A 50-mm-diameter shaft is made of a brittle material. The shaft is subjected to a static torque T = 1.20 kN • m. A bending moment M is increased in magnitude until fracture occurs. The fracture surface is found to make an angle of 1.0 rad with a longitudinal line drawn on the shaft. If the maximum principal stress criterion of failure is valid for this material and loading, determine the magnitude of M and ultimate strength σu for the material.
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