• Title/Summary/Keyword: Tensile properties

Search Result 891, Processing Time 0.213 seconds

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
    • /
    • v.2 no.1
    • /
    • pp.144-147
    • /
    • 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.

  • PDF

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
    • /
    • v.46 no.3
    • /
    • pp.174-180
    • /
    • 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.

A Study on the Tensile Properties of Plain Rib Knitted Fabrics(III) -The Course and Wale-wise Stress-Strain Curves during Deformation Process after the Limiting Stretch Ratio- (Plain Rib 편포의 신장특성에 관한 연구(III) -한계신장비 후의 신장곡선에 대하여-)

  • 이덕래
    • Textile Science and Engineering
    • /
    • v.24 no.3
    • /
    • pp.8-12
    • /
    • 1987
  • In order to investigate the tensile properties of the plain rib knitted fabric, a three-dimensional model of the limited stretch was established. For the tensile properties of the plain rib knitted fabrics, the yarn diameter, the yarn elongation, the frictional coeffcient of the yarn, and the course and wale spacings were taken as the parameters. An equation that could represent the effect of these parameters on the tensile properties was formulated by using them.

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

  • 박신웅
    • Textile Science and Engineering
    • /
    • v.17 no.1
    • /
    • pp.32-40
    • /
    • 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.

Microstructure and Mechanical Properties of AZ91 Magnesium Alloy Containing a Small Amount of Sn (미량 Sn을 함유한 AZ91 마그네슘 합금의 미세조직 및 기계적 특성)

  • Jun, Joong-Hwan
    • Journal of the Korean Society for Heat Treatment
    • /
    • v.27 no.3
    • /
    • pp.115-120
    • /
    • 2014
  • Microstructural features were comparatively investigated in AZ91 (Mg-9%Al-1%Zn) and AZ91-0.5%Sn alloys, in order to clarify the reason for the enhancement in room temperature tensile properties by the addition of small amount of Sn in Mg-Al-based alloy. In as-cast state, the Sn-containing alloy showed increased YS, UTS and elongation than the Sn-free alloy. The microstructural examination revealed that various factors including finer cell size, reduction of lamellar (${\alpha}+{\beta}$) phase and morphological change of bulky ${\beta}$ phase from partially divorced shape to fully divorced shape, are likely to be responsible for the improvement in tensile properties for the Sn-containing alloy. It is noted that two alloys showed similar tensile properties after solution treatment. This implies that microstructural evolution related to the ${\beta}$ phase plays a key role in better tensile properties in the Sn-containing alloy.

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
    • /
    • /
    • pp.31-36
    • /
    • 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.

  • PDF

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
    • /
    • v.32 no.9
    • /
    • pp.788-795
    • /
    • 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 $-20^{\circ}C$.

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
    • /
    • v.53 no.4
    • /
    • pp.250-256
    • /
    • 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.

Estimation of Measurement Uncertainty in Evaluation of Tensile Properties (인장 물성 측정 불확도 평가)

  • Huh, Y.H.;Lee, H.M.;Kim, D.J.;Park, J.S.
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.1
    • /
    • pp.73-78
    • /
    • 2010
  • Estimation of tensile properties measurement uncertainty of material was carried out. Sources of uncertainty affecting the measurement of tensile properties were classified and analyzed. The models for uncertainty evaluation of measurands to be determined from tensile test, such as elastic modulus, yield strength and tensile strength, were suggested and derived from the mathematical relations, corresponding to the respective measurands, and the measuring quantities by calculating each sensitivity coefficient of the quantities. Based on these models, the uncertainty of the tensile properties was evaluated from the experimental data of SUS316LN determined according to ISO 6892.

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
    • /
    • v.49 no.4
    • /
    • pp.200-209
    • /
    • 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.