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'Fatigue limit' is a property of ferrous alloys and titanium alloys[1]. It is the constant amplitude (or range) of cyclic stress that can be applied to a material without causing fatigue failure. Other structural metals such as aluminium, do not have a distinct fatigue limit and will eventually fail even from small stress amplitudes. In these cases, a number of cycles (usually 10⁷) is chosen to represent the fatigue life of the material. The corresponding stress amplitude is then referred to as the "Endurance Limit".

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★ fatigue (material)