Title:Load Spectrum Compiling and Fatigue Life Estimation of the Automobile Wheel Hub
Volume: 14
Issue: 3
Author(s): Xintian Liu*, Yang Qu, Xiaobing Yang and Yongfeng Shen
Affiliation:
- School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201600,China
Keywords:
Fatigue, fatigue life, fatigue strength, life prediction, road load spectrum, wheel hub.
Abstract:
Background: In the process of high-speed driving, the wheel hub is constantly subjected to
the impact load from the ground. Therefore, it is important to estimate the fatigue life of the hub in
the design and production process.
Objective: This paper introduces a method to study the fatigue life of car hub based on the road load
collected from the test site.
Methods: Based on interval analysis, the distribution characteristics of the load spectrum are analyzed.
The fatigue life estimation of one-dimensional and two- dimensional load spectra is compared
by compiling load spectra.
Results: According to the S-N curve cluster and the one-dimensional program load spectrum, the
estimated range fatigue life of the hub is 397, 100km to 529,700km. For unsymmetrical cyclic loading,
each level means and amplitude of load were obtained through the Goodman fatigue empirical
formula, and then according to S-N curve clusters in the upper and lower curves and two-dimensional
program load spectrum, estimate of the fatigue life of wheel hub of the interval was 329900km to
435200km, and then one-dimensional load spectrum fatigue life was reduced by 16.9% - 17.8%.
Conclusion: This paper lays a foundation for the prediction of fatigue life and the bench test of fatigue
durability of autoparts subjected to complex and variable random loads. At the same time, the
research method can also be used to estimate the fatigue life of other bearing parts or high-speed
moving parts and assemblies.
