Solid Shaft
Posted August 20, 2010
By admin
i need to determine the minimum diameter for a shaft transmitting 60kw at 125rpm.?
the material has a shear strength of 45Mpa and the angle of twist is limited to 3deg over 3m length. G = 70Gpa
i)for solid shaft
ii)for hollow shaft.
i started with T=P/w to get T=4347.826Nm
then put values into J=(TL)/(G.theta) where theta is twist ang.this gave me J of 6.211e-8 and therefore a radius of 14.1mm
however!!! if i then go another way, using
t (tao, max shear) = TR/J i get r=39.47mm!
so if i use the twist as the limit i get 1 answer and the shear as the limit another.
if i use the 1st radius and put it into an equation with G, L T etc again to find tao it gives me like 980Mpa!!
is there a way i can find r with an equation that take the twist angle, shear strength both into account!?
very long winded i know but any help would be much appreciated!
I suspect that you need to calculate the required diameter both ways and select the larger answer.
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