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Question: a marine propeller shaft of 200 mm diameter is subjected...

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A marine propeller shaft of 200 mm diameter is subjected to a torque of 126 kNm and a pure bending moment of 157 kNm. During inspection, a small surface crack is observed at 60° to the longitudinal axis of the shaft, as shown in Fig.Q6. Determine the normal and shear stresses at the crack as it passes through positions A, B and C during rotation of the shaft (a) (b) Display stress elements for points A, B and C on the outer surface (c) Derive expressions for the principal stresses and determine principal stresses at A, B, and C 60° 60° Surface crack Fig.Q6

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