Abstract
In order to utilize the data on corrosion fatigue test to practical design, the correlations of corrosion fatigue strengths under various stress conditions are researched. In the paper, the reduction rate of fatigue strength due to corrosion, which we call corrosion effect βc, is compared under alternating bending and torsional stresses. Under the similar conditions of tests, βc in torsion is found always lower than in bending, and the relation of the both values is explained using authors' criterion on fatigue failures. Further, the effect βck of simultaneous notch and corrosion on fatigue strengths is studied by means of varying sharpness of circumferential notches of rotating bending test pieces. βck becomes less than βc×βk with sharpening of notches, and the progress is made clear.
