Fatigue Life of S355JR Steel under Uniaxial Constant Amplitude and Random Loading Conditions

摘要

The results of fatigue tests of samples made of S355JR steel under random tension-compression with nonzero mean stress are presented. The procedure of experimental research is described. The obtained experimental results are presented with the use of Wohler fatigue graphs. The algorithm for the determination of the fatigue life uses, among other things, a rainflow cycle counting procedure, as well as the Palmgren-Miner linear damage accumulation hypothesis and six selected models that take into account the effect of mean stress on the tested durability. We also display the plots for comparison of the experimental and computed lives. It is indicated, which of the considered models describes the impact of the mean stress on the fatigue life of the tested material within the scatter error 3.