Wpływ sekwencji obciążeń na trwałość zmęczeniową

Fatigue lives were studied in 45 steel specimens under random loading and the corresponding program loadings. In the program tests of four types of sequences were employed. This was done in increasing order of amplitudes (SR) increasing decreasing order (SRM), decreasing order (SM) and random order of amplitudes (SL). The variations of the fatigue life due to the random loading and program loadings SL and SRM were relatively small. The fatigue life was about 20% longer in the latter case. The fatigue life in the SR program test was at most twice times longer than in the random test.