Typical Values
Typical values of the limit (Se) for steels are 1/2 the ultimate tensile strength, to a maximum of 100 ksi (690 MPa). For iron, aluminium, and copper alloys, Se is typically 0.4 times the ultimate tensile strength. Maximum typical values for irons are 24 ksi (165 MPa), aluminums 19 ksi (131 MPa), and coppers 14 ksi (96.5 MPa). Note that these values are for smooth "un-notched" test specimens. The endurance limit for notched specimens (and thus for many practical design situations) is significantly lower.
Read more about this topic: Fatigue Limit
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