Recent content by pegghead

I know where i was having problems it was in the formula, i was dividing Pi by 2x(r^4) and not Pi/2 x (r^4). I get a result of 26534.37mm^3 for Z. However when i now multiply this by the 77,000N/mm^2 i get 2043146490Nmm. Not the 4.15x10^7 that you got.

The allowable stress figure that i have is 77KN/mm^2.

the figure i am getting for J is around 6.5E-8

I have calculated the torque using the formulas given and i get 3.5E-5 Nmm of torque that a Ø140mm shaft can transmit when material allowable stress is 77,000N/mm^2. I think somewhere i have miscaculated, i have checked a couple of times and got the same result. O/D = 140mm R = 70mm...

I don't have a strength of material book. Could yoou tell me the equations that i need. Like T = ? ? ? ? ? and J = ? ? ? ? ?

Sorry no i don't know how to calculate J.

The figure i have for the material is 77,000N/mm^2

I have a stainless steel shaft that is Ø140mm x 936mm long. I need to calculate what the maximum torque is that I can apply to this shaft. I have looked around for formulas and have just got myself confused. Could someone tell me what the formula is that i need to work this out.