A solid shaft has to transmit 120 kW of power at 160 rpm. If the shear stress is not to exceed 60 MPa and the twist in a length of 3 m must not exceed 1°. Find the suitable diameter of the shaft. Take G = 80 GPa.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Torsion Homework
H.wl
A solid shaft has to transmit 120 kW of power at 160 rpm. If the
shear stress is not to exceed 60 MPa and the twist in a length of
3 m must not exceed 1°. Find the suitable diameter of the shaft.
Take G = 80 GPa.
H.w2
Find the diameter of the shaft required to transmit 60 kW at
150 rpm if the maximum torque exceeds 25% of the mean
torque for a maximum permissible shear stress of 60 MN/mm.
Find also the angle of twist for a length of 4 m. Take
G-80GPA.
H.w3
A solid cylindrical shaft is to transmit 300 kW power at
100 r.p.m. (a) If the shear stress is not to exceed 80 N/mm2
find its diameter. (b) What percent saving in weight would be
obtained if this shaft is replaced by a hollow one whose internal
diameter equals to 0.6 of the external diameter, the length, the
material and maximum shear stress being the same?
Transcribed Image Text:Torsion Homework H.wl A solid shaft has to transmit 120 kW of power at 160 rpm. If the shear stress is not to exceed 60 MPa and the twist in a length of 3 m must not exceed 1°. Find the suitable diameter of the shaft. Take G = 80 GPa. H.w2 Find the diameter of the shaft required to transmit 60 kW at 150 rpm if the maximum torque exceeds 25% of the mean torque for a maximum permissible shear stress of 60 MN/mm. Find also the angle of twist for a length of 4 m. Take G-80GPA. H.w3 A solid cylindrical shaft is to transmit 300 kW power at 100 r.p.m. (a) If the shear stress is not to exceed 80 N/mm2 find its diameter. (b) What percent saving in weight would be obtained if this shaft is replaced by a hollow one whose internal diameter equals to 0.6 of the external diameter, the length, the material and maximum shear stress being the same?
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