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Found 2 results

  1. I am doing the fatigue practice and at my practice file. I don't know what FATLOAD mean exactly. For example if our model today will subject a F=100N At TID I know we need to set the TABLE to input and when I plot the .csv file I seem it look like the Load Time History photo. So it this mean our total time is 2500 sec? And the load have positive and negative for scale 1 and -1? (At here our model will subject 100N & -100N for 2500sec) And the LDM I just can't know about it. Finally what is mean for the SCALE? Because we have load time history we can see our load is for 1 and -1. At here we set 3 so that means out load will scale for 3? (Final it will ill subject 300N & -300N for 2500sec)
  2. 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.
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