• Title/Summary/Keyword: cover plate

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Fracture Behavior of Plate Shape Ceramic using Compressive Shock Wave (압축 충격파를 이용한 평판형상 세라믹의 파괴거동)

  • Hwang, Kwon-Tae;Kim, Jae-Hoon;Lee, Young-Shin;Park, Jong-Ho;Song, Kee-Hyuck;Yoon, Soo-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.05a
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    • pp.103-106
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    • 2009
  • Fracture characteristics of plate shape using shock tube for glass filled ceramics was carried out. Glass filled ceramics have been considered as a promising candidate material for the dome port cover of air breathing engine. This part of the air breathing engine has an important role separating solid and liquid fuel, and needs the frangible characteristics that the fracture of a part should not affect the internal components of combustion. The objectives of this study are to evaluate the fracture pressures for various thicknesses and diameters of shock impact area. Also fracture phenomena of separated membrane using a shock tube are observed. The experimental apparatus of shock tube consists of a driver, a driven section and a dump tank. The used material is glass filled ceramic made from Corning company. Specimens are used 3, 4.5 and 6mm thickness. Also diameters of shock wave area are chosen 70, 60 and 50 mm. It is expected that the results obtained from this study can be used in the basic data for the dome port cover design of an air breathing engine.

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An Experimental Study on Behavior of Field Splice Joints of Longitudinal Rib in Orthotropic Steel Decks (강상판 종리브 현장연결부의 실험적 거동 특성)

  • Choi, Dong Ho;Choi, Hang Yong
    • Journal of Korean Society of Steel Construction
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    • v.13 no.6
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    • pp.621-629
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    • 2001
  • This study consists of static and fatigue tests to evaluate the behavior on the field splice joint of longitudinal rib in orthotropic steel deck specimens. Specifically, static and influence surface tests are performed for the stress distribution at the scallop area and high-strength bolt connection of longitudinal rib to examine the existence of handhole cover plate and the effect of eccentric loads. The ultimate strength of the field splice joint of longitudinal rib is obtained. In fatigue tests, cracks are observed at the scallop in the lower level test and the catastrophic failure of longitudinal rib is occurred following the failure of handhole cover plate in the higher level test. This study gives a basis for the better understanding of the field splice joint of longitudinal rib.

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The Seismic Behavior of Corrugated Steel Plate Lining in Cut-and-Cover Tunnel (개착식 터널에서 파형강판 라이닝의 동적 거동 특성)

  • Kim Jung-Ho;Kim Nag-Young;Lee Yong-Jun;Lee Seung-Ho;Chung Hyung-Sik
    • 한국터널공학회:학술대회논문집
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    • 2005.04a
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    • pp.233-247
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    • 2005
  • Most tunnel lining material which has been used in the domestic is a concrete. But many problems as the construction period, the cost, and the crack occurrence for the design, construction, and management were happened in the concrete lining. For this reason, many research institutes like the Korea Highway Corporation recognize the necessity of an alternate material development and grow on the interest for that. So in this study, the seismic behaviour characteristics for the application of the Corrugated Steel Plate Lining in cut-and-cover tunnel are evaluated as several conditions for the backfill height, the cutting slope, and the relative density of backfill soil are changed. The compressive stress which is calculated in the Corrugated Steel Plate Lining by the seismic load is decreased as the backfill height increases and the cut slope grows gentle. Also, the moment shows the tendency of decrease according to the increase of the backfill height. But in the case of the relative density of the backfill soil is small, the moment increases according to the increase of the backfill height and affects the dynamic behaviour characteristic. So it is considered that the relative density of the backfill soil is also the important point. As the result in analyzing the seismic response characteristics of the reinforcement spacing of the Corrugated Steel Plate, the variation in the compressive force is hardly happened, but the moment and the shear force increase on the reinforcement spacing being narrow.

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Three-Dimensional Contact Stress Analysis for Structural Design of Bolted Joint Assembly of Pressure Vessels in Nuclear Power Plants (원자력 발전소용 압력용기의 볼트 연결 조립부 구조설계를 위한 3차원 접촉 응력 해석)

  • Lee, Boo-Youn;Kim, Tae-Woan
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.4 s.97
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    • pp.122-128
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    • 1999
  • Bolted joint assembly for nuclear power plants consists of various components : cover plate, retainer plate, manway flange, gasket and stud bolts/nuts. To guarantee the soundness of the joint, it is important to prevent leakage through the gasket and reduce the stress concentration factor at the thread root. In this paper, Submodeling technique for the finite element method is proposed to accurately compute three dimensional contact stresses which govern the sealing performance and the maximum contact stresses at the threads root. For verification of global solutions used as boundary conditions of submodel solution, the stresses on the cover plate and the manway flange are measured by strain gages when internal pressure is applied to the bolted joint assembly. The numerical results are compared with the experimental results.

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Performance Tests on Parallel Plate Type Solar Air Heater (공기식 평행판형 태양집열기 성능실험)

  • Cha Jong Hee;Song Hi Yul
    • The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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    • v.6 no.4
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    • pp.255-261
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    • 1977
  • This study was concerned with the performance of solar air heater using parallel channels. Heat transmission model was developed and fabricated to increase the economic feasibility for solar heating system by using the cheap zinc plate. The prformance was discussed as a function of mass flow rate, and plate, inlet and outlet temperatures. Experimental results show that heat transmission model is sufficient for the analysis of thermal characteristics of air heater and collection efficiency is better than the domestic water heater, as the range 32-49 percent. Collection efficiency in the 2 layers of glass cover is better than that in 1 layer, so it is considered better to use the 2 layers of glass cover during the cold winter season in Korea.

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A Experimental Study on Bending Behaviors of Prestressed Hot-rolled H-Beam (프리스트레스된 압연강재보(H-BEAM)의 휨 거동에 대한 실험적 연구)

  • Yhim, Sung Soon;Jeong, Chan Haek
    • Journal of Korean Society of Steel Construction
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    • v.18 no.2
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    • pp.239-250
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    • 2006
  • In this study, the experimental bending behaviors of an H-secti on-steel-beam-attached high-strength steel plate or steel beam were analyzed. Its structural performance was verified by comparing the results of the experiment and the analysis that were conducted. In fabricating an unprestressed composite beam using two members that have different strengths, the generated slip on the joint in proport problem because of the redistribution of force caused by the lose state of the joint. Therefore, when fabricating composite beams, it is important to load them with prestressed forces. Based on the results of the experiment that was conducted, the prestressed composite-steel-beam-attached steel plate or beam has a higher bending resistance and load-carrying capacit

Evaluation of Analysis Code of Corrugated Steel Plate Lining in Cut-and-Cover Tunnel (개착식 터널에서 파형강판 라이닝의 해석 기법 평가)

  • Kim, Jung-Ho;Kim, Nak-Young;Lee, Yong-Jun;Lee, Seung-Ho;Hwang, Young-Chul;Cho, Chul-Shin;Chung, Hyung-Sik
    • Proceedings of the Korean Geotechical Society Conference
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    • 2005.03a
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    • pp.1316-1323
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    • 2005
  • Most tunnel lining material which has been used in the domestic is a concrete. But many problems as the construction period, the cost, and the crack occurrence for the design, construction, and management were happened in the concrete lining. For this reason, many research institutes like the Korea Highway Corporation recognize the necessity of an alternate material development and grow on the interest for that. So in this study, the behaviour characteristics for the application of the Corrugated Steel Plate Lining in cut-and-cover tunnel are evaluated as several conditions for the backfill height, the cutting slope, and the relative density of backfill soil are changed. In addition, through using that conditions, CHBDC(2000, Canadian Highway Bridge Design Code) is evaluated if it could be applied to the design by comparing with the numerical analysis results. As the behaviour characteristics of the Corrugated Steel Plate Lining by CHBDC and the static numerical analysis are analyzed, both the methods show the same linear increases of the compressive stress according to the increase of the backfill height. The CHBDC of the dead load condition has very similar tendency by comparing with the result of the static numerical analysis.

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Rational designing of double-sided nail plate joints using the finite element method

  • Zhou, Tinozivashe;Guan, Z.W.
    • Structural Engineering and Mechanics
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    • v.28 no.2
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    • pp.239-257
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    • 2008
  • Double-sided punched metal plate timber fasteners present projections on both sides, which offer improved joint fire resistance and better joint aesthetics. In this paper, 3-D nonlinear finite element models were developed to simulate double-sided nail plate fastener timber joints. The models, incorporating orthotropic elasticity, Hill's yield criterion and elasto-plasticity and contact algorithms, are capable of simulating complex contact between the tooth and the timber and between the base plate and the timber in a fastener. Using validated models, parametric studies of the double-sided nail plate joints was undertaken to cover the tooth length and the tooth width. Optimal configuration was assumed to have been attained when increase in nail plate tooth width did not result in a raise in joint capacity, in conjunction with the optimum tooth length. This paper presents the first attempt to model and optimise tooth profile of double-sided nail plate fastener timber joints, which offers rational designs of such fasteners.

Fatigue Characteristics according to the Shape of Cover Plate in Steel Plate Girders (강판형의 덮개판 형상에 따른 피로특성)

  • Jung, Young Hwa;Hong, Sung Wook;Kim, Ik Gyeom;Jung, Jin Suck
    • Journal of Korean Society of Steel Construction
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    • v.12 no.2 s.45
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    • pp.111-122
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    • 2000
  • In this study, A series of fatigue tests have been performed on the fillet welded joints of cover plates in steel plate girders in order to quantitatively assess the fatigue characteristics according to the shapes of cover plates. From the results of fatigue tests, it has been shown that the fatigue strengths were slightly different according to their shapes, but satisfied the fatigue design curves in Korea and other countries. Also, from the results of beachmark tests, it has been confirmed that the points of fatigue crack initiation were closely related to the shapes of weld bead toes, and fatigue cracks simultaneously initiated from several points in weld bead toes have been grown as semi-elliptical surface cracks, and these cracks have been coalesced each other, and grown as through thickness cracks, and finally reached to fracture. Besides, from the results of fracture mechanics approaches, stress gradient factors were the most dominant factors among crack correction factors obtained from the existing equations and finite element analysis, and the fatigue life on fillet welded joints of cover plates could be estimated using the relations between fatigue crack growth rate and stress intensity factor range obtained from finite element analysis.

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Optimum Design of Underwater Connector Hole Arrangement for Deep-sea Pressure Vessel Cover Plate (심해 압력용기 덮개판의 수중 커넥터홀 배치 최적설계)

  • Lee, Minuk;Park, Soung-Jea;Yeu, Tae-Kyeong;Ki, Hyong-Woo;Hong, Sup;Cho, Su-Gil;Jang, Jun-Yong;Lee, Tae Hee;Choi, Jong-Su
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.12
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    • pp.1627-1633
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    • 2012
  • A deep-sea pressure vessel needs to protect the internal electrical equipment from the high external pressure. Thus, the pressure vessel should be designed to be watertight and structurally safe. In this study, a cylindrical-type pressure vessel comprising a hollow cylinder and cover plates at both ends is investigated. For communication between the internal electronic equipment and the external device, holes are bored on the cover plate to install underwater connectors. Considering the type of internal equipment and underwater connector specifications, multiple holes may be required. These holes can affect the structural safety of the pressure vessel cover plate. In this study, the optimum design of the hole arrangement in consideration of the structural safety of the cover plate was performed.