Approximate determination of a strain-controlled fatigue life curve for aluminum alloy sheets for aircraft structures

This paper deals with selected methods of approximate determination of a strain-controlled fatigue life curve for aluminum alloy sheets used in aircraft structures. Authors based their analysis of those methods on the results of own research of 2024-T3 alloy and its Russian equivalent D16CzATW. The approximate strain-fatigue life curves were compared with the experimental curves. The influence of inconsistencies between those curves on the calculation results was analyzed on computational examples by means of the Palmgren–Miner’s rule.

► Methods of approximate determination of a strain-controlled fatigue life curve.
► 2024-T3 and Russian D16CzATW aluminum alloy sheets used in aircraft structures.
► Comparison of the approximate and the experimental strain-fatigue life curves.
► Analysis of influence of inconsistencies between curves on the calculation results.
► Computational example by means of the Palmgren–Miner’s rule.