8.21 (B). (a) A solid circular steel shaft is subjected to a bending moment of 10 kN m and is required to transmit amaximum power of 550 kW at 420 rev/min. Assuming the shaft to be simply supported at each end and neglecting theshaft weight, determine the ratio of the maximum principal stress to the maximum shear stress induced in the shaftmaterial.(b) A 300 mm external diameter and 200 mm internal diameter hollow steel shaft operates under the followingconditions:power transmitted = 2280 kW; maximum torque = 1.2 x mean torque; maximum bending moment= 11 kN m; maximum end thrust = 66 kN; maximum principal compressive stress = 40 MN/m².Determine the maximum safe speed of rotation for the shaft.[1.625:1; 169 rev/min.]

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8.21 (B). (a) A solid circular steel shaft is subjected to a bending moment of 10 kN m and is required to transmit a maximum power of 550 kW at 420 rev/min. Assuming the shaft to be simply supported at each end and neglecting the shaft weight, determine the ratio of the maximum principal stress to the maximum shear stress induced in the shaft material.

8.21 (B). (a) A solid circular steel shaft is subjected to a bending moment of 10 kN m and is required to transmit a maximum power of 550 kW at 420 rev/min. Assuming the shaft to be simply supported at each end and neglecting the shaft weight, determine the ratio of the maximum principal stress to the maximum shear stress induced in the shaft material.

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

8.21 (B). (a) A solid circular steel shaft is subjected to a bending moment of 10 kN m and is required to transmit a
maximum power of 550 kW at 420 rev/min. Assuming the shaft to be simply supported at each end and neglecting the
shaft weight, determine the ratio of the maximum principal stress to the maximum shear stress induced in the shaft
material.
(b) A 300 mm external diameter and 200 mm internal diameter hollow steel shaft operates under the following
conditions:
power transmitted = 2280 kW; maximum torque = 1.2 x mean torque; maximum bending moment
= 11 kN m; maximum end thrust = 66 kN; maximum principal compressive stress = 40 MN/m².
Determine the maximum safe speed of rotation for the shaft.
[1.625:1; 169 rev/min.]

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