Fatigue provides life, damage, and safety factor information and uses a stress-life or strain-life approach, with several options for handling mean stress and specifying loading conditions. An example of the strain-life approach is a part/body with notch where, although the nominal response is elastic, the local response may present as a plastic. Review the following sections with regards to fatigue material properties, the theory of the calculations associated with the material properties, loading conditions, and results.