Multi-Axial Fatigue Strength Analysis of Wheel Based on FEA

Based on the UIC510-3 and the thermal load test,the load conditions for analyzing the fatigue strength of the wheel have been determined.The radial stresses under the operation conditions were analyzed by using finite element method and the fatigue strength of the wheel was evaluated.The multiaxial stress was converted into the uniaxial stress with the maximum principal stress method, and the fatigue strength under mechanical load was evaluated.It can be concluded that the fatigue strength can satisfy the requirement with the Haigh-Goodman fatigue limit equation.After converting the zero-tensile stress cycle into symmetrical cycle with Goodman equation,the fatigue strength under braking thermal load was evaluated to meet the strength requirement by using the S-N curve of plate material.The stress superimposing method was put forward for solving the stress superimposition under mechanical and thermal loads.The crack life was predicted under integrated effect of the mechanical stress and thermal stress.This fatigue strength evaluating results above showed that the integrated effort of the mechanical load and the grade braking load was the load factor of the crack.