2. Choosing a safety factor

To calculate the fatigue life of a part, a safety factor must be chosen. This coefficient is often determined by company practice. We won't go into the various types of endurance diagrams that can be used to calculate safety coefficients. We will only present the Haigh and Goodman diagrams for uniaxial calculations, or for multiaxial calculations using the equivalent stress approach. Next, the definition in the case of a multiaxial fatigue criterion will be presented.