Master Curve of Fatigue Strength for Zero Stress Ratio

3 Master Curve of Fatigue Strength for Zero Stress Ratio 

To describe the master curve of 0, the reduced frequency/ and the reduced time are required. These are defined by  

The master curves Om To) can be derived from S-N curves by the following 

By establishing the master curve for fatigue strength of zero stress ratio for Nf, the fatigue strength for f, under arbitrary combinations of/and T can be determined. 

The master curve for the creep strength o,(fV o) allows to follow creep strength at any temperature T. The creep strength can be regarded as fatigue strength Of i at unit stress ratio 1 and arbitrary frequency/with tg = fjas shown 

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