Fatigue Life Prediction of e-type Clip Fastener in Metro Based on Vehicle-rail Coupling Dynamics Analysis
The subway is an important part of urban transportation,and the fastener system is a key component of the subway track struc-ture,which plays a role in fixing the steel rails and reducing vibration and noise.The fatigue performance of the e-type elastic tie-plate fas-tening system in the subway was analyzed.Based on the theory of vehicle-track dynamics,a vehicle-track coupling model was established using the multi-body dynamics software UM,and the relationship between vehicle speed,track roughness types,curvature radius,and the dynamic response of the steel rail was studied.The fastening system was also simulated and calculated using the finite element software ABAQUS.The steel rail displacement obtained from the vehicle-track coupling dynamic analysis was used as the fatigue load,and the fatigue life of the elastic tie-plate was predicted and analyzed using stress fatigue calculation methods.The results show that the displacement re-sponse of the steel rail is less influenced by track roughness types and vehicle speed,while the acceleration response is more sensitive to both.The change of track curvature radius has a relatively obvious influence on the inner rail displacement,with a decrease in radius resul-ting in a noticeable upward shift of the inner rail displacement time history curve.At the same time,the effect on acceleration also increases,and the peak acceleration of the inner rail shows an increasing trend.The calculated fatigue life of the elastic tie-plate based on this model is 2.14×107 cycles,with the lowest life occurring at the small arc section behind the tie-plate,which is consistent with the actual fracture loca-tion.The initial installation clamping force of the tie-plate has a significant impact on its fatigue life.As the initial clamping force increases,the fatigue life of the tie-plate continuously decreases,and the rate of decrease tends to increase.To ensure the efficient operation of the tie-plate fastening system, the initial clamping force should be controlled within the range of 11 ～15 kN.
fastener systeme-type clipvehicle-rail coupling dynamicsfatigue life
万方数据
维普
