Abstract
The results of the combined alternating bending and torsional fatigue tests on the specimens without notches were reported by the auther previously. In this paper the similar experiments made on the specimens with V-shaped circular notches are reported. Summary of the results are as follows:
(1) The ratio of the torsional fatigue limit to the bending fatigue limit increases with notches, and the increasing rate is larger in high carbon steel than in low carbon steel, but it is very small in cast iron.
(2) Excepting the case of mild steel, the fatigue strength of notched specimens under combined alternating bending and torsion can be represented by Equation (2) in this report. In mild steel the fatigue strength is lower than by Equation (2).
(3) Fatigue fractures of notched specimens are somewhat analogous to those of smooth specimens in the previous report.
