A new roughness parameter to evaluate the near-surface deformation in dry rolling/sliding contact |
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| Affiliation: | 1. Department of Mechanical Engineering, Sharif University of Technology-International Campus, Kish Island, Iran;2. Department of Mechanical Engineering, Karabuk University, Karabuk, Turkey;3. Department of Mechanical Engineering, Sun Moon University, Asan, South Korea;1. MINES ParisTech, PSL Research University, Centre des Matériaux, CNRS UMR 7633, BP 87, F 91003 Evry, France;2. Computational Solid Mechanics Laboratory (LSMS, IIC-ENAC, IMX-STI), Ecole Polytechnique Fédérale de Lausanne (EPFL), Bât. GC, Station 18, CH 1015 Lausanne, Switzerland |
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| Abstract: | Within this work, a two-dimensional finite element model for rolling contact of a wheel on a rail is presented that accounts for the roughness of the contact surfaces. The rail material is modeled with elastic–plastic behavior. The maximum of the plastic shear strain is concentrated close to the surface of the rail and is mainly influenced by the surface roughness. A concept is proposed that demonstrates one crucial parameter of the roughness determines surface deformation (based on results of a sinusoidal roughness model). This roughness parameter depicts the ratio between asperity height and width. Numerical validation is achieved for predicting plastic shear strains in rough surfaces. The plastic shear strain is associated with surface damage, such as cracks and wear. |
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| Keywords: | Rough contact Wheel/rail interaction Surface deformation Damage |
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