The paper presents an experimental study on the metalic elastic element, helical spring with bar diameter of 24,4 mm, under fatigue testing, for the purpose of establishing its lifetime and consequently its reliability. The load collective that was adopted and the number of cycles pertain to the conditions imposed by international norms. We have presented the Wohler load and fatigue resistance curves contained in UIC report ERRI B12 Rp60. Thus we have determined theoretically and experimentally, the lifetime as a component of the reliability of the studied metalic elastic elements, with the corresponding conclusions.
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