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Total moment of shear stress about the center line of a cylinder

  1. Sep 21, 2014 #1
    http://postimg.org/image/onxjqc26l/ [Broken]

    I have found the shear stress of the inner cylinder to be 405 Pa like in the solution
    but I am having trouble visualizing the total moment of this stress about the center line.
    I was wondering if someone could explain where that d(theta) in the moment expression comes from, possibly with a diagram

    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Sep 21, 2014 #2
    The d(theta) comes in because you have to integrate around the circumference of the cylinder. The force on a differential area of the cylinder is ##dF=\tau (L r_id\theta)##.
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