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Comparative analysis of cyclic properties of metals obtained in conditions of stress and strain range diversification control on the example of C45 steel

Szala G.

Journal of Polish CIMAC

2011

Vol. 6, no 3

305-312

Cyclic properties of metals are obtained in conditions of sinusoidal loading at stress constant temperature or at constant amplitude of total strain. In the first case fatigue is characterized by the S-N Wohler curve applied in calculations in the range of high cycle fatigue. In the second case fatigue is characterized by the Mason-Coffin curve (ĺac - 2Nf) applied in low cycle fatigue calculations. Characteristic that enables transformation of the curve into the one and suitable reverse transformation is the Ramberg-Osgood (ĺ – ó) cyclic strain curve. In the paper there was confirmed that there are differences between (ó - N) and (ĺac - 2Nf) curves determined in stress and strain control conditions. The fact may have an essential influence on results of fatigue calculations in amplitude variable loading conditions (i.e. random loading or programmed) that values belong to both ranges LCF and HCF of fatigue.