Understanding Compressive Stresses in a Plate with a Hole Under Uniaxial Loading

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In a plate with a hole subjected to uniaxial loading, compressive stresses develop around the crack tip in the same direction as the applied load, influenced by Poisson's effect. The presence of the hole creates a state of biaxial stress, which can be mathematically validated but is difficult to visualize physically. Additionally, compressive stresses occur adjacent to the hole, complicating the intuitive understanding of stress distribution. The relationship between the distorted shape of the hole and the stress distribution is crucial for grasping these concepts. Overall, understanding these stress patterns requires a deeper exploration of the mechanics involved.
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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?
 
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Not entirely sure what you are asking ?
 
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
 
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 ?
 
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
 
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