of yarns is expected to alter initial crimps, ease of crimp interchange and fabric assistance in both the principle directions of testing. Accordingly, a strain analysis of plain and satinette woven fabric samples in raveled strip testing mode were undertaken in this work. The samples were generated under similar weaving conditions while varying only the pick density systematically. An analysis of the strain pattern reveals many interesting observations, the most significant ones being (1) the direct relation between the percentage yarn strength utilization in fabric with the uniformity of strain levels along the two principal directions and (2) a significant difference in the strain distribution of samples tested along warp and weft directions irrespective of the construction.
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Tumajer, Petr, Petr Ursíny, Martin Bílek, Eva Mouckova, and Martina Pokorna. "Influence of structure of the yarn on mechanical characteristics of yarns exposed to dynamic stress." Autex Research Journal 12, no. 2 (October 1, 2012): 44–49. http://dx.doi.org/10.2478/v10304-012-0009-5.
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Abstract This paper is a direct follow-up of the paper [1] describing in detail the VibTex equipment, which facilitates testing of textiles in a wide range of frequencies of their extension, as well as the determination of corresponding dynamic modules and loss angles. This equipment has been employed for testing polyester yarns of concordant fineness manufactured on ring and rotor spinning frames. At the same time, the material concerned has been subjected to a standard strength test. Therefore, the results of experimental measuring published in this paper allow us to assess the effect of the chosen spinning technology upon the mechanical properties of polyester yarns both at their static and dynamic loading. The introductory section of the paper contains a theoretical analysis of the effect of the chosen manner of spinning upon the mechanical characteristics of yarns. The experimental section indicates the results of measurements at static and dynamic loading, and the final section of the paper confronts the obtained pieces of knowledge with theory. This paper is part of a larger group of publications concerned with the behaviour of various linear textiles when exposed to dynamic loading (see [1], [2], [4], [5], [6]).
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Wang, Yong, Weidong Yu, and Fumei Wang. "Experimental evaluation and modified Weibull characterization of the tensile behavior of tri-component elastic-conductive composite yarn." Textile Research Journal 88, no. 10 (March 28, 2017): 1138–49. http://dx.doi.org/10.1177/0040517517698991.
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In order to clarify the effects of the extension rate and gauge length upon the distribution of tensile strength of tri-component elastic-conductive composite yarn (t-ECCY), experimental as well as theoretical studies have been performed in this paper. Influences of the extension rate and gauge length are highlighted. The yarn exhibits an extension-rate strengthening effect, and the higher extension rate results in a higher strength and fracture strain, irrespective of the gauge length considered, and vice versa. Expressed in terms of gauge length, yarn tenacity shows a drop for a longer testing length at all extension rates, based on the weakest-link theory. A modified two-parameter Weibull strength distribution model, taking into account the effects of extension rate and gauge length, can be reasonably used to quantify the degree of variability in tensile strength and to obtain the individual Weibull parameters for practical applications. Different fracture mechanisms of the t-ECCY are demonstrated at lower and higher extension rates. A “cascade-like” break happens at lower extension rates due to inner sliding, weaker interactive transverse force of individual fibers, and sufficient time available for the fiber realignment. Nevertheless, a “chimney-like” break dominates at higher extension rates by virtue of the reduced reorientation of some disordered fibers and intensive instant impact force of the stainless steel filament component along the load direction.
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Kokol, Vanja, Vera Vivod, Zdenka Peršin, Miodrag Čolić, and Matjaž Kolar. "Antimicrobial properties of viscose yarns ring-spun with integrated amino-functionalized nanocellulose." Cellulose 28, no. 10 (May 27, 2021): 6545–65. http://dx.doi.org/10.1007/s10570-021-03946-z.
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AbstractBio-based, renewable and biodegradable products with multifunctional properties are also becoming basic trends in the textile sector. In this frame, cellulose nanofibrils (CNFs) have been surface modified with hexamethylenediamine/HMDA and used as an antimicrobial additive to a ring-spun viscose yarn. The CNF-HMDA suspension was first characterized in relation to its skin irritation potential, antimicrobial properties, and technical performance (dispersability and suspensability in different media) to optimize its sprayability on a viscose fiber sliver with the lowest sticking, thus to enable its spinning without flowing and tearing problems. The impact of CNF-HMDA content has been examined on the yarn`s fineness, tensile strength, surface chemistry, wettability and antimicrobial properties. The yarn`s antimicrobial properties were increasing with the content of CNF-HMDA, given a 99% reduction for S. aureus and C. albicans (log 1.6–2.1) in up to 3 h of exposure at minimum 33 mg/g, and for E. coli (log 0.69–2.95) at 100 mg/g of its addition, yielding 45–21% of bactericidal efficacy. Such an effect is related to homogeneously distributed CNF-HMDA when sprayed from a fast-evaporated bi-polar medium and using small (0.4 mm) nozzle opennings, thus giving a high positive charge (0.663 mmol/g) without affecting the yarn`s tenacity and fineness, but improving its wettability. However, a non-ionic surfactant being used in the durability testing of functionalized yarn to 10-washing cycles, adheres onto it hydrophobically via the methylene chain of the HMDA, thus blocking its amino groups, and, as such, decreasing its antibacterial efficiency, which was slightly affected in the case when the washing was carried out without using it.
Dissertations / Theses on the topic "Size-effect, yarn strength, yarn testing"
1
Rypl, Rostislav, Rostislav Chudoba, Miroslav Vorechovský, and Thomas Gries. "Evaluation of the Length Dependent Yarn Properties." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-77843.
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The paper proposes a method for characterizing the in-situ interaction between filaments in a multifilament yarn. The stress transfer between neighboring filaments causes the reactivation of a broken filament at some distance from the break. The utilized statistical bundle models predict a change in the slope of the mean size effect curve once the specimen length becomes longer than the stress transfer length. This fact can be exploited in order to determine the stress transfer length indirectly using the yarn tensile test with appropriately chosen test lengths. The identification procedure is demonstrated using two test series of tensile tests with AR-glass and carbon yarns.
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Kaděrová, Jana. "Multi-filament yarns testing for textile-reinforced concrete." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225556.
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The scope of the presented master thesis was the experimental study of multi-filament yarns made of AR-glass and used for textile-reinforced concrete. The behavior under the tensile loading was investigated by laboratory tests. A high number of yarn specimens (over 300) of six different lengths (from 1 cm to 74 cm) was tested to obtain statistically significant data which were subsequently corrected and statistically processed. The numerical model of the multi-filament bundle was studied and applied for prediction of the yarn performance and for later results interpretation. The model of n parallel filaments describes the behavior of a bundle with varying parameters representing different sources of disorder of the response and provides the qualitative information about the influence of their randomization on the overall bundle response. The aim of the carried experiment was to validate the model presumptions and to identify the model parameters to fit the real load-displacement curves. Unfortunately, due to unsuccessful correction of measured displacements devalued by additional non-linear contribution of the unstiff experiment device the load-displacement diagrams were not applicable to model parameters identification. The statistical evaluation was carried only for the maximal load values and the effect of the specimen size (length) on its strength was demonstrated. The size effect curve did not exclude the existence of spatial correlation of material mechanical properties modifying the classical statistical Weibull theory.
Conference papers on the topic "Size-effect, yarn strength, yarn testing"
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Abd Rahman, Siti Humairah, Anatoly Medvedev, Andrey Yakovlev, Yon Azwa Sazali, Bipin Jain, Norhasliza Hassan, and Cameron Thompson. "Development of New Geopolymer-Based System for Challenging Well Conditions." In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21371-ms.
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Abstract With the development of new oil formations and with the advent of new directions in the global energy sector, new requirements for materials for well construction appear. With the close attention to environmental footprint and unique properties, one of the promising materials for well cementing is geopolymers. Being a relatively new material, they are characterized by low carbon footprint, high acid resistance and attractive mechanical properties. This article is aimed at developing new geopolymer slurries for the oil industry, their characterization and field implementation analysis. With the ultimate goal of developing a methodology for the analysis of raw materials and designing the geopolymer slurries, studies were carried out on various raw materials, including different types of fly ash. Based on the data obtained and rapid screening methods, an approach was developed to formulate a geopolymer composition recipe. Since not all cement additives directly work in geopolymers, special attention was paid to control the thickening time and fluid loss. The methods of XRD, XRF, ICP-MS, density, particle size distribution measurements as well as API methods of cement testing were used to understand the composition and structure of the materials obtained, their properties and design limitations. A special approach was applied to study the acid resistance of the materials obtained and to compare with conventional cements and slags. Using one of the most common sources of aluminosilicate, fly ash, formulations with a density of 13.5 – 16.5 lbm/galUS were tested. A sensitivity analysis showed that the type of activator and its composition play a critical role both in the mechanical properties of the final product and in the solidification time and rheological properties of the product. The use of several samples of fly ash, significantly different in composition, made it possible to formulate the basic rules for the design of geopolymers for the oil industry. An analysis was also carried out on 10 different agents for filtration and 7 moderators to find a working formulation for the temperature range up to 100°C. The samples were systematically examined for changes in composition, strength, and acid resistance was previously measured. Despite the emergence of examples of the use of geopolymers in the construction industry and examples of laboratory testing of geopolymers for the oil industry, to the best of our knowledge, there has been no evidence of pumping geopolymers into a well. Our work is an attempt to develop an adaptation of the construction industry knowledge to the unique high pressure, high temperature conditions of the oil and gas industry. The ambitions of this work go far beyond the laboratory tests and involve yard test experiments.