Analysis of mechanical and thermal loads effects on Wheel-rail material during slippage
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Date
2015-03
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Publisher
AAU
Abstract
Slippage is the main cause of damage and strength reduction of rail/wheel material. During
rail-wheel rolling contact there always exist micro slippages at contact area. Even if normal
movement of railway wheel is combination slip-stick phenomena, slippage will cause severe
effect the wheel and rail material. This paper focus on the analysis of effects of longitudinal
slippages at rail head and wheel tread contact area based on elastic-plastic model by
introducing elastic and plastic material model for the rail and wheel. The normal load is
analyzed with both hertz and FE method whereas the tangential load is analyzed using
Coulomb’s and Johnson/vermulen method. Beside, Surface temperature of the interface for
different slip velocity is estimated analytically. The loads and boundary condition are
simulated for over contact area in order to predicate the effect using ANSYS 15 commercial
software. Based on the analysis and simulation the loads that developed during longitudinal
slippage create the high thermo-mechanical stress on contact area. This cause plastic strain
development and reduction of stress fatigue life for the increased value of loads that resulted
from slippage as can note from analysis and simulation results.
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Keywords
thermal loads, Wheel-rail, slippage