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Dear all, As I am quite new in fatigue analysis with optistruct I would like to confirm one thing please. We have two loads L1 and L2. Each of them has a FatLoad, so FATLoad1 FATLoad2. And we put them in a Fatseq - fatevn (so fatseq=fatenv=fatload1 + fatload2). Each load has a table (TABFAT) with two points which is: Tabfat1 ---> y1=0, y2=1 and Tafat2 ---> y1=1 and y2=0 So as you can see the two loads are out of phase. When load1=1 then load2=0 and when load1=0 then load load2=1. When we run the analysis, is this phase difference respected?? Basically I do not want to add stresses at the same time, but run fatigue as the two loads are happening on a cycle one after the other. So when we get the life out, we check how many times the part can survive the sequence: Load1-Load2 , load1-load2, load1- load2.......and not (Load1+load2), (Load1+load2), (Load1+load2).... Could someone please confirm if we understand that correctly, and if optistruct will work this way (maintain phase difference)? I hope I explained the problem clearly enough and I would be really grateful for any response.