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". Typical values of the endurance limit (Se) for steels are 1/2 the ultimate tensile strength, to a maximum of 100 ksi. For irons, aluminums, and copper alloys, Se is typically .4 times the ultimate tensile strength. Maximum typical values for irons are 24 ksi, aluminums 19 ksi, and coppers 14 ksi.
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