PSI - Issue 41

Liviu Daniel Pîrvulescu et al. / Procedia Structural Integrity 41 (2022) 492–499 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

496

5

Fig 5. Fatigue curves From the two equations (6) and (7) we obtain the correlation factor of the coefficient of fatigue strength, ′ , and the correlation factor for the slope of the fatigue curves, . The correlation is defined by two factors: ➢ Correlation of the fatigue curve so that it has the same coefficient of fatigue strength, ′ , Fig. 6: , , = ′ , ∙ ( ) ′ , ∙ = ′ , ′ , = ′ (8)

Fig 6. The factor for the slope of the fatigue curves ➢ Correlation of the fatigue curve so that it has the same slope, , Fig. 7: =

(9)