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복합 적층판의 접촉에 의한 변형 및 응력분포에 대한 해석
조종두(C.D.Cho),소인석(I.S.So) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
In this thesis, When Isotropic material and was loading by spherical indenter. stres distribution and deformation was investigated by the finite element method.<br/> As the semi-infinite body is given compressive loading, the body is governed by Hertz conta law. But if the Thickness is thin, The stress distribution and deformed degree of the body w be differ from Hertz law. Through study it is reveal that the body which is thick plate, same loading condition, has maximum compressive stress higher than the thick plate, and<br/> contact region is narrow, that is, the thin plate has wide contact region and maximum compressive stress decreases by bending and other effects. And the transition region is very narrow from thick plate characteristics to thin plate characteristics.<br/>
다물체 동역학 해석을 이용한 기계식 프레스의 구동토크 예측
조영빈(Y. B Cho),김창우(C. W. Kim),송경회(K. H. Song),정종섭(J. S. Jung),유현길(H. G. Yoo),조종두(C. Cho) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The mechanical type press machine is generally applied in various industries for forming materials such as sheet metal with plastic deformation by compressive force. This kind of press machine should be designed precisely, since driving parts and frames of the machine need to be able to endure considerable stress than other machine tools. It is especially necessary to calculate the accurate operating torque at the maximum compression that is required for designing the motor of the press machine. In this paper, operating torque of 2000-ton mechanical type press machine is studied by comparing result from kinematic equation and numerical analysis.
김동현(D.H.Kim),조종두(C.D.Cho) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
When dominated convective tenn applied to a convection diffusion heat transfer problems, finite elment analysis give poor accuracy in a high Pe(Peclet number). It is important to get a more accurate finite elemnet analysis result that we determine the critical value of Peclet number and measure Peclet number, which produces oscillated result. In this study, we expect temperature and stress distributions for various Pe by the 3 dimensional finite elemnet model and manifest the Peclet number when the oscillation occurs from the result under the convective heat transfer boundary conditions. In order to get the more accurate finite element analysis result, it is proposed the numerical technique that eliminating the oscilatory error components in the period of Pe that temperature distributions are not valid From the yielding criteria, we check the influence of resulting temperature and stress distributions on the materials<br/> <br/>
FDM 과 FEM 의 해석 데이터 변환에 의한 탄소성 열응력 해석
곽시영(S . Y . Kwahk),조종두(C . D . Cho) 한국열처리공학회 2001 熱處理工學會誌 Vol.14 No.4
N/A The present study was an attempt for systematic data conversion between FDM and FEM in order to evaluate the thermal stress distribution during quenching process. It has been generally recognized that FDM is efficient in flow and temperature analysis and FEM in that of stress. But it induced difficulty and tedious work in analysis that one uses both FDM and FEM to take their advantages because of the discrepancy of nodes between analysis tools. So we proposed field data conversion procedure from FDM to FEM in 3-dimensional space, then applied this procedure to analysis of quenching process. The simulation procedure calculates the distributions of temperature and microstructure using FDM and microstructure evolution equations of diffusion and diffusionless transformation. FEM was used for predicting the distributions of thermal stress. The present numerical code includes coupled temperaturephase transformation kinetics and temperature-microstructure dependent material properties. Calculated results were compared with previous experimental data to verify the method, which showed good agreements.