Enhancement of fatigue strength

(1) For applied stress ratio values less than R = +0,5 the reference fatigue strength Aac may be enhanced by an R ratio factor f(R) where the enhanced reference fatigue strength Aa^) at 2 x 106 cycles is given by:

(2) The value of f(R) depends on the value of R and the type of component and detail (see G.2).

(3) The fatigue strength at 104 cycles should not be enhanced.

(4) The basic slope mi(R) of the enhanced Aa-N curves shall be adjusted in accordance with the values of Ac at 104 and 2 x 106 cycles (see fig. G.l.l.)

Endurance N

Table G.l.l. Enhancement of Aa-N curve

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