Fatigue limit

Representative curves of applied stress vs number of cycles for steel (in blue and showing an endurance limit) and aluminium (in red and showing no such limit).

Fatigue limit, endurance limit, and fatigue strength are all expressions used to describe a property of materials: the amplitude (or range) of cyclic stress that can be applied to the material without causing fatigue failure. Ferrous alloys and titanium alloys have a distinct limit, an amplitude below which there appears to be no number of cycles that will cause failure. Other structural metals such as aluminium and copper, do not have a distinct limit and will eventually fail even from small stress amplitudes. In these cases, a number of cycles (usually 10) is chosen to represent the fatigue life of the material.

单词	Fatigue endurance limit
释义	Fatigue endurance limit 英语百科 Fatigue limit Fatigue limit, endurance limit, and fatigue strength are all expressions used to describe a property of materials: the amplitude (or range) of cyclic stress that can be applied to the material without causing fatigue failure. Ferrous alloys and titanium alloys have a distinct limit, an amplitude below which there appears to be no number of cycles that will cause failure. Other structural metals such as aluminium and copper, do not have a distinct limit and will eventually fail even from small stress amplitudes. In these cases, a number of cycles (usually 10) is chosen to represent the fatigue life of the material.
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Fatigue endurance limit

Fatigue limit