A stepped-solid-round steel shaft (ultimate strength of 800 MPa and yield strength of 650 MPa) is subjected to fluctuating bending moment with a maximum moment of 1000 N-m and a minimum of 500 N-m. The smaller diameter of the shaft is 30 mm, the larger diameter is 36 mm with a shoulder fillet radius of 1.5 mm. What are the alternating and mean stresses for fatigue analysis?

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