Exclude Sets from Fatigue Calculation
In addition to assigning sets, you can also specify which sets to exclude from the fatigue calculation.
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Click the Material tool.
Figure 1. 
The Assign Material dialog opens. - Use the drop-down menu at the top of the dialog to select Sets.
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On the bottom half of the dialog, select the entity sets to be excluded from
fatigue calculation.
Tip: Use the selection icons to quickly select all, none, or reverse your selection of sets.