The relation can be plotted to determine the safe cyclic loading of a part; if the coordinate given by the mean stress and the alternating stress lies under the curve given by the relation, then the part will survive.
12.
Where \ sigma _ \ text { a } is the alternating stress, \ sigma _ \ text { m } is the mean stress, \ sigma _ \ text { fat } is the fatigue limit for completely reversed loading, and \ sigma _ \ text { ts } is the ultimate tensile strength of the material.
