Shear stress and normal stress

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Homework Statement


why the shear stress is maximum at the center ? while the normal stress is maximum at the boundary ?

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Homework Equations




The Attempt at a Solution


why shouldn't the shear stresss maximum at the boundary ? this is because shear stress is to pull the 2 surface apart [/B]
 

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  • #2
SteamKing
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Homework Statement


why the shear stress is maximum at the center ? while the normal stress is maximum at the boundary ?

ETpHIWJ.jpg

Homework Equations




The Attempt at a Solution


why shouldn't the shear stresss maximum at the boundary ? this is because shear stress is to pull the 2 surface apart [/B]
Why should shear stress be a maximum at the boundary? There is nothing being sheared there, i.e., the boundary is not being restrained.
 
  • #3
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I noticed one thing , why the normal stress is maximum and minimum at the boundary?
 
  • #4
SteamKing
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I noticed one thing , why the normal stress is maximum and minimum at the boundary?
If the normal stress is produced as the result of bending, then the locations the furthest away from the neutral axis of the section will also have the highest stress, in tension and compression.
 
  • #5
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If the normal stress is produced as the result of bending, then the locations the furthest away from the neutral axis of the section will also have the highest stress, in tension and compression.
can you explain further? i still dont understand
 
  • #6
SteamKing
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can you explain further? i still dont understand
Do you understand what bending stress is? How it's calculated?
 
  • #7
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Do you understand what bending stress is? How it's calculated?
bending stress is shear stress?
 
  • #8
SteamKing
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bending stress is shear stress?
No, bending stress is not the same as shear stress.

Bending produces normal stresses in a section, both compressive and tensile. Along the neutral axis, the bending stress is zero.
 
  • #9
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If the normal stress is produced as the result of bending, then the locations the furthest away from the neutral axis of the section will also have the highest stress, in tension and compression.
why the location further away from neutral axis will have maximum stress?
 
  • #10
SteamKing
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Because the fibers at those locations undergo the greatest stretching/compression.

Look, instead of me spoon-feeding you elementary beam theory, it would probably be better for you to grab an elementary strength of materials text and learn this material first hand.

http://homepages.engineering.auckla...07_Elasticity_Applications_04_Beam_Theory.pdf
so , the normal stress is maximum on the the upper part of the beam , the normal stress is minimum at the lower part of the beam(expansion) ?
 
  • #12
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bump
 

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