Check the links: stress spectrum factor and number of load cycles to read the basics of these important parameters. Note especially how the stress history parameter is related to the stress spectrum factor.
After e.g. field measurements we are ready to input the stress spectrum factor and the number of load cycles in the guide. The stress spectrum factor is set to 0.1 and the number of load cycles to 800 000. The stress history parameter is computed by FATcomp to 0.04.
Picture 1: Stress history parameter guide
When we click on next the input is completed.
The next step in the computation is the guide for the thickness improvement, material and fatigue enhancement factors.