Browsing by Author "Abdulhakim, Merdassa"
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Item Analysis of mechanical and thermal loads effects on Wheel-rail material during slippage(AAU, 2015-03) Abdulhakim, Merdassa; Birhanu, Beshah (PhD)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.