A solid round steel bar is machined

A solid round steel bar is machined to a diameter of 1.25 in. A groove 1/8 in deep with a radius of 1/8 in is cut into the bar. The material has a mean tensile strength of 110 kpsi. A completely reversed bending moment M = 1400 lbf • in is applied. Estimate the reliability. The size factor should be based on the gross diameter. The bar rotates.

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