1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Solid mechanics problem

  1. Feb 23, 2010 #1
    Basically, my problem is small part of a bigger assignment, but I'm completely stuck at this point. This is really a math problem, but I figured I'd post it here anyway considering I might have misunderstood the physics.

    1. The problem statement, all variables and given/known data

    A vertical pipe is subjected to a axial force of 1089N and an Mb of 600Nm. The maximum stress in the pipe is not to be larger than 150MPa.

    I am to find the relation between di and do (di/do), where di is the inner- and do is the outer diameter of the pipe (which is part of a bigger construction.)

    2. Relevant equations

    von Mises theorem, but there are no sheer stresses in the pipe.

    Also,

    sigma=F/A+Mb/Wb+Mv/Wv. However Mv is zero in this case.

    3. The attempt at a solution

    sigma=F/A+Mb/Wb

    -> 150e6=1089/[(pi/4)*(dy^2-di^2)+600/(pi/32dy)*(dy^4-di^4)

    I can't seem to find a method to isolate di/dy from this equation, mainly because of the single dy in the Wb for circular pipes. Any help would be appreciated. If something is unclear don't hesitate to ask.
     
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted