Abstract
Multiaxial fatigue failure criteria are formulated in time and frequency domain. The number of frequency domain criteria is rather small and the most popular one is the equivalent von Mises stress criterion. This criterion was elaborated by Preumont and Piefort on the basis of well-known von Mises stress concept, first proposed by Huber in 1907, and well accepted by the scientific community and engineers. It is important to know, that the criterion was developed to determine the yield stress and material effort under static load. Therefore the direct use of equivalent von Mises stress criterion for fatigue life prediction can lead to some incorrectness of theoretical and practical nature. In the present study four aspects were discussed: influence of the value of fatigue strength of tension and torsion, lack of parallelism of the SN curves, abnormal behaviour of the criterion under biaxial tensioncompression and influence of phase shift between particular stress state components. Information contained in this article will help to prevent improper use of this criterion and contributes to its better understanding. KEYWORDS. Mises stress; Frequency domain; Multiaxial fatigue.
Highlights
The direct use of equivalent von Mises stress criterion for fatigue life prediction can lead to some incorrectness of theoretical and practical nature
Multiaxial fatigue life criteria are used during fatigue life prediction to compute equivalent uniaxial strain or stress state
One of them is the criterion of Equivalent von Mises Stress (EMS), which is nowadays more and more popular and well accepted by engineers [6]
Summary
Multiaxial fatigue life criteria are used during fatigue life prediction to compute equivalent uniaxial strain or stress state. This procedure is essential for the calculation of final fatigue life based on uniaxial fatigue characteristics. There are only few propositions dedicated for frequency based fatigue life assessment were the frequency domain definition of the criterion is expected [4, 5]. Provided information are highly important for engineers which are using equivalent von Mises stress in frequency domain as well as for researchers who are working on new multiaxial fatigue failure criteria where von Mises stress is using as a part of the definition
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