Corrosion-fatigue resistance of steel in cyclic bending and torsion

Summary As a result of the action of corrosive media the ratio of the fatigue limit in torsion to that in bending (in the long endurance range) is increased to k=1, as compared with k=0.5–0.6 recorded in air. In other words, the torsional fatigue strength of steel in corrosive media is reduced much less than the fatigue strength in bending.In the low endurance range, a liquid corrosive medium may increase the fatigue strength as a result of its cooling action. Tests in corrosive and neutral media supported the view that the fatigue strength at high overloads depends to a large extent on the thermal effect associated with the internal friction of the specimen material.