In the paper [1] assumptions for fatigue life calculations in the low- and high- cycle fatigue ranges of metalalloys, have been formulated. Three calculation methods: that expressed in stresses, strains and a mixed(stress-strain) one, have been there presented. In this paper results of fatigue life calculations of C45 steelperformed in line with the above mentioned methods have been described, and their comparative analysishas been made. The calculations have been carried out for two-level and multi-level load programs of thevarying parameters: maximum load within a load program and different values of spectrum filling factor.The comparative analysis of the results of fatigue life calculations in compliance with the above mentionedmethods makes it possible to assess differences in the results and depenendence of the differences on valuesof load program parameters.
