Fatigue is the progressive and localized structural damage that occurs when a material is subjected to cyclic or repeated loading.

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The load is defined as any physical quantity that reflects the excitation or the behavior of a system or component over time.

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A half-cycle is a pair of two consecutive extrema in the load signal, going from a minimum to a maximum or vice versa. A full cycle is a cycle consisting of two consecutive half-cycles.

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Durability is the capacity of an item to survive its intended use for a suitable long period of time. Good durability leads to good quality, company profitability and customer satisfaction.

S-N curves represent statistical models that characterize the material performance. S-N curve is defined as a graph of the cyclic stress against the logarithmic scale of cycles to failure.

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The endurance limit is the amplitude of the cyclic stress that can be applied to the material without causing fatigue failure. 

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