1. Clarifications and terminology
Fatigue refers to the gradual damage caused to structural details by fluctuating or repeated stresses, leading to the development of cracks that can cause them to fail.
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All structural details susceptible to fatigue must be identified and fatigue-tested.
In the case of a smooth part, cracking can originate from microscopic grain-scale defects, or from edge defects caused by flame cutting or drilling, for example.
In the case of welded constructions, there are always defects due to the weld: in this case, it's rather from a weld bead that a crack can start.
Note :if crack initiation is expected at the root of the weld bead, finishing treatments can delay this phase and thus considerably...
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Clarifications and terminology
Principles of fatigue testing
Bibliography
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