Thermo-mechanical Analysis Of Railway Wheel Rail Rollingsliding Contact

Thermal damage caused by frictional heat of rolling-sliding contact is one of the most importantrnfailure forms of wheel and rail. The coupled mechanical–thermal behavior of wheel and railrnmaterials under rolling contact is studied to determine the temperature rise due to the frictionalrnheat. The wheel–rail frictional rolling contact problem is solved using the both hertz three–rndimensional finite element (FE) method. The FE model considers the wheel tread–rail top contactrnwith partial-slip and converts the frictional energy into the heat as an attempt to estimate therntemperature rise. The assembly of wheel-rail geometry is created by CATIA V5R20 software.rnThe finite element program ANSYS workbench is used to model the couple of thermos-mechanicalrnrolling –sliding contact analysis and used to simulate the loading and boundary conditions of thernwheel-rail rolling/sliding contact. When the couple of mechanical – thermal (maximum pressurernand different heat flux) applied on the wheel – rail rolling/ sliding contact, it generates a maximumrnamount of heat and stress between rail and wheel. This cause plastic strain development andrnreduction of stress fatigue life for the increased value of loads that resulted from slippage as canrnnote from analysis and simulation results. Rolling contact stress states and material response ofrnwheel – rail under four traction coefficient and the same varying of sliding velocity wererninvestigated. 3D coupled thermomechanical FE model were developed to analyze the temperaturernrise due to high applied load at contact and the thermal influence on residual stress-strain, wearrnand rail life.

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