Prediction of rail fatigue crack initiation life of No.12 alloy steel single turnout with combined frog
LIU Qibin
Abstract：The static and dynamic analysis models of No.12 alloy steel single turnout with combined frog are established based on finite element analysis software.The fatigue sensitive are-as of turnout rail are located by the dynamic simulation results of the dynamic model when the train is passing through the turnout in a straight or branch line,the load spectrums of each sensi-tive area are extracted for fatigue analysis.The internal stress of rails in each sensitive area under unit load are researched by the static model.The fatigue crack initiation lives of rails in sensitive areas are predicted based on Miner linear cumulative rule.The effects of axle-weight and vehicle speed on the fatigue crack initiation lives of rails are studied.A prediction formula of fatigue crack initiation lives of rails in sensitive areas under different axle loads and vehicle speeds is given.The results show that the fatigue crack initiation lives of rails in different sensitive areas of turnout va-ries greatly,and axle-weight and vehicle speed when the train is passing through the turnout in the branch line have great effects on the fatigue crack initiation lives of rails.The fatigue crack in itiation life decreases significantly with the increase of axle-weight,and it also decreases with the vehicle speed when the train is passing through the turnout in the branch line.
Keywords：railway trackalloy steel single turnoutcombined frogfatigue crackinitiation lifeMiner linear cumulative rule
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 130-135 )