In order to study the influence of the temperature-dependent material property on the wheel-rail contact behavior and frictional temperature rise,a three-dimensional wheel-rail thermal-mechanical coupling model considering the temperature-dependent material property was proposed in this paper,which could consider the longitudinal and lateral creepage rates and spins to simulate the service state of the wheel-rail system more realistically.In this paper,the influence of the thermal-mechanical coupling modeling method on the wheel-rail frictional temperature rise and contact stress was first studied.Subsequently,this model was applied to the simulation of vehicle-rail interaction of subways running on a small radius curve.The results show that when the temperature reaches 450℃,the wheel-rail contact stress is significantly reduced by 20%.After considering the thermal-mechanical coupling modeling,the predicted temperature rise of wheel-rail interface is significantly lower than that without considering the thermal-mechanical coupling modeling.When the creepage rate is 0.16,the difference between the two can reach 51%.Due to excessive creepage rate and spin,the wheel-rail frictional temperature rise will increase sharply to 750℃when subways run on a small radius curve.Therefore,the wheel-rail thermal-mechanical coupling modeling should be considered to avoid overestimating the wheel-rail frictional temperature rise and wheel-rail contact stress.
关键词
摩擦温升/轮轨接触/热力耦合/车辆-轨道耦合动力学/轮轨损伤
Key words
frictional temperature rise/wheel-rail contact/thermal-mechanical coupling/vehicle-rail coupling dynamics/wheel-rail damage
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