• Title, Summary, Keyword: tensile property

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Analysis on the Tensile Property of Hanji(I) - Theoretical Consideration - (한지의 인장특성 해석(I) - 이론적 고찰 -)

  • Park, Tae-Young;Joo, Chang-Whan
    • Textile Science and Engineering
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    • v.46 no.3
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    • pp.181-186
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    • 2009
  • Owing to formation of fiber fibrillation and application of binder bonding, pressing device, and curing process, the characteristic of prepared Hanji(korean traditional paper) is a thin structure, relatively high tensile strength and stiffness. To predict tensile property of Hanji, in the present work, a theoretical equation including tensile property of fiber, curl factor, orientation distribution function, and Poisson's ratio of Hanji was derived in consideration of fiber stress limit, slippage effect, and thickness. For accurate tensile property of Hanji, new definition of fiber stress limit was introduced. By applying the concept of finer tape yarn and thickness factor, this paper modified the earlier prediction theory of tensile stress of the nonwoven fabrics. In a next paper, the comparative analysis between this theoretical theory and experimental tensile behavior of Hanji will be discussed.

Manufacturing Technology of Thin Foil Tensile Specimen Using Cold Isostatic Press and Precision Mechanical Property Measurement Technology (냉간 등방압 성형기를 이용한 미세박판 인장시험시편 가공기술 및 정밀 기계적 물성 측정기술)

  • Lee H. J.;Park H. J.;Lee N. K.;Kim S. S.;Lee H. W.;Hwang J. H.;Park J. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.245-248
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    • 2005
  • This paper is concerned with manufacturing technology of thin foil tensile specimen using CIP(Cold Isostatic Press) and measurement of precision mechanical property. This thin foil tensile specimen manufacturing technology is a method that can make a metal thin foil specimen for micro tensile testing. We can get a burr free micro metallic thin foil specimen using this technology. For testing mechanical property of this micro thin foil, we use a nano scale material testing machine that was developed by KITECH. In this paper, micro tensile specimens of nickel and copper thin foil are fabricated with CIP and precision mechanical properties of these materials could be measured. We will expect that precision mechanical property of micro/nano material and component. Micro and Nano mechanical property can be measured using this technology and mechanical property data base of micro/nano material and component can be constructed.

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A Study on the Manufacturing and Tensile Property of Woven Geotectile from Polypropylene Slit Film Yarns (슬리트 필름사를 이용한 폴리프로필렌 지오텍스타일의 제조와 인장특성에 관한 연구)

  • 박태영
    • Textile Science and Engineering
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    • v.38 no.10
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    • pp.523-531
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    • 2001
  • Polypropylene woven geotextile(PWG), one of the important geosynthetics, has been widely used as materials of reinforcement and separation in the civil engineering field. But there have been no systematic reports about the physical property and structural factor of PWG in the textile engineering aspect. In this study, reproducibility of PWG production and influence of fabric design factor on the tensile property were evaluated. The results indicated that development of high denier weft film yarn, soft and multi-layer structure, was essential to produce high strength PWG (>10t/m) and to ensure good reproducibility o the tensile properties of PWG. And in order to produce PWG satisfying the demanded tensile property, selection of suitable yarn denier and threads per inch was necessary. Tensile strength of PWG decreased on exposure to daylight, and especially exposure condition had a fatal effect on the tensile strength of light weight PWG.

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Effect of Scrap Content on the Hot Tearing Property and Tensile Property of AC2BS Alloy (AC2BS합금의 열간 균열강도 및 인장특성에 미치는 스크랩 함량의 영향)

  • Kwon, Yong-Ho;Kim, Heon-Joo
    • Journal of Korea Foundry Society
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    • v.36 no.2
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    • pp.67-74
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    • 2016
  • The effects of scrap content on the hot tearing property and tensile property were investigated in AC2BS alloy. The hot tearing strengths were $16.4kgf/cm^2$, $15.2kgf/cm^2$, $14.9kgf/cm^2$ and $13.3kgf/cm^2$, respectively, under the constant solid fraction of 29.3% when the scrap contents of the specimens were 0%, 20%, 35% and 50%. In the same way, tensile strengths of the as-cast condition were $24.5kgf/mm^2$, $23.7kgf/mm^2$, $17.3kgf/mm^2$ and $16.0kgf/mm^2$, respectively, and the corresponding tensile strengths of the T6 heat treatment condition were $27.2kgf/mm^2$, $26.7kgf/mm^2$, $24.2kgf/mm^2$ and $23.9kgf/mm^2$. Hot tearing strength and tensile strength decreased as scrap content of the specimen increased. According to the evaluation of the quantitative hot tearing and tensile test results, the decrease of these strengths is due to the presence of oxide films which act as crack initiation site of the specimens. Therefore, elimination of oxide films of aluminum melt to maintain melt cleanliness is required.

Effect of Chemical Composition on the Microstructure and Tensile Property in TRIP-assisted Multiphase Steels (TRIP형 복합조직강의 미세조직 및 인장성질에 미치는 화학조성의 영향)

  • Lee, K.Y.;Jang, W.Y.;Kang, J.W.
    • Journal of the Korean Society for Heat Treatment
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    • v.16 no.3
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    • pp.127-133
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    • 2003
  • The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types; a granular type in a steel containing higher Si and a film type in a steel having higher C. For the case of higher C-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable Si and Mn, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher Mn content exhibited the similar behavior shown in dual phase steel.

Effect of Chemical Composition on Tensile Property in TRIP-assisted Multiphase Steel for Automobile Structure (차량구조용 변태유기소성(TRIP)형 복합조직강의 인장성질에 미치는 화학조성의 영향)

  • Lee, Ki-Yeol;Bang, Il-Hwan;Ma, Ah-Ram;Kim, Young-Sun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.3
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    • pp.106-113
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    • 2007
  • The effect of chemical composition on the microstructural change and tensile property in TRIP-assisted steels with different chemical composition was investigated by using SEM, TEM, XRD and UTM. As a result of microscopic observation, the morphology of retained austenite could be identified as two types : a granular type in a steel containing higher sillicon and a film type in a steel having higher carbon. For the case of higher carbon-containing steel with a tensile strength of 860 MPa and a total elongation of 38%, film-typed retained austenite could be observed between lath bainitic ferrite. Actually, metastable retained austenite was a requisite for the good formability, which means that chemical composition plays a significant role in the microstructure and tensile property of TRIP-assisted steels. With respect to tensile property, the steels containing suitable silicon and manganese, respectively, showed a typical TRIP effect in stress-strain curve, while a steel containing higher manganese content exhibited the assimilar behavior shown in dual phase steel.

Manufacturing Technology of Thin Foil Tensile Specimen Using CIP and Mechanical Property Measurement Technology (냉간 등방압 성형기를 이용한 미세박판 인장시편의 가공 및 기계적 물성측정 기술)

  • Lee N.K.;Park H. J.;Kim S. S.;Lee H. W.;Hwang J. H.;Park J. H.;Lee H. J.
    • Transactions of Materials Processing
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    • v.14 no.6
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    • pp.509-513
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    • 2005
  • This paper is concerned with manufacturing technology of thin foil tensile specimen using CIP(Cold Isostatic Press) and measurement of precision mechanical properties using micro tensile testing. We can get a burr free micro metallic thin foil specimen using this technology. For testing mechanical property of this micro thin foil, we use a nano scale material testing machine that was developed by KITECH. In this paper, micro tensile specimens of nickel and copper thin foil are fabricated with CIP and precision mechanical properties of these materials could be measured. We will expect precision mechanical property of micro/nano material and component.

A study on the Surface Treatment of Spectra to Improve Tensile Propetry of Spectra/Vinylester Composites (스펙트라/비닐에스테르 복합재료의 인장특성 향상을 위한 스펙트라 표면처리에 관한 연구)

  • 신동혁;이경엽;박상정
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.782-785
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    • 1997
  • In this study, the spectra was surface-treated using $Ar^+$ ion beam to improve the tensile property of spectra/vinylester composites. The effect of surface treatment on the tensile property of spectra/vinylester composites was investigated comparing tensile strength and stiffness of surface-treated spectra/vinylester composites with those of untreated spectra/vinylester composites. The results showed that the tensile strength and stiffness of surface-treated s spectra/vinylester composites were 12% and 22% higher than those of untreated spectra/vinylester composites.

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A Study on the Tensile Characteristics of Spectra/Vinylester Composites with Ion Beam Treatment of Spectra Fibers. (이온빔으로 표면처리한 스펙트라/비닐에스테르 복합재의 인장특성)

  • 신동혁;이경엽
    • Journal of the Korean institute of surface engineering
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    • v.35 no.4
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    • pp.206-210
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    • 2002
  • The use of Spectra fibers as fiber cloth is increasing because of their excellent impact resistance. However, a major limitation on the use of Spectra fibers is a chemical inertness. In this Study, Spectra fibers were surface-treated using Ar$^{+}$ ion beam under oxygen environment to improve the tensile property of Spectra/vinylester composites. The effect of surface treatment of Spectra fibers on the tensile property of Spectra/vinylester composites was determined from tensile tests using Spectra/vinylester composite specimens with and without a hole. It was found that the tensile stiffness and strength of surface-treated case were 22% and 17% higher than those of untreated case for specimens with no hole. The maximum load of surface-treated case was about 15% higher than that of untreated case for specimens with a hole.

Effect of Treatments with Flame-retardant on Flame-resistance and Tensile Strength of Paper (난연 처리가 종이의 난연성 및 인장강도에 미치는 영향)

  • Song, Han-Kyu;Lee, Myoung-Ku
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.38 no.4
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    • pp.61-67
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    • 2006
  • The effect of several inorganic flame-retardants such as ammonium phosphate, ammonium sulfate, aluminum hydroxide and antimony trioxide on the flame-retardant property and tensile strength of paper has been investigated. Flame-retardants were used preferably as a dry powdered mixture and added to the furnish. Both dipping and coating treatments were employed to apply flame-retardants to paper Flame-retardant paper was manufactured by treatment of $5{\sim}30%$ flame-retardants by weight of the paper on a dry weight. Paper's flame-retardant property and tensile strength were examined by comparison of char length and tensile index. As dosages of flame-retardant chemicals increased, flame-retardant property was improved but tensile index was decreased.