The influence of loading program on the course of fatigue damage cumulation

In the paper, results of a comparative analysis of cyclic properties of specimens made of 30HGSA steel under constant-amplitude and programmed loading were presented. The analysis was carried out with the use of parameters of the characteristic hysteresis loop in function of the degree of fatigue damage. The analysis showed that courses of cyclic properties changes for chosen strain levels are very similar and do not depend on the loading program. It was shown that during damage cumulation it is possible to take into account the changes of cyclic properties.