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.
Keywords: Fatigue, fatigue life, fatigue strength, life prediction, road load spectrum, wheel hub.
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