Influence of Fastener Stiffness Nonlinearity on Wheel-Rail Transient Rolling Contact Behavior in Corrugated Area
The stiffness of the rubber pad of the WJ-8 fastener exhibits nonlinear characteristics during long-term service,and the static stiffness decreases with the increase in the load.In order to improve the calculation accuracy of the three-dimensional transient rolling contact finite element model,the LMA tread wheel and CHN60 rail were used.Based on the explicit integration algorithm,the linear elastic fasteners in the previous research were transformed into nonlinear fasteners to establish a three-dimensional wheel-rail transient rolling contact finite element model considering the nonlinear characteristics of fastener stiffness.The influence of stiffness nonlinearity on the high-frequency dynamic response and transient contact behavior between wheel and rail corrugation was studied,and the change of wheel-rail contact force and axle box acceleration in the time-frequency domain under corrugation conditions was analyzed.The results show that the nonlinearity of the fastener has an obvious effect on the change of the wheel-rail contact force.The main manifestation is that when the wheel travels to the front end of the fastener,the strong vibration makes the rubber pad soft,which reduces the contact force of the wheel and rail.In addition,when the wheel travels above the fastener,the vibration is weakened under the action of the axle load;the stiffness characteristic increases the wheel-rail contact force,and the difference between the wheel-rail force changes is up to 13.1%.
stiffness nonlinearitytransient rolling contactsrail corrugationexplicit finite element method
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维普
