Repeat Prob. 6–66, with a completely reversed torsional moment of T = 160 N ∙ m applied.
Repeat Prob. 6–66, A solid round steel bar is machined to a diameter of 32 mm. A groove 3 mm deep with a radius of 3 mm is cut into the bar. The material has a mean tensile strength of 780 MPa. A completely reversed bending moment M = 160 N ∙ m is applied. Estimate the reliability. The size factor should be based on the gross diameter. The bar rotates.