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현차시험에 의한 디젤기관차용 합성제륜자의 마모특성 연구
권석진(Kwon Seok-Jin),최경진(Choi Kyung-Jin),고광범(Ko Kang-Bum),이장희(Lee Jang-Hee) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, we investigated the wear rate, braking temperature and stopping distance of the composite brake shoe for diesel locomotive in the field test. The wear rate and braking temperature of the composite brake shoe would rather than cast iron. Also, the stopping distance of composite brake shoe is 450m at 100㎞/h. This result of field test shown that the density distribution of the composite brake shoe influence on wear rate.
철도차량 안전성을 위한 주행 차축의 비파괴 검사주기 평가
권석진(Seok Jin Kwon),이동형(Dong Hyung Lee),서정원(Jung Won Seo),김재철(Jae Chul Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.9
Usually, railway axles are designed for infinite life based on endurance limit of the material and the axle is not fractured immediately when a surface crack initiated. The railway axles have been inspected regularly by NDT such as ultrasonic testing, magnetic testing and eddy current testing and so on. Because the axle failure is profoundly influenced by the probability of missing a fatigue crack during an NDT inspection, it is necessary to evaluate the Non Destructive Interval of railway axle. In the present paper, the Non Destructive Interval of railway axle based on fracture mechanics and finite element analysis was investigated. It was shown that the Non Destructive Interval of railway axle can be evaluated using fracture mechanics approach and extended using NDT which a crack can detect clearly.
파손시나리오에 의한 차륜-레일의 파괴역학적 안전성 평가
권석진(Seok-Jin Kwon),이동형(Dong-Hyung Lee),서정원(Jung-Won Seo),구병춘(Byeung-Chun Goo) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Fracture mechanics approach can be severly hampered unless considerable detailed specific knowledge is available. The problem of railway wheel-rail system fatigue design is currently undertaken by using assumed conservative design procedures. However, although the failure rate is low, the consequences of any such failure can be far reaching. It has been demonstrated that the tools available for effective management have limits. In the present study, the safety evaluation based on fracture mechanics is carried out. The critical crack size and remaining lifetime are calculated on the wheel for high-speed train.
권석진(Seok Jin Kwon),서정원(Jung Won Seo),이동형(Dong Hyung Lee),함영삼(Young Sam Ham) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.8
Railway wheel and axle is the most critical components in railway system. A wheel and axle failure can cause a derailment with its attendant loss of life and property. The service conditions of railway vehicles have become severe in recent years due to a general increase in operating speeds. Therefore, more precise evaluate of wheelset strength and safety has been desired. Fracture mechanics characteristics such as dynamic fracture toughness, fatigue threshold and charpy impact energy with respect to the tread, plate, disc hole of wheel and the surface of press fitted axle are evaluated. This paper describes the difference of fracture toughness, fatigue crack growth and fatigue threshold at the locations of wheel and axle. The results show that the dynamic fracture toughness, K<SUB>ID</SUB>, is obviously lower than static fracture toughness, K<SUB>IC</SUB> and the fracture mechanics characteristics are difference to the location of wheel tread and hole.
권석진(Seok-Jin Kwon),서정원(Jung-Won Seo),이동형(Dong-Hyong Lee),김영규(Young-Kyu Kim),김재철(Jae-Chul Kim) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The thermo-mechanical interaction between brake block and wheel tread during braking has been found to cause thermal crack on the wheel tread. Due to thermal expansion of the rim material the thermal cracks will protrude from the wheel tread and be more exposed to wear during the wheel/block contact than the rest of the tread surface. The wheel rim is in residual compression stress when is new. After service running the region in the tread has reversed to tension. This condition can lead to the formation and growth of thermal cracks in the rim which can ultimately lead to premature failure of wheel. In the present paper the thermal cracks of railway wheel one of severe damages on the wheel tread were evaluated to understand the safety of railway wheel in running condition. The residual stresses for damaged wheel which are applied to tread brake are investigated. Mainly X-ray diffusion method is used. Under the condition of concurrent loading of continuous rolling contact with rails and cyclic frictional heat from brake blocks the reduction of residual stress is found to correlate well with the thermal crack initiation.