Establishment Of Design And Analysis Platform And Fatigue Life Research Of Wheel Hub

Wheel hub is one of security components of vehicle, therefore the reliability of the wheel hub directly or indirectly affects other related components, and even threats life and property safety of the passengers. In recent years, traffic accidents caused by faults of wheel hubs become more and more. Therefore, it is necessary to evaluate the reliability of wheel hub. The paper mainly studies from the topological optimization design of wheel hub, the establishment of parametric design and analysis platform of wheel hub and the fatigue life of wheel hub.The wheel hub spoke varies in a variety of forms, the number of wheel hub spoke, the bending degree of wheel hub spoke, and the pocket volume of wheel hub spoke back. The paper studies during the concept design stage of wheel hub, through introducing the wheel hub national standard test of cornering and impacting conditions of loads and constraints, in order to get the optimal wheel hub spoke shape, the wheel hub model is topological optimized to get the minimum volume with stiffness constraints.Parametric design and analysis platform of wheel hub can achieve the rapid design and strength check of wheel hub to get the satisfactory model. The platform is integrated with the secondary development of UG, ANSYS parametric language APDL, Visual C++and Coin3D. The model of wheel hub by putting the related parameters is completed and the key parameters are extracted to ANSYS call. In ANSYS, various analysis commands of wheel hub are written into Macro files by APDL. The force, size and other parameters are written and Macro files are called by functions in Visual C++, as a result, combined with open source software(Coin3D), an analysis platform of wheel hub properties is established which can complete the whole function of frame analysis and results view in one user interface. The establishment of this platform has a guiding significance on the design of wheel hub, which shorted the time, improved efficiency and reduced the cost compared with traditional design method.Fatigue failure of wheel hub is one of the principal failure forms. If the dangerous position of wheel hub and fatigue life can be predicted in wheel hub design, the maintenance and repair work of wheel hub can be done more effective. Referring to the driving test cycle in the city, load spectrum of the wheel is analyzed. Through finite element analysis, a stress-time curve of wheel’s dangerous point is obtained, and stress amplitudes modified every cycle are extracted to compile stress spectrum. According to fatigue analysis theory combined with S-N curve of the wheel, with stress amplitudes as basic parameter and improved Miner equation in fatigue life prediction, the fatigue life of wheel is finally measured by circular kilometers.