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http://dx.doi.org/10.7782/JKSR.2017.20.5.649

Fatigue Life Evaluation for Used Rail on Track Types  

Kang, Sung Won (Department of Railway Construction, Graduate School of Railway, Seoul National University of Science & Technology)
Lim, Hyung-Jun (Department of Railway Construction, Graduate School of Railway, Seoul National University of Science & Technology)
Park, Yong-Gul (Department of Railway Construction, Graduate School of Railway, Seoul National University of Science & Technology)
Publication Information
Journal of the Korean Society for Railway / v.20, no.5, 2017 , pp. 649-657 More about this Journal
Abstract
In this study, fatigue testing was carried out for long-term use of rail according to track type. From S-N curves for 50%~0.01% failure probability, the fatigue life of the long-term use rail for each track type was derived using the weight probability analysis technique on the experimental data. Because the rails used in the fatigue test have different cumulative tonnages, the number of repetitions was modified by averaging the cumulative tonnage. In addition, the bending stresses of rail bottoms, considering rail surface irregularities, track support stiffnesses and train speeds, were evaluated using the predicted rail bending stresses derived from existing studies. As a result, for rail fatigue life evaluation, the fatigue life of rail on the ballast track was found to be more than 200 million tons higher than the standard value for rail replacement. Also, the fatigue life of rail on concrete track is more than 300 million tons higher than that on ballast track. The Haibach rule is adaptable for the fatigue life evaluation of rail for stress range under fatigue limit.
Keywords
Fatigue life; Laid rail; Periodic replacement; Concrete track; Ballast track;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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