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Glossary
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Defining a Fatigue Event Based on Multiple Load Cases

To define a constant amplitude fatigue event based on multiple load cases, in the Add Event (Constant) PropertyManager:

  1. Set the Number of Cycles noofcycles.png associated with the fatigue event.
  2. Set Loading Type to Find Cycle Peaks .
  3. In the Study Association box :
    1. Select a static, nonlinear or dynamic time history study in the first row. You can enter a scale factor under Scale. The program multiplies the stress components of the reference study by this factor to evaluate alternating stress values.
    2. For a nonlinear or dynamic time history study, under Step enter a particular time step. The output of this particular solution step is considered for the evaluation of alternating stress values.
  4. Insert a new row by double-clicking in the No column. Select a study and enter a scale factor. You can enter up to 40 load cases.
  5. Click .
The program evaluates at each node the differences in the stress component values for all possible combinations of stress peaks and determines the load combination that produces the largest stress fluctuation.

Contents

  • Single Fatigue Event Based on Multiple Loads

    The program calculates the alternating stresses for each node by considering the combination of peaks from different fatigue loads. The fatigue loads can refer to one or more static studies, or to a particular solution step of a nonlinear or time history linear dynamic study.



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