• Title/Summary/Keyword: axisymetric model

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An Experimental Analysis for Axisymetric Hot Extrusion Through Square Dies Using Visioplasticity Method (변형가시화법을 이용한 열간 축대칭 평금형 압출의 실험적 해석)

  • 엄태복;한철호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1995.03a
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    • pp.107-113
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    • 1995
  • To investigate the behavior of platic deformation inaxisymmetric hot extrusion through square dies, the physical modelling with the plasticine as a model material is carried out at the room temperature. Some mechanical properties of the model material are determined by compression and ring compression tests. Visioplasticity method using experimetal grid distortion is introduced to anlayze the plastic flow, strain rate and strain distribution.

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Numerical Analysis on the Reacting Flow-Field of Coaxial Combustor with a Wedge-Shaped Flame Holder (Wedge형 보염기를 장착한 동축형 연소기의 반응 유동장 수치해석)

  • Ko Hyun;Sung Hong-Gye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2005.11a
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    • pp.450-454
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    • 2005
  • A numerical analysis is performed to analyze the reacting flow-field of an axisymetric coaxial ramjet combustor. Two dimensional Navier-Stokes equation with low Reynolds number $k-\varepsilon$ turbulence model is utilized and finite-rate chemistry model is adopted. Eddy dissipation model is applied for a modeling of turbulent combustion. Two different types of combustors (combustor with a suddenly expanded dump and combustor with wedge-shaped flame holders) are compared in a view point of flame stabilizing.

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A Study on The Distribution of Surface Charge Density on Polymer Insulators (고분자애자의 표면전하밀도 분포에 관한 연구)

  • Yang, J.J.;Hwang, B.M.;Kim, K.S.;Lee, J.H.
    • Proceedings of the KIEE Conference
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    • 1997.11a
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    • pp.354-356
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    • 1997
  • In this paper, we study the distribution of surface charge density on polymer insulators. The electric field of polymer insulators is calculated by axisymetric 3-D FEM with dc source. And the surface charge density is calculated by electric scalar potential and boundary condition for electrostatic fields. Simulation model is the inclined type polymer insulator with a shed.

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The Strength Evaluation of TiNi/A16061 Composite by Using Finite Element Method (유한요소법을 이용한 TiNi/A16061 형상기억 복합재료의 강도평가)

  • Park, Yeong-Cheol;Lee, Gyu-Chang;Park, Dong-Seong;Lee, Dong-Hwa;Dong Hwa
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.2
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    • pp.72-78
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    • 2002
  • Thermomechanical behavior and mechanical properties of A16061 matrix composite with shape memory alloy(SMA) fiber are studied by using fnite element analysis(FEA). The smartness of the SMA is given due to the shape memory effect of the TiNi fiber which generates compressive residual stress in the matrix material when healed after being prestrained. In this paper, an analytical model is assumed two dimentional axisymetric model of one fiber and around the matrix. To evaluate the strength of composite usig FEM, the concept of smart composite was simulated on computer. The Shape memory effect(SME) simulation is very difficult using FEM because of the nonlinear analysis and the elastic plastic analysis. Thus, in this paper, the FEA was carried out at two critical temperature conditions; room temperature and high temperature(363K). The analysis is compare the finite element analysis result with the test result for the analysis validity.

A study on the stress distribution and nugget formation in resistance welding process using computer simulation (컴퓨터 시뮬레이션을 이용한 저항용접에 관한 연구)

  • 함원국
    • Journal of Welding and Joining
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    • v.9 no.3
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    • pp.41-51
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    • 1991
  • The thermomechanical coupling phenomena in the resistance welding process is complicated due to interactions of mechanical, thermal and electrical factors. Although experimental investigations of resistance spot welding have been carried out, but there are a few by computer simulation. so the purpose of this research is to decrease the time and cost much required in experimental investigation by carrying out the analysis of the resistance spot welding process through computer simulation based on the finite element method. The tool used in the computer simulation is the commercial ANSYS program package. A two dimensional axisymetric model is used to simulate the resistance spot welding for two stainless steel sheets of equal thickness and parametric study is carried out for variable welding current, workpieces of unequal thickness and dissimilar materials. The results from the computer simulation are in good agreement with the experimental one. Through these results, such items as stress distribution, temperature profiles, thermal expansion and weld nugget formation are predicted. Reliability and applicability of finite element models have been demonstrated to simulate and to analyze the resistance spot welding process.

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Evaluation on Mechanical Properties of a Smart Composite Using the finite Element Method and the Acoustic Emission Technique (FEM과 AE를 이용한 지적복합재료의 기계적특성 평가)

  • Park, Young-Chul;Lee, Jin-Kyung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.24 no.3
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    • pp.233-239
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    • 2004
  • Smart material is used in various applications such as for glass frame, for medical instruments and for a part of sensors. Smart composite materials ran be applied to a part of aircraft and to the on-line monitoring system for industrial structures, using the shape memory effect. However, it is very difficult to simulate and analyze the shape memory effect in smart composites. In this paper, a two dimensional axisymmetric model was proposed to analyze the smart composite of one fiber and matrix using the finite element method(FEM). The finite element analysis was carried out in two renditions of the room temperature(293K) and a higher temperature (363K). The results we.e compared with the experimental results to confirm the validity of the analysis. In addition, the acoustic emission(AE) technique was used to study the microscopic damage behavior and the effect of pre-strains on TiNi/A16061 shape memory alloy composite.