Abstract
This chapter provides an overview of gigacycle fatigue regime. When the fatigue curve or SN curve is defined, it is usually done in reference to carbon steels. The SN curve is generally limited to 107 cycles, and it is admitted, according to the standard, that a horizontal asymptote allows one to determine a fatigue limit value for an alternating stress between 106 and 107cycles. Beyond 107 cycles, the standard considers that the fatigue life is infinite. For other alloys, it is assumed that the asymptote of the SN curve is not horizontal. The prediction of gigacycle fatigue is based on two different mechanisms: initiation is related to flaws and prediction is derived from stress concentration, fracture mechanics, or the short crack approach and initiation is not related to defect; in this case, microstructure is a key parameter, such as grain size, interface, load transfer, and microplasticity. To design a model gigacycle fatigue initiation first, a new SN curve must be determined up to 1010 cycles, which is, in fact, more than the fatigue life of all technological machines.
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