Mechanical Analysis And Fatigue Optimization Of Bogie Rubber Ball Hinge Under Operation Load

Rubber material is widely used in trains because of its superior performance.At present,the main failure form of rubber ball hinge in engineering is fatigue failure.Its service life determines the safety and reliability of vehicles,so it is of great significance to accurately evaluate the fatigue life in engineering.This thesis focuses on mechanical analysis and fatigue optimization of rubber ball hinge,introduces orbit excitation,analyzes its mechanical properties,and proposes a fatigue life extension scheme.The main work is as follows:(1)The finite element model of vehicle dynamics was established by using the multi-body dynamics theory,and the rail excitation was added to extract the load on rubber ball hinge at both ends of the anti-snake damper,and the one-dimensional amplitude-frequency load spectrum of rubber ball hinge was established to make the simulation more consistent with the actual operating environment of rubber ball hinge.(2)The basic mechanical properties of rubber material were tested,and the constitutive model of rubber material was obtained,which provided parameters for finite element simulation.Static stiffness test was carried out for rubber ball hinge samples,which provided a reference basis for the accuracy of finite element model establishment,and at the same time,mechanical properties and stress distribution of rubber ball hinge were obtained.(3)The finite element model of rubber ball hinge was established to verify material parameters and model accuracy.By comparing the simulation results of rubber ball hinge load spectrum load and triangle wave load,it is found that triangle wave can replace the actual load to load rubber ball hinge within a certain error range.(4)Structural optimization of rubber ball hinge was carried out based on response surface method.By changing structural parameters of rubber layer,the fatigue life was improved while the stiffness remained unchanged,and the optimal scheme was selected for sample trial production and fatigue analysis to improve the service life of bogie rubber joints.