Effect of Wear Threshold on Prediction for Rolling Contact Fatigue Crack Initiation and Wear Growth of Rail
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1.Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China;2.Shanghai Key Laboratory of Rail Infrastructure Durability and System Safty,Tongji University, Shanghai 201804, China;3.Railway Engineering Research Institute, China Academy of Railway Science Co., Ltd., Beijing 100081, China

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U216.3

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    Abstract:

    The determination of wear thresholds by the methods of wear vertical depth and wheel cycles was presented. The effect of wear thresholds on the prediction of rail profile, wear growth rate, fatigue damage, crack initiaiton position and life was analyzed. The results show that the error by the cubic interpolation spline with different wear thresholds to smooth rail profiles can be ignored. The wear thresholds have little effect on the average wear growth rate and an obvious impact on the fatigue damage. With small wear thresholds, such as the wear depth h≤0.04 mm or the wheel cycles t≤3.0×104, the predicted crack initiation position and life is close to each other. The simulation efficiency is slightly lower. Compared with the results at smaller wear thresholds, the predicted crack initiation position at larger wear thresholds has a deviation of less than 5.0%. The crack initiation life has a maximum deviation of 13.5%. And the simulation efficiency is increased by 50%~60%.

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ZHOU Yu, SUN Dingren, WANG Shuguo, WANG Pu. Effect of Wear Threshold on Prediction for Rolling Contact Fatigue Crack Initiation and Wear Growth of Rail[J].同济大学学报(自然科学版),2020,48(9):1336~1343

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  • Received:March 03,2020
  • Online: September 27,2020
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