Abstract
This chapter discusses the stress-based uniaxial fatigue analysis. The uniaxial fatigue analysis is used to estimate the fatigue life of a component under cycling loading when the crack is initiated due to a uniaxial state of stress. The fatigue life of a component refers to the fatigue initiation life defined as the number of cycles (N) or reversals (2N) to a specific crack initiation length of the component under cyclic stress controlled tests. Note that one cycle consists of two reversals. The stress in a cycle can be described either by stress a mplitude (Sa) and mean stress (Sm) or by maximum stress (Smax) and minimum stress (Smin). Since Sa is the primary factor affecting N, it is often chosen as the controlled or independent parameter in fatigue testing, and consequently, N is the dependent variable on Sa.
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