Ashes can perfom Rainflow counting on stress time series, which will give a stress histogram of number of cycles for a given stress ranges. Based on the S-N curves (also known as Wöhler curves) selected by the user, a fatigue damage is computed for each of the stress ranges.

The Palmgren-Miner rule is then applied to compute the total fatigue damage for the stress time series.

The stress time series will take into account the Stress Concentration Factor, either manually entered by the user or automatically computed based on DNV-RP-C203 (2016). The user can specify how many points along the cross section should be checked for fatigue damage.

When using the Batch manager, it is possible to compute the total fatigue life corresponding to all the Load Cases that were run.

2.7.1 Fatigure analysis procedure
2.7.2 Eurocode1993 S-N curves