Exclude Sets from Fatigue Calculation In addition to assigning sets, you can also specify which sets to exclude from the fatigue calculation. 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. 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.