• Title, Summary, Keyword: Tensile Properties

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Comparative Study on the Effects of Ginning and Carding Methods on Tensile Properties of Cotton Fibers from Processing Stages and Garments (방적공정 및 의류 내 면섬유 인장성능에 대한 조면 및 소면공정의 비교연구)

  • Doh, Song-Jun
    • Textile Science and Engineering
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    • v.46 no.3
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    • pp.174-180
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    • 2009
  • Ginning and carding processes, as opening processes of cotton spinning, give both positive and negative influences on tensile properties of cotton fibers. These processes open and clean harvested fibers while result in decrease in breaking strength and breaking elongation of fibers. In this paper the changes in tensile properties from the opening process to steps of repeated washing/drying of garments were measured and analyzed based on the results of tensile tests on individual cotton fibers. We ginned cottons with three ginning rates and analyzed the tensile properties. It seemed that a certain threshold value of processing rate exists for showing critical detrimental effects on breaking strength of individual fibers while higher process rate resulted in increase in breaking elongation. Compared to tensile properties of hand-ginned cotton, processes performed by opening machine damaged tensile properties of fibers significantly. Subsequent processes (carding, before/after garment laundering) in addition to the ginning process also influenced the tensile properties significantly. While the tensile strength of individual fibers decreased during spinning and knitting processes, the breaking elongation decreased significantly during repeated laundering stages. These phenomena can be explained by the fact that dry processes affect tensile strength while wet processes tensile elongation of individual fibers.

Analyzing the Relationship between Tensile Properties and Components of Basalt Fibers Based on the Least Square Method (최소 자승법에 의한 현무암 섬유의 성분 - 인장성 해석)

  • Lee, Hyun U.;Lim, Jung H.;Huh, You
    • Textile Science and Engineering
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    • v.53 no.4
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    • pp.250-256
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    • 2016
  • Properties of material consisting of several components are dramatically influenced by the portion distribution and structural array of the components. In particular, mineral fibers contain several natural components and have significant variations in mechanical properties, as the portions of the components vary in each spinning process. This research aims at providing information on the influence of the components on the mechanical properties of basalt fibers, which is adopted as the experimental material, through experiments. For this purpose, the mechanical properties of the multi-component material are expressed in terms of linear combinations of the weight portions of the ingredients. By melting basalt rocks and spinning them into fibers, we prepared specimens to measure the amounts of the components and the tensile strength, tensile strain at breakage, and the tensile modulus. As the basalt ingredients cannot be controlled arbitrarily, the effects of individual components on the tensile properties of basalt fibers could not be easily separated. In this research, the contribution of each component to the tensile properties was expressed in terms of a linear model with multi-variables. Then, the model coefficients were obtained by applying the least square method to a loss function that was defined in terms of the errors between the estimated values of the tensile properties from the model and the measured values from the experiments. Results show that Ca had the most significant positive influence on the tensile properties with relative model coefficients of 16 (strength), 10 (strain at break), and 6 (modulus); while K and Si had the most significant negative influence on the tensile properties. Si showed the greatest negative effect on the tensile strength with a relative model coefficient of 10, and on the strain at break with a relative model coefficient of 6, while K had the most negative effect on the tensile properties in an absolute sense.

Study on the Effects of Single Fiber Tensile Properties on Bundle Tensile Properties through Estimation of HVI Bundle Modulus and Toughness

  • Koo, Hyun-Jin;Jeong, Sung Hoon;Suh, Moon W.
    • Fibers and Polymers
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    • v.2 no.1
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    • pp.144-147
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    • 2001
  • The HVI properites and Mantis single fiber tensile properties were analyzed to evaluate the relationship between fiber and bundle tensile properties. For this study, a new method has been developed for estimating the modulus and toughness of cotton fiber bundles directly from the HVI tenacity-elongation curves. The single fiber tensile properties were shown to be translated well into the bundle tensile properties. The single fiber breaking elongation was found to be the most significant contributing factor to bundle tensile properties. The bundle breaking elongation and toughness were shown to increase as the single fiber breaking elongation increased. The bundle modulus increased as the single fiber breaking elongation and/or standard deviation of single fiber breaking elongation decreased.

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Tensile Properties of Tricot Depending on the Direction of Power Film and Tensile Axis for the Design of Sportswear (파워 필름 부착과 인장축 방향 변화에 따른 스포츠웨어용 트리코의 인장특성)

  • Choi, Jiyoung;Hong, Kyunghi
    • Textile Science and Engineering
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    • v.49 no.4
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    • pp.200-209
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    • 2012
  • For the optimum performance of compression sportswear, tensile properties of base tricot and power film should be understood in the viewpoint regarding the use condition. However, it is difficult to predict the tensile properties of film-welded tricot, solely from the tensile information of the single layer of tricot or power film itself, especially when the direction of the power film does not follow the wale or course direction of the tricot, which often occurs in the actual design of performance sportswear. In this study, changes in the tensile properties of tricot, power film and film-welded tricot were investigated as the angle of tensile axis and the direction of welding varies from$0^{\circ}$ to $90^{\circ}$. Stress, initial modulus, and tensile energy were obtained up to 33~50% of the extension level, which is often observed in actual use. Results indicate that the area of power film matched to the tensile axis and width of power exertion is the key factor of tensile properties explaining stress, initial modulus and energy required during extension. Moreover, the results obtained in this study can be utilized in the arrangement of pattern piece for tricot and the positioning of power film to achieve the right support and extension level during body movement.

A Comparison of Tensile and Puncture Properties of Nonwoven Fabrics (부직포의 인장특성과 꿰뚫림특성에 관한 비교분석)

  • ;;Tushar K. Ghosh
    • Textile Science and Engineering
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    • v.37 no.2
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    • pp.103-110
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    • 2000
  • Although many papers have been published on the mechanical properties of nonwoven fabrics, there is no report on the relationship between tensile and puncture properties. For the further application of lightweight nonwoven products in uses such as protective materials, the complete understanding of this relationship should be needed when they are subjected to puncture force. The objectives of this research are to assess the tensile properties with different tensile test methods and to compare the theoretical puncture force calculated by tensile property and experimental puncture force. In the our work, two test methods were used for the tensile properties: uniaxial and biaxial tests. The tensile strength of MD and CD direction. If the condition of tensile test was similar to puncture test, the test method would be in good agreement for predicting the puncture forces. A good correlation between calculated and experimental puncture forces was obtained in the order of biaxial, wide width strip, cut strip, and grab methods.

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Evaluation of Tensile Properties in Small Punch Test Using Finite Element Analysis (유한요소해석을 이용한 소형펀치시험에서의 인장물성평가)

  • Lee, Jae-Bong;Kim, Min-Chul;Park, Jai-Hak;Lee, Bong-Sang
    • Proceedings of the KSME Conference
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    • pp.31-36
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    • 2003
  • In this study a relationship between SP curves and tensile properties was investigated by FE analysis on SP test with various assumed tensile properties. For the accuracy of FE analysis, SP test and tensile test were performed and those results were compared with FE analysis results. The yield load(Py) defined from the intersection point of two lines tangent to the elastic bending region and plastic bending region. And it was related specifically with yield stress(${\sigma}_0$) in FE analysis result curves. The slopes of FE analysis result curves normalized by yield stress(${\sigma}_0$) reflected the change of tensile properties regardless of yield stress(${\sigma}_0$) variation. Empirical relations were derived from these results. Tensile properties from these relations showed good agreement in FE analysis curve and tested curve.

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Tensile Properties of Plain Weave Glass Fabric Reinforced Epoxy Resin Laminates at Low Temperatures (평직유리섬유 강화 에폭시 적층판의 저온 인장 특성)

  • Kim, Yon-Jig
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.32 no.9
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    • pp.788-795
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    • 2008
  • To understand the tensile behaviors of GFRP at low temperature, three types of specimen have been used in this study. Tensile properties and fracture mechanisms for three orthogonal orientations of plain weave glass fabric reinforced epoxy resin laminate were investigated at temperature range of about -30 to $15^{\circ}C$. The tensile properties of axial and edge type specimen decrease slightly with decreasing temperature to $-20^{\circ}C$. However, at $-30^{\circ}C$ the decreases in the tensile properties increased considerably. Below $-20^{\circ}C$, thickness type specimen showed a marked decreases in the tensile properties. It was obvious that the fracture manner of thickness type specimen was adhesive failure at above $-10^{\circ}C$ and a mixed adhesive and cohesive failure at below $-20^{\circ}C$.

Studies on the Uni-axial Tensile Properties of Simplex Warp Knitted Fabrics (심플렉스경편포의 일축신장특성에 관한 연구)

  • 박신웅
    • Textile Science and Engineering
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    • v.17 no.1
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    • pp.32-40
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    • 1980
  • The structures of the simplex knit fabrics were made of double faced single tricot theoretically, but its tensile properties is very different from the single tricot's. Simplex's tensile properties is divided into two regions, i.e, the structural effective region and the yarn's tensile region. This study was made on the theoretical modeling of the simplex stitch with relation to the yarn's tensile properties. After comparing experimental and theoretical ones between two regions, we obtained the following results: 1. The theoretical results were correlated well to the experimental's. 2. The factors relating to the tensile properties were devided to such properties as wale and course density, needle gauge between front and back needles, and thickness of the knit fabrics. 3. If it is possible to analyse of stitch length of the simplex fabrics, knit contraction of the simplex fabrics could be obtainable.

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Tensile Properties of CFRP Rod and U Type Anchor manufactured by UCAS Method (UCAS 공법에 의해서 제작된 CFRP rod와 U형 앵커의 인장특성)

  • Seo, Seung-Tag
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.4
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    • pp.309-315
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    • 2006
  • Important material properties of UCAS rod can divide by tension characteristic of base rod part and both end part of U type anchor. Tensile properties of base rod part need as concrete reinforcement material as an alternative material of reinforcing rod, and tensile properties of U type anchor is used at connection with UCAS rod. This treatise carry out tensile test of UCAS rod, examine necessary properties such as strength, elastic modulus and maximum capacity of UCAS rod as reinforcement material of concrete. Also, to examine material properties carry out tensile test of U type anchor.

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Measurement of Tensile Properties of Copper foil using ESPI technique (ESPI 기법을 이용한 동 박막의 인장 특성 측정)

  • 권동일;허용학;김동진;박준협;기창두
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.1059-1062
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    • 2003
  • Micro-tensile testing system has been developed and micro-tensile tests for copper foil have been carried out. The system consisted of a micro tensile loading system and a micro-ESPI system for measuring strain. The loading system has a maximum loading capacity of 50N and a stroke resolution of 4.5nm. Stress-strain curves for the electro-deposited copper foil with the thickness of 18$\mu\textrm{m}$ were obtained, and tensile properties, including elastic modulus, yielding strength and tensile strength, were determined. The tensile properties obtained under three different conditions of testing speed showed a dependency on the speed.

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