한국산학기술학회논문지 (Journal of the Korea Academia-Industrial cooperation Society)

  • 제11권4호
  • /
  • Pages.1178-1185
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  • 2010
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  • 1975-4701(pISSN)
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  • 2288-4688(eISSN)
한국산학기술학회 (The Korea Academia-Industrial cooperation Society)
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컨테이너 철도차륜의 안전성 평가에 관한 연구

A Study on Safety Estimation of Railroad Wheel

  • Lee, Dong-Woo (Department of Mechanical Engineering, Dong-A University) ;
  • Kim, Jin-Nam (Department of Mechanical Engineering, Kangwon National University) ;
  • Cho, Seok-Swoo (Department of Vehicle Engineering, Kangwon National University)
  • 투고 : 2010.01.21
  • 심사 : 2010.04.09
  • 발행 : 2010.04.30
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초록

철도차량의 고속화가 가속화되면서 화물을 운송하던 컨테이너 차량이 차륜의 파손에 의하여 탈선하는 사고가 발생하여 많은 물적 피해가 발생하고 있으며, 이러한 철도차량의 사고는 많은 인명 피해와 물적 피해를 가져오는 대형 사고로 발전할 수 있다. 따라서 이에 대한 재발 방지를 위한 차륜의 파손 해석에 대한 연구가 필요한 실정이다. 철도차량의 차륜은 기계적 하중과 열하중를 동시에 받으며, 기계적 하중으로는 철도차량의 무게에 의한 수직하중과 곡선 구간을 운행할 때 차륜과 레일의 접촉부에 수평하중이 발생하며, 철도차량의 제동시 답면제동에 의한 반복적인 열하중을 받는다. 이러한 차륜에 발생하는 기계적 하중과 열하중은 차륜의 균열과 잔류응력 등을 발생시키는 것으로 알려져 있다. 따라서, 본 연구에서는 차량 주행 시의 브레이크 이력과 하중 조건을 고려한 열 구조 연성해석을 수행하여 차륜에 부하되는 최대응력을 추정하였으며, 이 값을 파괴역학 파라미터인 응력확대계수에 적용하여 차륜의 안전성을 평가하였다.

Recently, high speed of container freight cars is causing fatigue damage of wheel. Sudden failure accidents cause a lot of physical and human damages. Therefore, damage analysis for wheel prevents failure accident of container freight car. Wheel receives mechanical and thermal loads at the same time while rolling stocks are run. The mechanical loads applied to wheel are classified by the horizontal load from contact of wheel and rail in curve line section and by the vertical force from rolling stocks weight. Also, braking and deceleration of rolling stocks cause repeated thermal load by wheel tread braking. Specially, braking of rolling stocks is frictional braking method that brake shoe is contacted in wheel tread by high breaking pressure. Frictional heat energy occurs on the contact surface between wheel tread and brake shoe. This braking converts kinetic energy of rolling stocks into heat energy by friction. This raises temperature rapidly and generates thermal loads in wheel and brake shoe. There mechanical and thermal loads generate crack and residual stress in wheel. Wetenkamp estimated temperature distribution of brake shoe experimentally. Donzella proposed fatigue life using thermal stress and residual stress. However, the load applied to wheel in aforementioned most researches considered thermal load and mechanical vertical load. Exact horizontal load is not considered as the load applied to wheel. Therefore, above-mentioned loading methods could not be applied to estimate actual stress applied to wheel. Therefore, this study proposed safety estimation on wheel of freight car using heat-structural coupled analysis on the basis of loading condition and stress intensity factor.

키워드

참고문헌

  1. Jae Ung Cho, "Statistical Fracture Analysis of Turbine Blade", J. of KAIS, Vol.7, No.2, pp.101-106, 2006.
  2. Byung Kab Koh and Sung Chul Lee, "An Experimental and Numerical Study on the Fracture Behavior of Air Conditioner Impellers", J. of KAIS, Vol. 10, No. 12, pp.3533-3539, 2009. https://doi.org/10.5762/KAIS.2009.10.12.3533
  3. Gordon J. and Perlman A., "Estimation of Residual Stresses in Railroad Commuter Car Wheels Following Manufacture", ASME IMECE RTD, 1998.
  4. Jung Won Seo, Byeong Choon Goo, Jae Boong Choi and Young-Jin Kim, "A Study on the Contact Fatigue Life Evaluation for Railway Wheels Considering Residual Stress Variation", J. of KSME, Vol. 28, No. 9, pp.1391-1398, 2004. https://doi.org/10.3795/KSME-A.2004.28.9.1391
  5. Wetenkamp, H. R., "The Influence of Brake shoes on the Temperatures of Wheels in Railway Service", J. of Engineering for Industry, pp.32-36, 1980.
  6. Jung Won Seo, Byeung Choon Goo and Heung Chai Chung, "Evaluation of Residual Stress of Railway Wheel", Spring Conference of Korean Society for Railway, Vol. 3, No. 1, pp.668-673, 2003.
  7. Donzella G. and Scepi. M., "The Effect of Block Braking on the Residual Stress State of a Solid Railway Wheel", IMechE, pp.145-158, 1998.
  8. ROTECO, Report of Braking Pressure Testing, 2003.
  9. Kyung Jin Choi, Chan Woo Lee and Si Woo Lee, "Effect on coefficient of brake and distribution of temperature on the braking of recycling", Spring Conference of Korean Society for Railway, Vol. 1, No. 6, p.209, 2006.
  10. K. Idemura, "Brake Technology of Railway Vehicle", Research of Machine, Vol.49, pp.49-68, 1997.
  11. AAR S-660-83, Procedure for the analytical evaluation of locomotive and freight car wheel designs. Manual of standards and recommended practices, Mechanical Division, American association of rail standards, USA, G57, 1983.
  12. 철도용품 공사규격서[합성제륜자] KRCS B244 01,2006.
  13. Young Sam Ham and Taek Yul Oh, "Stress Distribution of Tilting Vehicles wheel-set by Interaction Force Between Wheel and Rail", Proceedings of the KSPE 2006 Spring Annual Meeting, pp.351-352, 2006.
  14. Schiliern, Calculation of Wheel and Axle Set, Internal report of Integral Coach Factory, NO. SWS 504860 E, 1951.
  15. Fermer M., "Optimization of railway freight car wheel by use of fractional factorial design method", Proceedings of the Institute of Mechanical engineers, Vol. 208, p.97, 1994.
  16. Newman Jr, J.C. & Raju, I.S., Stress intensity factor equations for cracks in three-dimensional finite bodies, NASA Technical Memorandom 83200, p.1, 1981.
  17. Tanaka, K., "Mechanics and Micro- mechanics of Fatigue Crack Propagation", ASTM STP 1020, American society for Testing and Materials, Philadelphia, pp.151-183, 1989.