A fracture mechanics technique has been used to estimate the fatigue strength of welded joints, taking into consideration the fatigue behaviour of small fractures, in this study. An important use of this approach is to calculate the rate of crack propagation as a function of the difference between a force and the material threshold for crack propagation. For the assessment of the fatigue behaviour of notched steel plates, analytical fatigue models have been created. Outcomes have been compared with results of foreign economic activity in order to forecast service life.
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