PSI - Issue 22

6

Z. Marciniak et al. / Procedia Structural Integrity 22 (2019) 393–400 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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a)

b)

Fig. 5. Comparison of fatigue lives of specimens obtained from calculations N cal and experiments N exp for phase shift: a)  = 0°, b)  = 90° and stress amplitudes σ a = τ a .

a)

b)

Fig. 6. Comparison of fatigue lives of specimens obtained from calculations N cal and experiments N exp for phase shift: a)  = 0°, b)  = 90° and stress amplitudes σ a = 2τ a .

4. Conclusions Based on the calculated and experimental fatigue lives for the tested 10HNAP steel, the following conclusions can be formulated:  The fatigue lives of round specimens calculated according to the modified Tresca criterion are the most similar to the experimental lives and they are included into the scatter band of coefficient 3 for all the applied amplitude ratios and stress phase shifts.