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Quantitative Wear Analysis of a Simulated Steel Wheel and Rail

Author: Kumar, Sudhir
Author: Margasahayam, Ravi
Corporate Author: Department of Mechanics, Mechanical and Aerospace Engineering, Illinois Institute of Technology
Corporate Report Number: IIT-TRANS-77-3
Date of Publication: 1977-07
Pages: 86
Contract: DOT-FR-64228

A preliminary analytical, parametric and experimental investigation of the combined friction-creep and wear behavior of a simulated steel wheel on a rail under dry, tractive conditions is presented. This study is aimed at enhancing the understanding of the complex wheel-rail wear problem in a quantitative manner. A dimensional analysis of the various parameters influencing the friction and wear behavior of the whee-rail system for tractive rolling process has been carried out. With the aid of both the analytical and dimensional analysis, generalized expressions for interrelationship of creep, wear, normal load, hardness, toughness; roughness and time have been derived to yield wear-creep, wear roughness and other non-dimensional expressions. Both laboratory and field considerations for tangent track are included. General quantitative wear relations derived were checked with experimental data showing reasonable agreement. From the experiments, it was found that the wear of the rail is proportional to the hardness of the wheel and vice versa. Wear of the rail increases both with friction coefficients and normal loads, however, increase in rail wear due increase in friction coefficients (>0.25) is much larger than its increase due to larger axle loads, e.g. those for 75 ton cars. Wear increases significantly with creep. Roughness of wheel and rail increases with cycles of loading. Increase in roughness is usually associated with increased wear. Wear-creep, wear-roughness and hardness-toughness Pi's seem to be significant in wear analysis.

S. Kumar
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