A rotating shaft, 15 mm in diameter, is made of plain carbon steel FeE 400 (Sy 400 N/mm2). It is subjected to axial tensile force of 3 kN, steady torsional moment of 65 N – m and maximum bending moment of 50 N – m. Calculate the maximum principlal streess theory and the factor of safety by maximum principal stress theory and maximum shear stress theory and the factor of safety by maximum shear stress theory?

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