APPROXIMATE DETERMINATION OF A STRAIN-CONTROLLED FATIGUE LIFE CURVE FOR ALUMINUM ALLOY SHEETS

Adam Lipski, Stanisław Mroziński
unpublished
This paper deals with selected methods of approximate determination of a strain-controlled fatigue life curve for aluminium alloy sheets used in aircraft structures first of all. 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
more » ... ational examples by means of the Palmgren-Miner's rule. List of major symbols and abbreviations 2N f-reversals to failure (2 reversals = 1 cycle) b-fatigue strength exponent c-fatigue ductility exponent E-Young's modulus, MPa N cal-calculating fatigue life obtained on the basis of the approximate strain-controlled fatigue life curve, cycles N exp-calculating fatigue life obtained on the basis of the experimental strain-controlled fatigue life curve, cycles RA-reduction in area S u-ultimate tensile strength, MPa ε f-true fracture ductility f ε ′-fatigue ductility coefficient ∆ε-total strain range ∆ε e-elastic strain range ∆ε p-plastic strain range σ f-true fracture strength, MPa f σ ′-fatigue strength coefficient, MPa FPCM-Four-Point-Correlation Method USM-Universal Slopes Method
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