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한석영,송시엽,Han, Seok-Yeong,Song, Si-Yeop 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
Most of mechanical failures are caused by repeated loadings and therefore they are strongly related to fatigue. To avoid the failures caused by fatigue, determination of an optimal shape of a structure is one of the very important factors in the initial design stage. Shape optimization fer two types of specimens, which are very typical ones in opening mode in fracture mechanics, was accomplished by the linear elastic fracture mechanics and the growth-strain method in this study. Also shape optimization for a cantilever beam in mixed mode was carried out by the same techniques. The linear elastic fracture mechanics was used to estimate stress intensity factors and fatigue lives. And the growth-strain method was used to optimize the shape of the initial shape of the specimens. From the results of the shape optimization, it was found that shapes of two types of specimens and a cantilever beam optimized by the growth-strain method prolong their fatigue lives significantly. Therefore, it was verified that the growth-strain method is an appropriate technique for shape optimization of a structure having a crack.
조우강(Cho Woo-Kang),한성욱(Han Sung-Wook),송시엽(Song Si-Yeop),박근수(Park Guen-Soo),박형순(Park Hyung-Soon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
A bogie frame is typical safty part of railway vehicle. Main performance of a bogie frame is to support a car body and passenger weight and transfer traction and braking force. This paper is to evaluate the static strength and fatigue strength for the end trailer bogie with UIC 615-4 code. Therefore stress analysis of the end trailer bogie frame has been performed for various loading condition according to the UIC 615-4 code and haigh diagram is used for evaluation of fatigue strength. By the results of these analysis, static and fatigue strength of the end trailer bogie is satisfied with a applied criterion.
한성욱(Han Sung-Wook),조우강(Cho Woo-Kang),김승섭(Sung-Sub Kim),박상구(Park Sang-Koo),송시엽(Song Si-Yeop),박형순(Park Hyung-Soon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
It is known that bogie frame must have sufficient stiffness for car body and passenger weight and transfer traction and braking force, and as of today most studies and verifications are restricted to static and fatigue analysis for force acted on bogie frame. Bogie frame is mounted with equipments to control the signal, traction and so on, this equipment"s behavior is subjected to vibration mode occurs on running condition. If the resonance occurs on this equipment, the possibility of crack occurrence on bracket connected with equipment and bogie frame will be increased. In this paper, the method of vibration strength verification for bracket attached on bogie frame will be introduced by using frequency response method.