A Study on the Contact Fatigue Life Evaluation for Railway Wheels Considering Residual Stress Variation

2004 ◽  
Vol 28 (9) ◽  
pp. 1391-1398 ◽  
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Contact Fatigue ◽  
Stress Variation ◽  
Life Evaluation ◽  
Contact Fatigue Life ◽  
Fatigue Life Evaluation ◽  
Railway Wheels

The Effects of Residual Stress of Contact Fatigue Life for Railway Wheels

2005 ◽  
Vol 297-300 ◽  
pp. 115-121 ◽  
Author(s):  
Jung Won Seo ◽  
Byeong Choon Goo ◽  
Heung Chai Chung ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Fatigue Life ◽  
Contact Fatigue ◽  
Contact Load ◽  
Evaluation Procedure ◽  
Railway Wheel ◽  
Railway Vehicles ◽  
Contact Fatigue Life ◽  
Railway Wheels

Railway wheels and axles belong to the most critical components in railway vehicles. The service conditions of railway vehicles became more severe in recent years due to the increase of speed. Therefore, a more precise evaluation of railway wheel life and safety has been requested. Wheel/rail contact fatigue and thermal cracks due to braking are two major mechanisms of the railway wheel failure. One of the main sources of the contact zone failure is the residual stress. The residual stress on wheel is formed during the manufacturing process which includes a heat treatment, and then, is changed in the process of braking which results in wheel/rail contact stress and thermal stress. In this paper, an evaluation procedure for the contact fatigue life of railway wheel including residual stress is proposed. Also, the cyclic stress history for fatigue analysis is simulated by applying finite element analysis for the moving contact load. As a result, a fatigue life estimation methodology is proposed for railway wheels which includes the effects of residual stresses due to heat treatment, braking and repeated contact load, respectively.

The Effects of Residual Stress of Contact Fatigue Life for Railway Wheels

2005 ◽  
pp. 115-121
Author(s):  
Jung Won Seo ◽  
Byeong Chun Goo ◽  
Heung Chai Chung ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Contact Fatigue ◽  
Contact Fatigue Life ◽  
Railway Wheels

Rolling Contact Fatigue Life of 13Cr-2Ni-2Mo Stainless Steels which are Surface Treated by Induction Heating (IH) and Wide Peening Cleaning (WPC)

2018 ◽  
Vol 777 ◽  
pp. 366-371
Author(s):  
Takuto Yamada ◽  
Koshiro Mizobe ◽  
Katsuyuki Kida
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Induction Heating ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Life Evaluation ◽  
Contact Fatigue Life ◽  
Improve Fatigue Strength ◽  
Improve Fatigue

A new surface treatment, wide peening cleaning (WPC), was developed to improve fatigue strength of steels using shot peening and sandblast technologies. The combination of induction heating (IH) and WPC is expected to introduce higher compressive stress on the steels than single IH or single WPC. We investigated effect of IH and WPC on rolling contact fatigue life of 13Cr-2Ni-2Mo stainless steel. Vickers hardness and residual stress measurements, and RCF life evaluation using the Weibull distribution were carried out. It was found that the residual stress was introduced by WPC near the surface to improve life fatigue

The Contact Fatigue Life Evaluation According to Contact Surface Removal

2006 ◽  
pp. 640-643
Author(s):  
Jung Won Seo ◽  
Seok Jin Kwon ◽  
Hyun Mu Hur ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Fatigue Life ◽  
Contact Surface ◽  
Contact Fatigue ◽  
Life Evaluation ◽  
Contact Fatigue Life ◽  
Fatigue Life Evaluation ◽  
Surface Removal

Effects of Residual Stress and Traction Force on the Contact Fatigue Life of Railway Wheels

2006 ◽  
Vol 326-328 ◽  
pp. 1067-1070
Author(s):  
Jung Won Seo ◽  
Hyun Mu Hur ◽  
Sung Tae Kwon ◽  
Jae Boong Choi ◽  
Young Jin Kim
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Contact Fatigue ◽  
Traction Force ◽  
Railway Wheel ◽  
Traction Coefficient ◽  
Contact Fatigue Life ◽  
Railway Wheels ◽  
Effect Of Surface ◽  
Surface Removal

Damage often occurs on the surface of railway wheels due to wheel-rail contact fatigue. Since the wheel failure can cause derailment causing the loss of life and property, it should be removed prior to the wheel failure. The effect of surface removal on contact fatigue life has been investigated by many researchers, however, the effects of residual stress and traction force have not been reported yet. The railway wheel reserves the initial residual stress due to the manufacturing process, and this residual stress is changed by the thermal stress induced by braking. Also, the traction force is usually applied along with residual stress on wheels of locomotive and electric motor vehicle. In this study, the effect of surface removal on the contact fatigue life for a railway wheel has been evaluated by applying the rolling contact fatigue test. Also, the effect of traction force and change of residual stress on the contact fatigue life has been estimated by applying finite element analysis. It is found that the residual stress is a dominant factor determining the surface removal depth as far as the traction coefficient is less than 0.15. If the traction coefficient is greater than 0.2, however, the surface removal depth is observed to be independent on the residual stress.

Evaluation of contact fatigue life of a wind turbine carburized gear considering gradients of mechanical properties

2018 ◽  
Vol 28 (8) ◽  
pp. 1170-1190 ◽  
Author(s):  
Wei Wang ◽  
Huaiju Liu ◽  
Caichao Zhu ◽  
Zhangdong Sun
Keyword(s):  
Residual Stress ◽  
Fatigue Life ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Heavy Duty ◽  
Initial Residual Stress ◽  
Contact Fatigue Life ◽  
Carburized Gear ◽  
Load Conditions

Case hardening processes such as carburizing are extensively applied in heavy-duty gears used in wind turbines, ships, high-speed rails, etc. Contact fatigue failure occurs commonly in engineering practice, thus reduces reliabilities of those machines. Rolling contact fatigue life of a carburized gear is influenced by factors such as the gradients of mechanical properties and profile of initial residual stress. In this regard, the study of contact fatigue life of carburized gears should be conducted with the consideration of those aspects. In this study, a finite element elastic–plastic contact model of a carburized gear is developed which takes the gradients of hardness and initial residual stress into account. Initial residual stress distribution and the hardness profile along the depth are obtained through experimental measurements. The effect of the hardness gradient is reflected by the gradients of yield strength and fatigue parameters. The modified Fatemi–Socie strain-life criterion is used to estimate the rolling contact fatigue life of the heavy-duty carburized gear. Numerical results reveal that according to the Fatemi–Socie fatigue life criterion, rolling contact fatigue failure of the carburized gear will first initiate at subsurface rather than surface. Compared with the un-carburized gear, the rolling contact fatigue lives of the carburized gear under all load conditions are significantly improved. Under heavy load conditions, the carburized layer significantly reduces the fatigue damage mainly due to the benefit to inhibit the accumulation of plasticity. Influence of the residual stress is also investigated. Under the nominal load condition, compared with the residual stress-free case, the existence of the tensile residual stress causes remarkable deterioration of the rolling contact fatigue life while the compressive residual stress with the same magnitude leads to a moderate growth of the rolling contact fatigue life. As the load becomes heavier when plasticity becomes notable, the influence of the initial residual stress on the life is somewhat weakened.

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