The classical Von Mises stress equivalent process is built by the concept of static equivalent stress and extended to dynamic conditions, furthermore some problems will appear, even an error result will be produced if using the equivalent criterion mechanically.In this paper ,the authors introduce some amendment algorithms based on classical Von Mises stress, the amendatory Von Mises equivalent stress power spectral density has the same distribution as the component of stress ,both of the stress response magnitude located near the mode frequency, this is reasonable for the structural dynamic feature and the circular load feature, and the modified stress is regarded as a Gaussian process, which can estimate fatigue life based existing models in the frequency domain.
Key words
vibration fatigue /
Von Mises stress /
life prediction /
power spectral density
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References
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