Abstract
1. Since the amount of energy irreversibly dissipated in a metal to fractute is not constant when there is a variable stress amplitude, the construction of energy criteria of fatigue should be based on experiment data. 2. In connection with the change in the fracture mechanism in the region of the transition from low-to high-cycle fatigue, there is also a change in the parameters of the relationship between static and cyclic energy characteristics. This change must be considered in developing methods of calculation. 3. The fatigue curves calculated from well-known energy criteria are for most materials displaced from the experimental curves. 4. Based on the above-discussed energy relations, a function was proposed to describe fatigue curves with sufficient accuracy relative to empirical results.
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