Questions on Bending Stresses (which area will have 0 stress)

[Su Solberg]

http://en.wikipedia.org/wiki/Bending

Please have a look on the right most picture in "Stress in large bending deformation".
The Stress distribution shows that the bending center is not locate at the middle of the cross-section. (which also happen at connection caculation)

However, base on normal caculation on a beam under bending, the equation used(Stress=M*y/Ixx) is still assuming zero value at crosssection's center line.

I wonder what is their relationship.

Thank you very much in advence.

 

[ank_gl]

stress = My/I_xx

When y=0, stress = 0.

Do you know what "y" is?(it is not the the distance of plane from the center plane of the section always) Have you read about the neutral plane?

 

[Nick Bruno]

Neutral plan ftw!