Correlation between fatigue limit, ultimate strength and other mechanical characteristics of steels and alloys

Conclusions

• 1. The fatigue limit σ₋₁ correlates more closely with the ultimate strength than with other strength characteristic

• 2. In a number of very important cases (variation in temperature of the medium, tempering temperature, degree of work hardening, etc.) there is a linear relationship between σ₋₁ and σ_b. Evaluation of σ₋₁ on the basis of this realationship leads to fever than when assuming the ratio σ₋₁]σ_b to be constant, or when using the Striebeck, Maylinder, Junger and Zhukov equations.

• 3. If there is an abnormal relationship between σ_b and temperature, degree of work hardening, aging or variation in the direction of cut of the specimens, there is no correlation between σ₋₁ and σ_b.