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정기현(Ki-Hyun Chung),양원호(Won-Ho Yang),고명훈(Myung-Hoon Ko),성기득(Ki-Deug Sung) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Many mechanical fastened methods have been proposed in order to retard crack initiation and to improve fatigue life. In order to the crack which occurs under the cold expansion residual stress, it necessary the stress intensity factor analysis required. From this analysis, it is possible to estimate the stability of fracture mechanical behavior and fatigue life of the fastened structures. The fatigue crack growth tests were performed for the CT(compact tension) specimen in which the residual stress by cold expansion had been generated. The cold expansion method delays the crack initiation, but hasten the crack growth propagating from the hole. The crack growth rate increases due to the increase in the cold expansion ratio. da/dN- ΔK curves arc slightly different corresponding to the cold expansion ratio, but the curves me included within un agreeable band.
차량 롤오버 성능 해석을 통한 설계변수 민감도 분석에 관한 연군
권성진(Seong-Jin Kwon),배철용(Chul-Yong Bae),김찬중(Chan-Jung Kim),이봉현(Bong-Hyun Lee),구태윤(Tae-Yun Koo),성기득(Ki-Deug Sung) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Rollover is defined as a vehicle rotation of 90 degree or more around its longitudinal axis. Understanding the effects of vehicle and tire properties on the rollover propensity is an essential research. In this paper, the sensitivity analysis of vehicle and tire design variables has been investigated by vehicle rollover analysis, which contains multi-body vehicle dynamic models and nonlinear tire models. For the purpose, the several orthogonal arrays based on the DOE (Design of Experiments) analysis has been constructed, and main effects and percent effects of each vehicle and tire design variable has been discussed on diverse rollover characteristics.
유한요소법을 이용한 레일의 헤드에 존재하는 균열의 응력확대계수에 관한 연구
인경환,성기득,김종욱,조명래,양원호 成均館大學校 科學技術硏究所 1999 論文集 Vol.50 No.1
In recent years, the rolling stock is being increasingly developed. However, higher axle loads have increased the incidence of fatigue defects in railroad rails. Many of these fatigue-initiated defects develop in the head of the rail. The head defects are very important because they are generally not visible until they reach quite large size and they can lead to catastrophic rail fractures. In this paper, stress intensity factors(SIF) of a embedded crack in the head of the rail were analysed along the wheel positions relative to the crack plane and along the running condition using the finite element method.