The SN-curve is defined by specifying the inflection points between the static and limited life sections and between the limited life and the fatigue strength sections, as well as the allowable long-term contact stress number.
| σHlim,stat |
Allowable contact stress number (static) |
| NLstat |
Number of load cycles of the flank (static) |
| σHlim |
Allowable contact stress number |
| NLRef |
Number of contact stress load cycles |
| σHlim,LD |
Allowable contact stress number (long-term) |
| NLLD |
Number of long-term load cycles of the flank |