Effect of multiple inclusions on heavy-duty railroad rail's fatigue life
Non-metallic inclusions can easily cause fatigue damage.In this article,in order to explore the influence of the non-metallic inclusions'characteristic parameters on the heavy-duty rail's fatigue performance,the ABAQUS finite-element soft-ware is used to set up the analytical model of the heavy-duty rail;efforts are made to simulate the stress state of the rail containing inclusions with the external load and predict the fatigue life of the rail containing multiple inclusions with the help of the FE-SAFE fatigue simulation software.The results show that compared with those soft plastic MnS inclusions,the hard brittle Al203 inclu-sions have a greater effect on the rail's maximum stress;when the inclusions are located at the high stress area of the rail,the maximum stress exerted on the curve-section rail is greater than the maximum stress exerted on the straight-section rail with the external load;when the adjacent inclusions are at a critical distance from each other,the horizontal distribution of multiple inclu-sions has a greater effect on the stress exerted on the rail than the vertical distribution,and as the distance between adjacent inclu-sions becomes smaller,the maximum stress exerted on the rail matrix also becomes smaller;multiple adjacent inclusions cause a sudden decrease in the rail's fatigue life,and the rail containing four adjacent inclusions has a shorter fatigue life than the rail containing two inclusions.
rail inclusionsinclusions materialcurve-section railfatigue life
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