• Title, Summary, Keyword: Fiber Content Ratio

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Studies on the variation of diet fiber content according to pearling ratio of barley (보리의 도정율에 따른 식이섬유 함량 변이에 관한 연구)

  • 조미자
    • Journal of the Korean Home Economics Association
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    • v.33 no.1
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    • pp.181-186
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    • 1995
  • This study was carried out to know the proper pearling ratio for maximum utilizatio of barley diet fiber, especially bata-glucan. Beta-glucan content were 2.35%, 2.72% and 3.24% in pearling ratio of 75%, 70% and 65%, respectively, which means the lower of pearling ratio, the more chance for use of beta-glucan. The embryo was completely removed from barley grain in 65% pearling but it was partially removed or not removed in pearling ratio of 70% and 75%, respectively. Total diet fiber content was higher at 75% pearling ratio while beta-glucan content was the lowest. The higher level of total diet fiber in lower pearling ratio was due to relatively higher content of insoluble diet fiber. The difference of soluble fiber due to pearling ratio was negligible diet fiber. The difference of soluble fiber due to pearling ratio was negligible, however, bata-glucan content was higher in higher pearling ratio. The results implied that it is better way to lowering perling ratio for miximum use of bata-glucan in barley.

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Effects of Fiber Aspect Ratio, Fiber Content, and Bonding Agent on Tensile and Tear Properties of Short-Fiber Reinforced Rubber

  • Lee, Dong-Joo;Ryu, Sang-Ryeoul
    • Journal of Mechanical Science and Technology
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    • v.15 no.1
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    • pp.35-43
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    • 2001
  • Both tensile and tear properties of short-fiber reinforced Chloroprene rubber have been studied as functions of the fiber aspect ratio and fiber content. Both properties increased when both the fiber aspect ratio and fiber content were increased. The fiber reinforced rubbers exhibited maximum values of these properties at a fiber aspect ratio of about 300. When the fiber aspect ratio exceeds 400, the mechanical properties decreased with the fiber content because of the non-uniform dispersion of fibers. The tensile modulus was compared with the prediction by the Halpin-Tsai equations for randomly oriented cases. A bonding agent was used in the fiber treating process. It was found that the ultimate tensile strength, torque, tearing energy and tensile modulus of the rubbers with treated fibers were much higher than those with untreated ones.

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A Study on the Fiber Orientation and Fiber Content Ratio Distribution during the Injection Molding for FRP (FRP의 사출성형에 있어서 섬유배향상태와 섬유함유율분포에 관한 연구)

  • Kim J. W.;Lee D. G.
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.252-257
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    • 2005
  • Injection molding is a very important industrial process for the manufacturing of plastics objects. During an injection molding process of composites, the fiber-matrix separation and fiber orientation are caused by the flow of molten polymer/fiber mixture. As a result, the product tends to be nonhomogeneous and anisotropic. Hence, it is very important to clarify the relations between separation' orientation and injection molding conditions. So far, there is no research on the measurement of fiber orientation using image processing. In this study, the effects of fiber content ratio and molding condition on the fiber orientation-angle distributions are studied experimentally. Using the image processing method, the fiber orientation distribution of weld-line in injection-molded products is assessed. And the effects of fiber content and injection mold-gate conditions on the fiber orientation are also discussed.

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A Stydy on Steel Wire Fiber Reinforced Refractory Castable (철근 캐스터블 내화물의 고온특성에 관한 연구)

  • 박금철;최영섭;한문희;장영재;박근원
    • Journal of the Korean Ceramic Society
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    • v.17 no.2
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    • pp.69-74
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    • 1980
  • This study deals with the wire content, wire diameter, aspect ratio , it's arrangement of steel, wire fiber and the sorts of castable which affected the character of steel wire fiber reinformced refractory castable. Two kinds of alumina based refractory castables, one is for 1650℃ and the other is for 1800℃, and stainless steel which is SUS 304 type 0.25, 0.34 , 0.37 and 0.50m/min diameter were used respectively. Aspect ratio was adjusted to 50, 75, 100 and steel fiber content was also adjusted to 1-4wt% each. The results of the experiment were as follows : 1. At firing temperature around 1,000℃, MOR is increased with increasing wire content and aspect ratio with decreasing firing temperature, which depends on the Romualdi's Fiber Spacing Theory. But for calculation of the fiber spacing, Swamy equation is more a aplicable to the extensive fiber mixing conditions. However, the condition differs from the above at firing temperature around 1,350℃ ,because of the degradation of wire and the progress of sintering of castable. 2. Linear change is getting larger corresponding to the increase of wire content, and the spaling resistivity is increasing corresponding to the increase of wire content and to aspect ratio, and with decreasing wire diameter. 3. Firing shrinkage under load is getting greater as higher wire content, and the shrinkage of the test pieces which fiber is vertically oriented is getting greater than the test pieces which fiber is randomly oriented.

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Effect of Fiber Orientation and Fiber Contents on the Tensile Strength in Fiber-reinforced Thermoplastic Composites (섬유배향과 섬유함유량이 섬유강화 열가소성수지 복합재료의 인장강도에 미치는 영향)

  • Kim, Jin-Woo;Lee, Dong-Gi
    • Composites Research
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    • v.20 no.5
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    • pp.13-19
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    • 2007
  • Fiber-reinforced thermoplastic composites not only approach almost near to the strength of thermosetting composite but also has excellent productivity, recycling property, and impact resistance, which are pointed as weaknesses of thermosetting composites. The study for strength calculation of one direction fiber-reinforced thermoplastic composites and the study measuring precisely fiber orientation distribution were presented. Need the systematic study for the data base that can predict mechanical properties of composite material and fiber orientation distribution by the fiber content ratio was not constructed. Therefore, this study was investigated what affect the fiber content ratio and fiber orientation distribution have on the strength of composites. Fiber-reinforced thermoplastic composites by changing fiber orientation distribution and the fiber content ratio were made. Tensile strength ratio of $0^{\circ}$ direction of fiber-reinforced composites increased being proportional the fiber content and fiber orientation function as change from isotropy(J=0) to anisotropy(J=1). But, tensile strength ratio of $90^{\circ}$ direction by separation of fiber filament decreased when tensile load is imposed fur width direction of reinforcement fiber length direction.

Mechanial and Drying Shrinkage Properties of Polypropylene Fiber Reinforced High Flow Concrete (폴리프로필렌 섬유보강 고유동 콘크리트의 역학적 및 건조수축 특성)

  • Noh , Kyung-Hee;Sung , Chan-Yong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.46 no.5
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    • pp.79-85
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    • 2004
  • This study was performed to evalute mechanical and drying shrinkage properties of polypropylene fiber reinforced high flow concrete. The compressive strength and drying shrinkage ratio were increased with increasing the binder volume ratio and decreased with increasing the content of polypropylene fiber. The splitting tensile strength was increased with increasing the binder volume ratio and the content of polypropylene fiber. The flexural strength was increased with increasing the binder volume ratio and increased by the polypropylene fiber content 0.4%, but above the polypropylene fiber content 0.6% was decreased. This concrete can be used for high flow concrete.

Mechanical Properties of Steel-Fiber Reinforced Concrete (강섬유보강콘크리트의 역학적 거동 특성)

  • 홍성구;권숙국
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.31 no.3
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    • pp.81-91
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    • 1989
  • The aims of this study were to determine mechanical properties of steel-fiber reinforced concrete under splitting tensile, flexural and compressive loading, and thus to improve the possible applications of concrete. The major factors experimentally investigated in this study were the fiber content and the length and the diameter of fibers. The major results obtained are summarized as follows : 1.The strength, strain, elastic modulus and energy obsorption capability of steel-fiber reinforced concrete under splitting tensile loading were significantly improved by increasing the fiber content or the aspect ratio. 2.The flexural strength, central deflection, and flexural toughness of steel4iber reinforced beams were significantly improved by increasing the fiber content or the aspect ratio. And flexural behavior characteristic was good at the aspect ratio of about 60 to 75. 3.The strength, strain, and energy absorption capability in compression were increased with the increase of the fiber content. These effects were not so sensitive to the aspect ratio. The energy absorption capability was improved only slightly with the increase of the fiber length. 4.The elastic modulus, transverse strains, and poisson's ratios in compression were not influenced by the fiber content. 5.The steel-fibers were considered to be appropriated as the materials covering the weakness of concrete because the mechanical properties of concrete in tension and flexure were significantly improved by steel-fiber reinforcement.

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Effect of Fiber Orientation on the Tensile Strength in Twisted Yarn Composites (Twisted Yarn 복합재료에서 인장강도에 미치는 섬유배향의 영향)

  • Lee, Dong-Ki;Sim, Jae-Ki;Kim, Hyuk;Kim, Jin-Woo;Lee, Jung-Ju;Lee, Ha-Wook
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.422-425
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    • 2003
  • Investigated whether fiber orientation distribution of twisted yarn composites and the fiber content are 0$^{\circ}$ and 90$^{\circ}$ direction tensile strength and some correlation. Tensile strength of 0$^{\circ}$ directions of twisted yarn composites increased changelessly being proportional the fiber content and fiber orientation function get into anisotropic in isotropic. But, tensile strength ratio by separation of fiber filament of 90$^{\circ}$ directions tensile strength decreased when tensile load is imposed for width direction of reinforcement fiber. 0$^{\circ}$ and 90$^{\circ}$ direction tensile strength ratio value of a twisted yarn composites not receive almost effect of the fiber content of fiber orientation function J = 0.4 lows. Although do, 20 wt% of the fiber content is high about 0$^{\circ}$ and 90$^{\circ}$ direction tensile strength ratio about 1.6~2 than 10 wt% from J = 0.4. Therefore. could know that effect of the fiber content is dominate.

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Effect of Interphase Condition and Fiber Content on the Dynamic Properties of Short-fiber Reinforced Chloroprene Rubber (계면상 조건과 단섬유 함유량이 단섬유 강화CR의 동적특성에 미치는 영향)

  • Ryu, Sang-Ryeoul;Lee, Dong-Joo
    • Proceedings of the KSME Conference
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    • pp.1151-1156
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    • 2003
  • The dynamic properties of short-fiber reinforced Chloroprene rubber for vibration isolators have been studied as functions of interphase conditions and fiber content. The loss factor showed the maximum at strain amplitude 2%, and increased 0.09 for matrix, 0.05 for reinforced rubber with increasing frequency respectively. The dynamic ratio rapidly decreased with increasing strain amplitude, and some increased with increasing frequency. The better interphase condition showed the lower dynamic ratio. Therefore, the short-fiber reinforced rubber could have the better isolation in frequency ratio(${\sqrt{2}}min$.) compared to frequency ratio(${\sqrt{2}}max$.). And we have investigate the possibility of applying short-fiber reinforced rubber to automotive engine mount.

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The Fracture Toughness and Crack Propagation behavoir of Short-fiber Reinforced Ruber (단섬유 강화고무의 파괴인성 및 크랙진전 거동)

  • Ryu, Sang-Ryeoul;Lee, Dong-Joo
    • Proceedings of the KSME Conference
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    • pp.85-90
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    • 2000
  • The fracture toughness and crack propagation behaviors of short nylon66 fiber reinforced Chloroprene rubber nave been Investigated as functions of fiber aspect ratio, fiber content and interphase conditions. The J for crack initiation and rupture were determined for short-fiber reinforced rubber. The values of $J_c$ for most reinforced rubbers were low compared that of matrix. But, $J_r$ at rupture showed a higher value than that of matrix. The crack propagation behaviors were analyzed into 3 patterns with increasing fiber aspect ratio and fiber content. The tearing mechanisms of matrix and fiber reinforced rubber were observed by CCD camera focused on the tip of crack and load-displacement graph. Both cases showed a completely different behaviors

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