Abstract
In the present and the next chapter, an approach is developed to account the stress gradient effect on fatigue life of springs. The applied method of the analytical description is based on two steps. The first step provides the description of fatigue life of the homogeneously stressed material subjected to the cyclic load. This problem is studied in this chapter. Common methods for the estimation of fatigue life, based on Goodman and Haigh diagrams, stress-life and strain-life approaches, are briefly summarized. More attention is paid to different method of fatigue analysis, which is describes the crack growths per cycle. The expressions for spring length over the number of cycles are derived. The second step uses the weak-link concept for the non-homogeneously loaded structural elements. The estimation of the fatigue life utilizes the closed-form solutions for fatigue crack propagation from this chapter. The weak-link is applied for the evaluation of fatigue life of helical spring in Chap. 9.
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