Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Tubular shaft undergoes torsion

  1. Sep 5, 2008 #1
    For a system where a tubular shaft undergoes torsion, the maximum shearing stress in the steel shaft must not exceed 70MPa. The outside diameter of the tubular shaft is 50mm and the inside is 25mm
    How do i determine the maximum torque that can be applied to the shaft?
  2. jcsd
  3. Sep 6, 2008 #2
    Re: torque

    The max shear stress occurs on the cross-section at the outer wall. The general torque equation is

    [tex]\tau[/tex] = [tex]\frac{Tc}{J}[/tex]

    where [tex]\tau[/tex] in this case is the max shear stress, T is the max torque, and c is the outside radius.

    J is the polar moment of inertia: J = [tex]\frac{\pi}{2}[/tex] (co4 - ci4).

    co =outside radius
    ci = inside radius
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook