• Title, Summary, Keyword: Tensile properties

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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 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 $-20^{\circ}C$.

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 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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A Statistical. Properties of Tensile Behaviors of STS304 Stainless Steel at Elevated Temperature and the Acoustic Emission (STS304 스테인리스강의 고온 인장거동의 통계적 특성과 음향방출)

  • Kwak, Myung-Kyu;Kim, Seon-Jin
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • pp.68-74
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    • 2002
  • The tensile tests to identify the statistical tensile properties and the acoustic emission characteristics were conducted for STS304 stainless steel at $600^{\circ}C,\;700^{\circ}C$. From tensile tests performed by constant cross head speed controls with 1mm/min, rates at each elevated temperature, the scatters were observed in tensile strength, reduction of area, elongation and the acoustic emission parameters. The effect of temperature on the scatter of tensile behavior was larger at $700^{\circ}C$. The distributions of tensile properties was well followed in 3-parameter Weibull. The AE counts and energy of the $700^{\circ}C$ specimens were smaller than the $600^{\circ}C$.

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Effect of Clay Type and Concentration on Optical, Tensile and Water Vapor Barrier Properties of Soy Protein Isolate/Clay Nanocomposite Films

  • Rhim, Jong-Whan
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
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    • v.15 no.3
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    • pp.99-104
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    • 2009
  • Soy protein isolate (SPI)-based nanocomposite films with three different types of nanoclays, such as Cloisite $Na^+$, Cloisite 20A, and Cloisite 30B, were prepared using a solution casting method, and their optical, tensile, and water vapor barrier properties were determined to investigate the effect of nano-clay type on film properties. Among the tested nanoclays, Cloisite $Na^+$, a hydrophilic montmorillonite (MMT), exhibited the highest transparency with least opaqueness, the highest tensile strength, and the highest water vapor barrier properties, indicating Cloisite $Na^+$ is the most compatible with SPI polymer matrix to form nanocomposite films. The film properties of SPI/Cloisite $Na^+$ nanocomposite films were strongly dependent on the concentration of the clay. Film properties such as optical, tensile, and water vapor barrier properties improved significantly (p<0.05) as the concentration of clay increased. However, the effectiveness of addition of the clay reduced above a certain level (i.e., 5wt%), indicating that there is an optimum amount of clay addition to exploit the full advantage of nanocmposite films.

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Finite Element Analysis on the Effect of the Surface Roughness on the Tensile Properties of Pure Titanium (순 타이타늄 인장 물성에 미치는 표면 거칠기의 영향에 대한 유한요소해석)

  • Baek, S.M.;Moon, J.H.;Kim, H.S.
    • Transactions of Materials Processing
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    • v.26 no.2
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    • pp.108-114
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    • 2017
  • Titanium based implants are known to improve their osseointegration by controlling surface roughness from nanometers to micrometers. Implants continuously and/or repeatedly receive irregular loads in the human body, and require a deeper understanding of the tensile and fatigue properties that can determine the fracture characteristics of the materials. In this study, the plastic deformation behavior which depends on the surface geometry of the materials during tensile tests was analyzed using the finite element method. As a result, the tensile properties were greatly decreased with increasing the sharpness of the surface. On the other hand, the average roughness had no significant effect on tensile properties. This investigation shed a light on developing titanium implants with improved osseointegration by surface treatments.

Evaluation of Tensile Properties of Cast Stainless Steel Using Ball Indentation Test

  • Kim Jin Weon
    • Nuclear Engineering and Technology
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    • v.36 no.3
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    • pp.237-247
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    • 2004
  • To investigate the applicability of automated ball indentation (ABI) tests in the evaluation of the tensile properties of cast stainless steel (CSS), ABI tests were performed on four types of unaged CSS and on 316 stainless steel, all of which had a different microstructure and strength. The reliability of ABI test data was analyzed by evaluating the data scattering of the ABI test and by comparing tensile properties obtained from the ABI test and the tensile test. The results show that the degree of scattering of the ABI test data is reasonably acceptable in comparison with that of standard tensile data, when two points data that exhibit out-of-trend are excluded from five to seven points data tested on a specimen. In addition, the scattering decreases slightly as the content of ${\delta}-ferrite$ in CSS increases. Moreover, the ABI test can directly measure the flow parameters of CSS with error bounds of about ${\pm}10\%$ for the ultimate tensile stress and the strength coefficient, and about ${\pm}15\%$ for the yield stress and the strain hardening exponent. The accuracy of the ABI test data is independent of the amount of ${\delta}-ferrite$ in the CSS.

A Study of the Tensile Properties for Poly(trimethylene terephthalate, PTT) 1×1 Rib Knitted fabrics (Poly(trimethylene terephthalate, PTT) 1×1리브 편성물의 신장특성에 관한 연구)

  • Choi, Jae-Woo;Jang, Boung-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.9 no.4
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    • pp.337-341
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    • 2006
  • The tensile properties of Poly(trimethylene terephthalate, PTT) $1{\times}1Rib$ knitted fabrics were experimentally studies, and the specimens has $1{\times}1$ rib stitched structure which are weft knitted fabrics with various lengths of loop. The $1{\times}1$ rib weft knitted fabric showed larger tensile linearity, tensile energy and tensile resilience in the direction of courses. The tensile properties increased with increasing the loop density in all directions, and perfectly increased with the course directions than the wale directions.

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