The drive shaft for a truck (outer diameter 80 mm and inner diameter 25 mm) is running at 2,300 rpm (see figure). 2,300 rpm 80 mm 25 mm 80 mm (a) If the shaft transmits 150 kW, what is the maximum shear stress in the shaft? (Enter the magnitude in MPa.) MPa (b) If the allowable shear stress is 30 MPa, what is the maximum power (in kW) that can be transmitted? kW

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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.