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Modification of the equation for description of Wöhler's curves

Kłysz S., Lisiecki J., Bąkowski T.

Prace Naukowe Instytutu Technicznego Wojsk Lotniczych

2010

nr 27

99-104

The paper presents the way to modify the equation Q= f(2Nf) in order to improve the fit of experimental results from High Cycle Fatigue tests. In particular, the study deals with introduction of the 5-parameter exponential equation that enables better fit of the full Wöhler's curve to experimental data within the range of stress at the level of fatigue threshold as well as approximation to the quasi-static range and Low Cycle Fatigue tests for the highest stress values. It is illustrated how individual parameters affect the procedure and possibility to match the aforementioned equation to experimental data.