Calculate Power from 100mm Rotating Shaft

[John78]

Homework Statement

Calculate the power that can be safely transferred by a 100 mm shaft rotating at 150 revolutions per minute.

Homework Equations

Radius = diameter/2=100/2=50 mm
Shaft from mild structural steel
K=6
T= 320 N/mm2

The Attempt at a Solution

J=(3.14/2)*r4
J=(3.14/2)*504= 1.57*6250000=9812500
T=TJ/KY=320*9812500/6*50=3140000000/300=10466666.67 Nmm
Changed to Nm= 10.466 Nm
Per minute 150
Per second = 150/60 = 2.5per second
Angular velocity= 2.5 *(2*3.14)= 2.5*6.28=15.7 rad/sec
Power=15.7*10.466=164.3162 Nm/sec= 164.3162 watts
Power changed to horsepower= 220.35162 (hp) ??


Please check my result:D

 

[John78]

can anyone help?

 

[azizlwl]

Homework Statement

Calculate the power that can be safely transferred by a 100 mm shaft rotating at 150 revolutions per minute.Please check my result:D

I guess if the shaft is made of bamboo, less power transferred than if it is made of steel.