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철도차량용 휠과 레일의 접촉특성 해석 및 형상설계에 관한 연구 (2)
성기득,양원호,조명래,허성필,Seong, Gi-Deuk,Yang, Won-Ho,Jo, Myeong-Rae,Heo, Seong-Pil 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.5
One of the main causes of severe wear or crack initiation in wheel and rail is the contact stress due to wheel-rail contact. First, we obtain contact stress due to the rail mounting slope using the finite element method. Second, the shape design based on more reasonable contact stress analysis rather th~n a general Hertzian contact theory is investigated in order to reduce the contact stress. The optimum -design is performed using the simple 2-D finite element model and its results are verified by 311) finite element analysis.
경계요소법을 이용한 관통균열의 응력확대계수에 미치는 미소결함의 영향에 관한 연구
성기득,양원호,조명래,Seong, Gi-Deuk,Yang, Won-Ho,Jo, Myeong-Rae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.3
Many researchers have dealt with the problems of fracture mechanics. Generally, these researches are concerned with crack in isotropic material without other micro defects. Actual structure, however, may contain micro defects as well as crack in manufacture processing or operation. If it contains mi defects near a crack, some different characteristics will be appear in fracture behaviors of the crack. This study examines the effect of the micro defect on stress intensity factor of center slant crack rectangular plate subjected to uniform uniaxial tensile stress. In this study, boundary element method(BEM) is used for analysis in stress intensity factor(SIF).
성기득,양원호,조명래,허성필,Seong, Gi-Deuk,Yang, Won-Ho,Jo, Myeong-Rae,Heo, Seong-Pil 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.11
One of the main causes of severe wear or crack initiation in wheel and rail is the contact stress due to wheel-rail contact. In this paper, the shape design based on more reasonable contact stress analysis rather than a general Hertzian contact theory is investigated in order to reduce the contact stress. The optimal design is performed using the simple 2-D finite element model and its results are verified by 3-D finite element analysis.
FEM을 이용한 타이어의 벨트각도에 따른 PRAT 및 코너링 특성 연구
성기득(Ki Deug Sung),김성래(Seong Rae Kim),김기현(Ki Hyun Kim),김선주(Sun Joo Kim),조춘택(Choon Tack Cho) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.2
The influence of tire belt angle on the Plysteer Residual Aligning Torque(PRAT) and the cornering stiffness by the FEM has been studied. The PRAT is a performance factor of the tire about vehicle pull, and the cornering stiffness has relation to vehicle steering response of outdoor test. To validate FE model for analysis, simulation data for both the static stiffness(vertical, lateral) and the PRAT have been compared with the experimental data. In addition to the characteristics of the PRAT and the cornering stiffness due to the tire belt angle, rolling and cornering contact characteristics have been studied. The tendency of the PRAT and the cornering stiffness due to the belt angle can be used as a guide line for the tire design in relation to vehicle pull and vehicle steering response.