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

Plate with a hole problem

  1. Apr 23, 2017 #1
    Is t right that, in a plate with a hole, subjected to uniaxial loading, along one of the axis, one gets compressive stresses around the crack tip (in the same direction as that of the applied load ). I'm not able to understand this intuitively. Can someone help?

    I believe, intuitively, these compressive stresses (See sketch below) are due to Poisson's effect, although the magnitude might be greater because of the hole. There is 'nothing special' concerning the these compressive stresses as such.

    plate_with_hole.gif

    Any comments?
     
    Last edited: Apr 23, 2017
  2. jcsd
  3. Apr 23, 2017 #2

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    Not entirely sure what you are asking ?
     
  4. Apr 24, 2017 #3
    1) IF you look at the problem with a plate with a hole., around the hole you have a state of biaxial stress developed, see figure below. This can be proved mathematically if I look into the book by Timoshinko. But can't sense the biaxial stresses physically? Can you? How?

    2) IT is not shown in the figure below, but adjacent to the hole some distance away, there will also be a compressive stress in horizontal direction, again , I can't sense it physically.

    plate_with_hole_2.gif
     
  5. Apr 24, 2017 #4

    Nidum

    User Avatar
    Science Advisor
    Gold Member

    Hole in infinite plate v5 v1.png Hole in infinite plate v5 v1 v1 enlarged.png

    Greatly magnified views of distortion of a thick plate with a hole . Uniform stress applied to top and bottom edge faces . The plate is not infinite but it is relatively big compared to hole diameter .

    Can you see how the distorted shape of the hole relates to the stress distribution around the hole ?
     
  6. Apr 24, 2017 #5
    No, I think you didn't get my question still.


    See figure below. I have given the expression for σθθ

    If you put θ = 0, you get σθθ = - σxx

    That is compressive stress . This is what I'm trying to sense physically

    plate_with_hole_3.gif
     
    Last edited: Apr 24, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted