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Volume 56 Issue 3
Jun.  2021
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Journal of Southwest Jiaotong University  > 2021  >  56(3): 611-618.
WANG Junping, ZHOU Yu, SHEN Gang. Effect of Rail Hardness on Fatigue Cracks Initiation and Rail Wear[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 611-618. doi: 10.3969/j.issn.0258-2724.20190184
Citation: WANG Junping, ZHOU Yu, SHEN Gang. Effect of Rail Hardness on Fatigue Cracks Initiation and Rail Wear[J]. Journal of Southwest Jiaotong University, 2021, 56(3): 611-618. doi: 10.3969/j.issn.0258-2724.20190184
shu

Effect of Rail Hardness on Fatigue Cracks Initiation and Rail Wear

doi: 10.3969/j.issn.0258-2724.20190184
  • Received Date: 26 Mar 2019
  • Rev Recd Date: 26 Jun 2019
    • Available Online: 17 Dec 2020
  • Publish Date: 15 Jun 2021
    Abstract
  • In order to study the relationship between rail hardness and rail wear and fatigue cracks initiation life, based on the Archard wear model and the critical plane fatigue cracks initiation prediction model, the prediction method for the coexistence of rail fatigue cracks initiation and wear was presented by combining wear and sectional iteration of profile changes and fatigue damage accumulation. The wear growth, fatigue damage accumulation and fatigue cracks initiation life of 4 kinds of rails with different hardness were researched. The results show that the fatigue cracks initiation life predicted by above-mentioned method has a good agreement with that of the field observation. The rail with high hardness can reduce wear and prolong the fatigue cracks initiation life, which is suitable for sharp curves. Among the rails with four hardness, the average wear growth rate can be reduced by about 3% − 6% and the fatigue cracks initiation life can be prolonged by about 9% − 12% when the hardness of the rail increases by every 10 HBW. Comparing to the U78CrV/U76CrRE hot rolled rail, the average hardness of the U78CrV heat-treated rail increases by about 17.9% while the wear growth rate reduces by about 19.8% and its fatigue cracks initiation life prolongs by about 57.7%. With the wheel/rail friction coefficient of 0.3, the fatigue cracks are initiated at rail sub-surface which is below rail surface of about 1.0 − 2.5 mm and close to rail top center of about 15 − 18 mm in all 4 kinds of rails.

     

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