8.5 (A). A flanged coupling having six bolts placed at a pitch circle diameter of 180 mm connects two lengths of solid steel shafting of the same diameter. The shaft is required to transmit 80 kW at 240 rev/min. Assuming the allowable intensities of shearing stresses in the shaft and bolts are 75 MN/m² and 55 MN/m² respectively, and the maximum torque is 14 times the mean torque, calculate: (a) the diameter of the shaft; (b) the diameter of the bolts. [B.P.][67.2, 13.8 mm.]

8.5 (A). A flanged coupling having six bolts placed at a pitch circle diameter of 180 mm connects two lengths of solid steel shafting of the same diameter. The shaft is required to transmit 80 kW at 240 rev/min. Assuming the allowable intensities of shearing stresses in the shaft and bolts are 75 MN/m² and 55 MN/m² respectively, and the maximum torque is 14 times the mean torque, calculate: (a) the diameter of the shaft; (b) the diameter of the bolts. [B.P.][67.2, 13.8 mm.]

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Concept explainers

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.

Question

8.5 (A) A flanged coupling having six bolts placed at a pitch circle diameter of 180 mm connects two lengths of
solid steel shafting of the same diameter. The shaft is required to transmit 80 kW at 240 rev/min. Assuming the
allowable intensities of shearing stresses in the shaft and bolts are 75 MN/m² and 55 MN/m² respectively, and the
maximum torque is 1.4 times the mean torque, calculate:
(a) the diameter of the shaft;
(b) the diameter of the bolts.
[B.P.] [67.2, 13.8 mm.]

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