Abstract
Fatigue life prediction is an important part of the reliability and durability analysis of automobile components. Based on Wang and Brown’s framework, multiaxial random fatigue damage was adopted to predict the fatigue life of half‐shaft. The stress analysis of half‐shaft was resolved analytically to determine the local stress tensor in the potential area of fracture. The maximum shear strain fatigue damage parameter and the normal stress fatigue damage parameter were evaluated to predict the fatigue life of half‐shaft. The results show that the prediction method is reliable and meets the service life and safety requirements.
Highlights
In many engineering fields, the structures and components will crack and be fractured due to the accumulation of fatigue damage [1,2,3]
Bending or torsion loads are often treated separately [7, 8]. Most of these studies on half-shaft are based on uniaxial fatigue theory [9,10,11]
The theory of fatigue life under the uniaxial load is actively investigated by many researchers for decades, and it is well-accepted for its simplicity
Summary
The structures and components will crack and be fractured due to the accumulation of fatigue damage [1,2,3]. Bending or torsion loads are often treated separately [7, 8] Most of these studies on half-shaft are based on uniaxial fatigue theory [9,10,11]. Wang and Brown suggested using von Mises strain as the indicator for rainflow counting, and the time series need further manipulation before rainflow count [20] Their approach has been tested and validated by several researchers, compared to the fatigue life under the proportional or nonproportional load with a constant path pattern [21, 22]. The fatigue life of half-shaft under both 3dimensional random nonproportional forces and moments was analyzed based on the accumulative multiaxial fatigue damage.
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