Modification to AaN Curves

(1) For endurance between 103 and 105 cycles the fatigue design curve may be defined as:

Nj is the calculated number of cycles to failure of a stress range Aal

Ac is the reference value of fatigue strength at 2,106 cycles depending on the detail category

Acrj is the principal stress range at the detail and is constant for all cycles m0 is the inverse logarithmic slope of the Aa-N curve in the range 103 and 105 cycles, depending on the detail category, alloy and R-value mi is the inverse logarithmic slope of the Aa-N curve, depending on the detail categoiy, see tables 5.1.1 to 5.1.5 or 5.2.1.

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