Machine design question Steady stress and variable stress In machine elements?

1. A hot rolled steel shaft is subjected to a torsional load varying from 300 Nm clockwise to 150 NM counter clockwise and bending moment at a critical section varying from +400 Nm to -200 Nm. The shaft has uniform cross section and no keyway is present at the critical section. Determine the required shaft diameter, Assume σu = 500 N/mm2, σy = 400 N/mm2 and n = 2.

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