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Paper Title : Effect Of Micro Structural Attributes On Wheel And Rail

ISSN : 2395-1303
Year of Publication : 2021
10.5281/zenodo.7337003

Authors: Jayakrishnan Nair M.

         


Abstract
- Nowadays, the railway is regarded as a fast, efficient, and secure mode of transportation. The issue of rail and wheel contact is one of the most fundamental aspects of the railway system because improper interactions cause problems such as wear and have a negative effect on the train's dynamic functioning. Trains operate within the constraints imposed by friction between railway wheels and rail surfaces. Inadequate friction causes poor adhesion during braking, which is dangerous because it results in longer stopping distances. Inadequate friction is also a performance issue because it affects traction, limiting the amount of tangential force that can be developed when curving. Delays occur when a train travels through areas with poor adhesion while in service. Rail flaws are commonly referred to as'squats' when they resulted from rolling contact fatigue damage, and as'studs' when they were associated with a white etching layer caused by the transformation from pearlitic steel due to friction heat generated by wheel sliding or excessive traction. This type of rail surface flaw causes wheel/rail impact, large amplitude vibration of the track structure, and poor ride quality. From the fracture mechanical and material scientific standpoints, the root cause and preventive solution to this defect are still being investigated. The dynamic interactions between the vehicle and the track impose vibrations and acoustic radiations, transforming the railway corridor into a moving vibro-acoustic source. The dynamic amplification of loading conditions and reflected vibration effects on infrastructure and rolling stocks is significantly increased when either the wheel or rail is imperfect.

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Keywords
- Wear , Wheel–rail contact ,Railway system , Surface roughness ,Transportation , Inappropriate interaction