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Reduction in the failure resistance of a material over time as a result of repeated or cyclic applied loads.
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- Crack initiationThe first appearance of a fatigue crack in an item subject to repeated loads, usually based on visual inspection, but sometimes based on the use of nondestructive testing techniques.
- Critical crack lengthThe length of a fatigue crack at which the residual strength of the item is no longer sufficient to withstand the specified damage-tolerant load.
- Fatigue life1) For an item subject to fatigue, the total time to failure, e.g. crack initiation. 2) For a human, fatigue is weariness, exhaustion, or decreased attention related to labor, exertion, or stress. May also result from lack of sleep, circadian shifts, depression, boredom, or disease. May result in decreased ability to perform mental or physical tasks.
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