A ship's shaft operates at 150 rpm and resists a maximum shear stress of 50 MPa. The shaft has an outer diameter of 45 cm and an inner diameter of 30 cm, as shown in the figure. Determine: What is the maximum power that can be transmitted without exceeding the allowable shear stress? If the rotational speed of the shaft is limited to half, but the same shaft power is maintained, what happens to the shear stress in the shaft?

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Q: Shear stress in the shaft.

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Combined Loading

Any functioning component, such as machine parts, structural members, pressure vessels, and so on, are all under the influence of more than one force. When anybody is under the influence of more than one force such as shear forces, bending moments, axial forces, torsion, and so on, then such body is said to be under combined loading. A very practical example of combined loading is the crankshaft of an internal combustion engine (IC engine). The crankshaft of the IC engine is under high rpm, which is caused due to the torsional forces. Due to the presence of piston, counterbalances, and internal imbalances, the crankshaft experiences lateral forces and due to the rise in temperature, the crankshaft undergoes thermal expansion, which pulls the crankshaft along the axial direction and lateral direction. The presence of unbalanced loads along the periphery of the crankshaft also induces a bending moment.