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Vin566

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About Vin566

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  1. Hi, have the developers sent you any feedback about this strange bug?
  2. Hi, thank you for your answer. I'm doing the fatigue analysis. The results are based on the static analysis. Do you think by using transient analysis the accuracy of the results could be improved? I think the fatigue life depends on how the periodic loading is applied. As long as it is one period, the time may not be important. Please correct me if my understanding is wrong.
  3. Thank you for your information. I do misunderstand it. I thought I need to import all cycles. Now I know 1 cycle is enough. But there is another question. From the help file, it says the fatigue analysis only cares about the highest peak and lowest valley values. For me, it seems that for an input in terms of sine function, in one cycle, I only need to specify 2 data points: peak and valley. The remaining are useless, even if I put them into the table. Do I understand it correctly?
  4. Sure. I attached a very simple testing file, and the corresponding .csv file. Once I run that .fem file, the error I mentioned above will pop up. I hope you can help me solve this problem. Thank you. test.fem test.csv
  5. Hi, I am using Hyperworks 2017, which is the latest version. I don't think it is a version problem. If I import less cycles , for example, 2 cycles (18 data), it can work. It is so weird. But if I import 60 cycles (540 data), the same error pops up: *** INTERNAL PROGRAMMING ERROR *** in file "fatdmgapp.F", at location # 1808. Can you help me with it? Best,
  6. Hi, I started to learn the fatigue simulation in Hyperworks. I got two questions. 1. I imported the cyclic loading file (in .csv format), and create new TABFAT load collector. However, I found there was only one column. In my original file, I have two column. The left column is time, and the right column is loading. But only the right column is kept. Why? Is it possible to import two columns together and define my own loading cycles? 2. In the Optistruct solver, I got errors: *** INTERNAL PROGRAMMING ERROR *** in file "fatdmgapp.F", at location # 1808. ioerr(1) = 4 **** ABORTING RUN DUE TO AN INTERNAL ERROR I don't understand what the "fatdmagapp" means. Here is the loading I applied. For each cycle, I have 9 values. Totally I have 2000 cycles. I couldn't see where is wrong. Can any one help me with this problem? PS: whenever I switched back to use Load1.csv from the tutorial file, everything works. So I am sure the other procedure is correct.
  7. I still cannot understand it quite well. For example, if I put scale factor equal to 10, I know the load has been scaled up 10 times, and the fatigue life will decrease a lot. But what benefit I can obtain from the new results? In my understanding, scaling means the difference between the simulation and real product become large? So I don't know what's the advantage of using it?
  8. Can you share me with the information about how to set SCALE & OFFSET parameters? I checked other resources, but I still didn't get the meaning of these two factors.
  9. Hi, thank you for pasting the equation. But I still feel confused. What this scale factor used for? To scale up/down the statics stress value? What's the benefit of doing it? I don't get it.
  10. Hi, I meet some trouble when using fatigue process feature in Hypermesh. I already learned the tutorial part about this feature and I knew every step. However, when I build a very simple model (a cubic), applying the force on one side and fixing the other side, exporting to .fem format, then repeated these steps again, I couldn't get any analysis results. The analysis was successful, but both life and damage showed no number when I switch to the contour plot. I also defined the shell component on the surface, like what the tutorial does. Can anyone help me figure out what step do I miss? Or some small details I forgot to consider? Thank you.
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