Problem 7. The 30-mm diameter shaft is subjected to the vertical and horizontal loadings of two pulleys as shown. It is supported on two journal bearings at A and B which offer no resistance to axial loading. Furthermore, the coupling to the motor at C can be assumed not to offer any support to the shaft. The shaft is subjected to both M₂ and My internal bending moment components. (a) Draw a bending moment diagram for each component. (b) Since all axes through the circle's center for circular shaft are principal axis, then the resultant M = √ √M²+ M² can be used to determine the maximum bending stress. Determine the location and y 150 N 1 m Z 150 N 1 m E 60 mm 1 m 100 mm B 1 m 400 N 400 N

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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.