• Title/Summary/Keyword: Punching Analysis

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An Experimental Study on the Analysis of Behavior Characteristics of the NDB Soil Nailing System (NDB 쏘일네일링 시스템의 거동특성 평가에 관한 실험적 고찰)

  • 김홍택;정성필;박시삼;전경식
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.521-528
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    • 2003
  • In this study, a newly modified soil nailing technology called as the NDB(New Down and Board) soil nailing system is introduced. To improve the trafficability, workability, and economical efficiency, SMC(Sheet Molding Compound) board is adopted instead of using the concrete block facing. The SMC board has a distinct advantage of showing a fine view by directly coating with any kind of environmental photos. Composite material properties of the SMC board and cement grout are distinguished features of the NDB soil nailing system. In the present study, both laboratory tests(bending and punching failure tests) and field pull-out tests are carried out to analyze the behavior characteristics of the NDB soil nailing system, including the stress and strain distribution.

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Analysis of Electromagnetic Vibration Sources in 100kW Interior Permanent Magnet Motor for Ship Anti-heeling Pump Considering Eccentricity (선박 자세안정성 향상을 위한 Anti-heeling Pump용 100kW급 IPM 전동기의 편심에 의한 전자기 가진력 분석)

  • Lee, Sun-Kwon;Kang, Gyu-Hong;Hur, Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.12
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    • pp.2230-2235
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    • 2011
  • The purpose of this paper is to provide the unbalanced magnetic force and vibration mode comparison between two large interior permanent magnet machines(IPM) with different pole-slot combination considering stator and rotor eccentricity. Due to the punching tolerance, the mixed eccentricity of air-gap is inevitable. It will generate the asymmetric magnetic flux density in air-gap, which makes the unbalanced magnetic pull and vibration. The study is focused on the unbalanced magnetic force and their harmonic components according to eccentricity conditions such as static, dynamic and mixed. When the high vibration is produced especially resonance, the obtained results provide clues what eccentricity condition occurs in the machine.

Existing RC deck and Simplified Composite Deck Comparative Analysis Of Punching Shear Strength (기존 RC 바닥판과 초간편 강합성 바닥판의 펀칭전단강도에 대한 비교 분석)

  • Lee, Sung-Yul;Yoon, Ki-Ying;Yi, Gyu-Sei;Kim, Sang-Seup
    • Proceedings of the KAIS Fall Conference
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    • 2009.12a
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    • pp.33-36
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    • 2009
  • 현행 도로교설계기준의 바닥판에 대한 설계방법은 휨 이론에 따라 바닥판을 단위 폭의 보로 보고 강도설계법으로 설계하고 있다. 그러나 실제 교량 바닥판의 파괴 형태는 펀칭에 의한 파괴이므로 바닥판의 극한성능은 펀칭전단강도를 토대로 평가해야 할 것이다. 하지만 기존에 연구된 결과로는 초간편 강합성 바닥판의 펀칭전단강도를 산정하기 어려워 이에 대한 연구가 필요한 실정이다. 본 연구에서는 개발된 초간편 강합성 바닥판의 펀칭전단성능을 파악하기 위하여 초간편 강합성 바닥판과 RC바닥판에 대한 펀칭전단실험을 실시하여 비교하여 보았다.

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A Comparative Analysis between 2D and 3D Modeling in the Piercing Process of Lead Frame and Experimental Study (리드프레임 피어싱 공정의 2D와 3D 모델링 비교해석 및 실험적 연구)

  • Bang, H.J.;Han, S.S.;Han, C.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2006.05a
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    • pp.288-291
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    • 2006
  • Piercing or blanking process is widely used to manufacture most of lead frame parts, but it is difficult to analyze the real process by the actual shape through progressive dies. In this paper several stages in progressive punching are modeled by 2D and 3D configurations using $DEFORM^{TM}$ 2D/ 3D code. During the progressive stage some state variables and deformed configurations are analyzed in each model. There are three stages in the process, the deformations at each stage are cumulative. The advantages and disadvantages of these two type modeling are discussed and analyzed. The experiments are performed as a working material copper alloy through manufactured die. Computed results in load by two types are compared to experiments.

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Optimize Design for 5MW Offshore Wind Turbine Sub-structure Jack-up Platform (5MW급 해상풍력 Sub-structure Jack-up Platform 최적화 설계)

  • Jeon, Jung-Do;Jeon, Eon-Chan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.6
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    • pp.115-122
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    • 2012
  • The purpose of this study is to optimize the design of the jack-up platform for 5MW offshore wind turbine system. Considering all the environmental loads such as currents, waves, winds and so on, the members of structures have been designed and optimized based on the AISC and API-RP-2A to be within the allowable stress even in the most critical and severe condition. In addition to the above strength check of structural members, the joint punching shear check and the hydrostatic collapse check are also performed where they are required for the design. The design life of the jack-up platform is 50 years for the static strength check and the fatigue design life is 100 years including to the DFF(Design Fatigue Factor) of 2.0 to have enough stability and workability for the design optimization.

Development of Micro Metal Forming Manufacturing System (초미세 마이크로 소성성형 가공시스템 기술 개발)

  • Lee Nak-Kyu;Choi Tae-Hoon;Lee Hye-Jin;Chi Seog-Ou;Park Hoon-Jae;La Won-Ki
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2005.05a
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    • pp.383-388
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    • 2005
  • In this paper Research development about a micro metal forming manufacturing system has been developed. A micro forming system has been achieved in Japan and it's developed micro press is limited to single forming process. To coincide with the purpose to be more practical, research and development is necessary about the press which the multi forming process is possible. We set the development of the equipment including micro deep drawing, micro punching and micro restriking process to the goal. To achieve this goal, Research about micro forming process to be related to multi process forming must be preceded first. Material selection and analysis about micro forming process are accomplished in this paper. And the basis research to make actual system is accomplished.

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Heating Properties of Conductive Resistor by Induction Heating (유도가열에 의한 도전성 저항체의 승온특성)

  • Han, Chang-Woo;Ahn, Jae-Cheol;Oh, Sang-Gyun;Kang, Byeung-Hee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.39-40
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    • 2011
  • The purpose of this study is to select a conductive resistor as high energy efficiency through analysis of the heating properties by induction heating. The result of this study, the heating properties is capable of weaken cementitious joint in 10~30 seconds when using the conductive resistor with wire mesh or punching metal. Although the steel is higher temperature than SUS304, SUS304's heating properties are more uniform.

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Heating Properties and Pore structure of Cementitious Joint by Induction Heating (시멘트계 접합부의 유도가열에 의한 승온특성 및 공극구조)

  • Kang, Dong-Woo;Ahn, Jae-Cheol;Kim, Jung-Kil;Kang, Byeung-Hee
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2011.05a
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    • pp.3-4
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    • 2011
  • The purpose of this study is to suggest basic data for development optimal disassembly manufacturing system during analysis pore structure and heating properties of cementitious joint using conductive resister by induction heating. From the results, we knew cementitious joint is weak easily by heating of conductive resister, such as wire mesh, punching metal, and steel fiber, from induction heating.

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EFFECTS OF FORMING PROCESS ON SEALING PERFORMANCE OF FULL-BEAD OF MLS GASKET: FINITE ELEMENT ANALYSIS APPROACH

  • CHO S.-S.;HAN B. K.;CHANG H.;KIM B. K.
    • International Journal of Automotive Technology
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    • v.6 no.2
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    • pp.191-196
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    • 2005
  • A full-bead of multi-layer-steel (MLS) engine head gasket is used to seal the combustion gas. Finite element analyses were conducted to assess the dependence of the sealing performance of full-bead on the forming process consisting of embossing and flatting operations. It is demonstrated that the sealing performance is enhanced with more severe deformation of the bead plate during the embossing, i.e., with the increase in the punching depth, the punch height, the punch width and the friction coefficient of the bead plate against the punch and die, and with the decrease in the width of die cavity. Meanwhile, the flatting process that is employed to adjust the height of the embossed full-bead has no influence on the sealing performance.

Fatigue Strength Evaluation of the Clinch Joints of a Cold Rolled Steel Sheet

  • Kim, Ho-Kyung
    • International Journal of Railway
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    • v.2 no.4
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    • pp.131-138
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    • 2009
  • Static tensile and fatigue tests were conducted using tensile-shear specimens to evaluate the fatigue strength of a SPCC sheet clinch joint. The maximum tensile strength of the specimen produced at the optimal punching force was 1750 kN. The fatigue endurance limit (=760 N) approached 43% of the maximum tensile load (=1750 N) at a load ratio of 0.1, suggesting that the fatigue limit is approximately half of the value of the maximum tensile strength. The FEM analysis showed that at the fatigue endurance limit, the maximum von-Mises stress of 373 MPa is very close to the ultimate tensile strength of the SPCC sheet (=382 MPa).

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