期刊
ENGINEERING FAILURE ANALYSIS
卷 128, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2021.105604
关键词
Sleeper hanging; Uneven settlement; Wheel-rail rolling contact; Rail degradation
资金
- Scientific Research Plan of China Railway [K2019G010]
- Science and Technology Research Plan of China Academy of Railway Sciences [2020YJ063]
A transient rolling contact model accounting for the nonlinear displacement-force properties of hanging sleepers was proposed in the study, revealing that the severity of sleeper hanging is significantly affected by rail surface irregularities and can exacerbate wheel-rail impact and increase contact force, leading to plastic deformation of the rail material. Impacts on adhesion-slip states and rolling contact fatigue due to sleeper hanging defects were found to be minimal.
In this study, a wheel-rail transient rolling contact model capable of accounting for the nonlinear displacement-force properties of hanging sleepers is proposed. The sleeper hanging status affected by rail irregularities is an input for an analysis of the wheel-rail contact behavior and related rail degradation in terms of plastic deformation and rolling contact fatigue. The results indicate that the severity of sleeper hanging is significantly affected by the geometric characteristics and the relative position with respect to the sleepers of the rail surface irregularity. The sleeper hanging defects aggravate the wheel-rail impact and increase the wheel-rail contact force amplitude, contact patch size, pressure, and von Mises stress, thus exacerbating the plastic deformation of the rail material. It was also found that the sleeper hanging defects rarely affect the distribution of the adhesion-slip states and rolling contact fatigue. The knowledge gained can serve as guidance for evaluating the condition and conducting the maintenance of ballasted railway tracks.
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