• Title/Summary/Keyword: metal fiber

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An Experimental Study on the Mechanical Properties of High Performance Concrete with Material for Lateral Confinement (횡구속 재료변화에 따른 고성능 콘크리트의 역학적 특성에 관한 실험적 연구)

  • 김은호;정덕우;홍상희;윤기원;한천구
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.563-568
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    • 2002
  • This paper is a fundamental study on the mechanical properties of the high performance concrete confined with metal lath, glass and carbon fiber laterally. According to the results, it shows that the compressive strength increases by 9%, 8% and 6% in metal lath carbon fiber and glass fiber in case of W/B 30% respectively. In case of W/B 30% and 40%, flecxural strength shows largely in order of carbon fiber, metal lath, glass fiber. In strain-stress curve with the kinds of material for lateral confinement, while brittleness failure occurs in plain concrete just after maximum load, it is improved in some degree in confined concrete due to increase of the strain by increase of toughness. But, elastic modulus shows the similar tendency between confined concrete and plain concrete. Length change ratio by drying shrinkage shows little a bit in order of carbon fiber, glass fiber and metal lath due to confinement.

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Fiber-optic Temperature Sensor Based on Bending Loss of Thermally Expanded Core Fiber (열확장 코어 광섬유의 구부림 손실을 이용한 광섬유형 온도 센서)

  • Kim, Kwang-Taek;Kang, Ji-Hoon;Cho, Kyu-Jung;Moon, Nam-Il
    • Korean Journal of Optics and Photonics
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    • v.21 no.1
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    • pp.12-15
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    • 2010
  • In this paper, we have proposed and demonstrated a simple fiber-optic temperature sensor based on the bending loss of a TEC(thermally expended core) fiber attached to a bi-metal. The deformation of the bi-metal caused by the change in its temperature induces the bending loss of the TEC fiber. The experimental result shows that the temperature sensitivity and operation temperature range of the device are controllable through the adjustment of the structure of the expanded core fiber. The fabrication procedure of the device is described in detail.

Damage Detection of Fiber-Metal Laminates Using Optical Fiber Sensors (광섬유 센서를 이용한 섬유-금속 적층판의 손상 감지)

  • 양유창;한경섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2002.10a
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    • pp.161-164
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    • 2002
  • Optical fiber vibrations sensors (OFVSs) and extrinsic Fabry-Perot interferometer (EFPI) were used in damage monitoring of fiber-metal laminates(FML). The optical fiber vibration sensor and EFPI were applied in order to detect and evaluate the strain, damage and failure of FML. Damages in composites, such as matrix cracks, delamination and fiber breakage may occur as a result of excessive load, fatigue and low-velocity impacts. Tensile test was performed with the measurement of optical signal and acoustic emission (AE). The signals of the optical fiber vibration sensor due to damages were quantitatively evaluated by wavelet transform. EFPI was less sensible to the damage signals compared with the optical fiber vibration sensor. It was found that damage information of comparable in quality to acoustic emission data could be obtained from the optical fiber vibration sensor signals.

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Comparison of the fracture resistances of glass fiber mesh- and metal mesh-reinforced maxillary complete denture under dynamic fatigue loading

  • Im, So-Min;Huh, Yoon-Hyuk;Cho, Lee-Ra;Park, Chan-Jin
    • The Journal of Advanced Prosthodontics
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    • v.9 no.1
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    • pp.22-30
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    • 2017
  • PURPOSE. The aim of this study was to investigate the effect of reinforcing materials on the fracture resistances of glass fiber mesh- and Cr-Co metal mesh-reinforced maxillary complete dentures under fatigue loading. MATERIALS AND METHODS. Glass fiber mesh- and Cr-Co mesh-reinforced maxillary complete dentures were fabricated using silicone molds and acrylic resin. A control group was prepared with no reinforcement (n = 15 per group). After fatigue loading was applied using a chewing simulator, fracture resistance was measured by a universal testing machine. The fracture patterns were analyzed and the fractured surfaces were observed by scanning electron microscopy. RESULTS. After cyclic loading, none of the dentures showed cracks or fractures. During fracture resistance testing, all unreinforced dentures experienced complete fracture. The mesh-reinforced dentures primarily showed posterior framework fracture. Deformation of the all-metal framework caused the metal mesh-reinforced denture to exhibit the highest fracture resistance, followed by the glass fiber mesh-reinforced denture (P<.05) and the control group (P<.05). The glass fiber mesh-reinforced denture primarily maintained its original shape with unbroken fibers. River line pattern of the control group, dimples and interdendritic fractures of the metal mesh group, and radial fracture lines of the glass fiber group were observed on the fractured surfaces. CONCLUSION. The glass fiber mesh-reinforced denture exhibits a fracture resistance higher than that of the unreinforced denture, but lower than that of the metal mesh-reinforced denture because of the deformation of the metal mesh. The glass fiber mesh-reinforced denture maintains its shape even after fracture, indicating the possibility of easier repair.

An Experimental Study on the Spatting Resistance of High Performance Concrete with PP Fiber Contents and Lateral Confinement by Metal-Lath (PP섬유 혼입 및 메탈라스 횡구속에 의한 고성능 콘크리트의 폭열방지에 관한 실험적 연구)

  • 황인성;이백수;이병열;양성환;한천구
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.05a
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    • pp.557-562
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    • 2002
  • This paper describes the results of spalling by fire prevention of high performance concrete confining with metal-lath and containing PP fiber. According to test results, all the specimens without PP fiber shows entire failure after exposed to fire, while the other specimens confined with metal-lath has somewhat better spatting prevention performance than plain concrete specimens, which only show surface scale spatting combination of PP fiber with confinement of metal-lath leads to favorable spatting resistance. As PP fiber contents and thickness of metal-lath which is confined at concrete specimens increase, residual strength after exposed to fire shows to be increased.

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Damage Detection of Fiber-Metal Laminates Under Axial and Indentation Load (섬유-금속 적층판의 인장 및 압입 하중에서의 손상감지)

  • Yang, Yoo-Chang;Han, Kyung-Seop
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.370-375
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    • 2003
  • Optical fiber vibrations sensors (OFVSs) and extrinsic Fabry-Perot interferometer (EFPI) were used in damage monitoring of fiber-metal laminates(FML). The optical fiber vibration sensor and EFPI were applied in order to detect and evaluate the strain, damage and failure of FML. Damages in composites, such as matrix cracks, delamination and fiber breakage may occur as a result of excessive load, fatigue and low-velocity impacts. Tensile and indentation test was performed with the measurement of optical signal and acoustic emission (AE). The signals of the optical fiber vibration sensor due to damages were quantitatively evaluated by wavelet transform. It was found that damage information of comparable in quality to acoustic emission data could be obtained from the optical fiber vibration sensor signals.

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Damage and Failure Detection of Fiber-Metal Laminates Under Indentation Load (섬유-금속 적층판의 압입 하중에서의 손상 및 파손 검출)

  • 양유창;한경섭
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2003.04a
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    • pp.42-45
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    • 2003
  • Optical fiber vibrations sensors (OFVSs) and extrinsic Fabry-Perot interferometer (EFPI) were used in damage monitoring of fiber-metal laminates(FML). The optical fiber vibration sensor and EFPI were applied in order to detect and evaluate the strain, damage and failure of FML. Damages in composites, such as matrix cracks, delamination and fiber breakage may occur as a result of excessive load, fatigue and low-velocity impacts. Indentation test was performed with the measurement of optical signal and acoustic emission (AE). The signals of the optical fiber vibration sensor due to damages were quantitatively evaluated by wavelet transform. It was found that damage information of comparable in quality to acoustic emission data could be obtained from the optical fiber vibration sensor signals.

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Axial buckling response of fiber metal laminate circular cylindrical shells

  • Bidgoli, Ali M. Moniri;Heidari-Rarani, Mohammad
    • Structural Engineering and Mechanics
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    • v.57 no.1
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    • pp.45-63
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    • 2016
  • Fiber metal laminates (FMLs) represent a high-performance family of hybrid materials which consist of thin metal sheets bonded together with alternating unidirectional fiber layers. In this study, the buckling behavior of a FML circular cylindrical shell under axial compression is investigated via both analytical and finite element approaches. The governing equations are derived based on the first-order shear deformation theory and solved by the Navier solution method. Also, the buckling load of a FML cylindrical shell is calculated using linear eigenvalue analysis in commercial finite element software, ABAQUS. Due to lack of experimental and analytical data for buckling behavior of FML cylindrical shells in the literature, the proposed model is simplified to the full-composite and full-metal cylindrical shells and buckling loads are compared with the available results. Afterwards, the effects of FML parameters such as metal volume fraction (MVF), composite fiber orientation, stacking sequence of layers and geometric parameters are studied on the buckling loads. Results show that the FML layup has the significant effect on the buckling loads of FML cylindrical shells in comparison to the full-composite and full-metal shells. Results of this paper hopefully provide a useful guideline for engineers to design an efficient and economical structure.

Mechanical Properties of Cork Composite Boards Reinforced with Metal, Glass Fiber, and Carbon Fiber

  • Min-Seong, CHA;So-Jeong, YOON;Jin-Ho, KWON;Hee-Seop, BYEON;Han-Min, PARK
    • Journal of the Korean Wood Science and Technology
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    • v.50 no.6
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    • pp.427-435
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    • 2022
  • For effective applicability of reinforced cork, cork composites reinforced with metal, glass fiber, and carbon fiber were developed, and the effects of the reinforcing materials on the mechanical properties of cork composites were investigated. The bending moduli of elasticity (MOE) of cork composites were in the 32.7-35.9 MPa range, while the bending strength values were in the 1.62-1.73 MPa range. The strength performance decreased in the order cork-metal > cork-carbon fiber > cork-glass fiber. The bending MOEs were improved by 29%-41% compared with simple cork boards, while the bending strengths of reinforced cork were 35%-45% higher. The strength performance significantly improved following the incorporation of thin mesh materials into the middle layer of the studied cork composites. The bending strains of the cork composites were remarkably higher compared with oak wood, making them promising for applications that require bending processing, such as curved jointing. The internal bond strengths of the cork composites were 0.26-0.44 MPa, approximately 0.36-0.60 times lower compared with medium-density fiber boards.

A study on the fiber orientation and mechanical characteristics of injection molded fiber-reinforced plastic for the rigidity improvement of automotive parts (자동차 부품의 강성 보강을 위한 섬유강화 플라스틱 사출성형품의 섬유 배향 및 기계적 특성에 관한 연구)

  • Eui-Chul Jeong;Yong-Dae Kim;Jeong-Won Lee;Seok-Kwan Hong;Sung-Hee Lee
    • Design & Manufacturing
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    • v.16 no.4
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    • pp.24-33
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    • 2022
  • Fiber-reinforced plastics(FRPs) have excellent specific stiffness and strength, so they are usually used as automotive parts that require high rigidity and lightweight instead of metal. However, it is difficult to predict the mechanical properties of injection molded parts due to the fiber orientation and breakage of FRPs. In this paper, the fiber orientation characteristics and mechanical properties of injection molded specimens were evaluated in order to fabricate automotive transmission side covers with FRPs and design a rib structure for improvement of their rigidity. The test molds were designed and manufactured to confirm the fiber orientation characteristics of each position of the injection molded standard plate-shaped specimens, and the tensile properties of the specimens were evaluated according to the injection molding conditions and directions of specimens. A gusset-rib structure was designed to improve the additional structural rigidity of the target products, and a proper rib structure was selected through the flexural tests of the rib-structured specimens. Based on the evaluation of fiber orientation and mechanical characteristics, the optimization analyses of gate location were performed to minimize the warpage of target products. Also, the deformation analyses against the internal pressure of target product were performed to confirm the rigidity improvement by gusset-rib structure. As a result, it could be confirmed that the deformation was reduced by 27~37% compared to the previous model, when the gusset-rib structure was applied to the joining part of the target products.