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Defining Fatigue based on Harmonic Results

To define a fatigue event based on results from a linear dynamic harmonic study:

  1. Set up and run a linear dynamic harmonic study.
  2. Create a fatigue study. In the Study PropertyManager, under Options select Harmonic-fatigue of sinusoidal loading .
  3. In the fatigue study tree, right-click Loading (Harmonic) and select Add Event.
  4. In the Add Event (Harmonic) PropertyManager:
    1. Under Study, select the harmonic study to associate the fatigue event.
    2. Under Plot Step, select the frequency (or plot step) of the sinusoidal fatigue loading.
    3. Under Scale and Cycles, enter the number of Cycles for this event and the Scale Factor that applies to the stress results from the selected harmonic study.
    4. Click .
  5. Right-click the top study icon and click Define Function Curves to associate an S-N curve to the material.
  6. After you run the fatigue study, you can view plot results for Life (number of cycles that causes fatigue failure, Damage (percentage of the life of structure consumed by the fatigue event), and Load Factor of safety against fatigue failure.

You can create multiple fatigue events that are based on the same linear dynamic harmonic study. The software assumes that the events occur sequentially one after the other without any interaction. The von Mises stress is used to calculate the equivalent alternating stress for extracting the number of cycles from the S-N curve.



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