The working conditions to be satisfied by a shaft transmitting power are (a) that the shaft must not twist more than 1 degree on a length of 15 diameters, and (b) the shear stress must not exceed 55 N/mm². If G =80,000N/mm2 what is the diameter of shaft to transmit 1 MWatt 240 r.p.m.?

The working conditions to be satisfied by a shaft transmitting power are (a) that the shaft must not twist more than 1 degree on a length of 15 diameters, and (b) the shear stress must not exceed 55 N/mm². If G =80,000N/mm2 what is the diameter of shaft to transmit 1 MWatt 240 r.p.m.?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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

The working conditions to be satisfied by a shaft transmitting power are (a) that the shaft must not twist more than 1 degree on a
length of 15 diameters, and (b) the shear stress must not exceed 55 N/mm2. If G =80,00ON/mm2 what is the diameter of shaft to
transmit 1 MWatt 240 r.p.m.?

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