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서정원(Seo Jung-Won),구병춘(Goo Byeung-Choon),이동형(Lee Dong-Hyeong),정흥채(Chung Heung-Chai) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway wheel and axle are 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 evaluation of wheel set strength and safety has been desired. Damages of railway wheel are a spalling by wheel/rail contact and thermal crack by braking heat etc. One of the main source of damage is a residual stress, therefore it is important to evaluate exactly. A Residual stress of wheel is formed at the process of heat treatment when manufacturing. it is changed by contact stress developed by wheel/rail contact and thermal stress from heat induced in braking. The objective of this paper is to estimate the variation and magnitude of the residual stress of railway wheel.
기계적인 하중에 의한 용접부 잔류응력의 이완에 관한 해석
서정원(Seo Jung-Won),구병춘(Goo Byeung-Choon),이동형(Lee Dong-Hyeong),정흥채(Chung Heung-Chai) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Welding residual stresses are the main topics of welding research fields. The residual stresses and distortion of structures by welding exert negative effect on the safety of mechanical structures. That is, expansion of material by high temperature and distortion by cooling during welding process are caused by tensile and compressive residual stresses in welding material, and this residual stresses can induce fracture and fatigue problems of welding structures. The accurate prediction of residual stress and relaxation due to mechanical loading of weld zone is very important to improve the quality of weldment. In this study, a finite element modeling technique is developed to simulate the relaxation of residual stresses due to mechanical loading. The effects of load ratio for static and cyclic loading are evaluated based on analytical results.