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

Equilibrium in solid body

  1. Oct 30, 2008 #1
    Why is it the integral of delta P that must equal P1 and P2 in the second diagram (half of the original body)? I thought it is simply that Delta P = (P4 + P3).

    Attached Files:

  2. jcsd
  3. Oct 30, 2008 #2
    I don't really get what your asking? I think the diagram is basically just stating that internal stresses in a solid 3D body must sum to zero, if they do not then the body is exploding.
  4. Oct 31, 2008 #3


    User Avatar
    Science Advisor

    It says that if you bisect the body, that is already in equilibrium, the resultant surface integral has to equal P1+P2, which were removed, for the body to stay in equilibrium. It would also be correct to say what you are saying, but I think the main idea was that the surface integral has to be equal to what was removed.
  5. Nov 1, 2008 #4
    So stress=force/area. Does it mean that if I find the stress over the area (Delta A) and integrate it with respect to Delta A, then I get the new force which is equal to the sum of P1 and P2?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Equilibrium solid body Date
Thermal equilibrium formula Feb 6, 2018
Comsol Help -- How to Enable Rotating? May 20, 2017
Equilibrium in a pure substance Apr 24, 2017
Statics Equilibrium problem May 16, 2016
Temperature drop in tank Apr 1, 2015