The discussion revolves around the concepts of shear stress and normal stress, particularly in the context of bending in beams. Participants explore why shear stress is considered maximum at the center of a beam while normal stress peaks at the boundaries. The conversation includes questions about the nature of these stresses and their calculations.
Participants express differing views on the nature of shear and normal stresses, particularly regarding their maximum points in a beam under bending. There is no consensus on the explanations provided, and some questions remain unresolved.
Participants reference elementary beam theory and the need for foundational understanding, indicating that some assumptions and definitions may not be fully articulated or agreed upon.
Why should shear stress be a maximum at the boundary? There is nothing being sheared there, i.e., the boundary is not being restrained.foo9008 said:Homework Statement
why the shear stress is maximum at the center ? while the normal stress is maximum at the boundary ?
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]
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.chetzread said:
can you explain further? i still don't understandSteamKing said:
Do you understand what bending stress is? How it's calculated?chetzread said:
bending stress is shear stress?SteamKing said:
No, bending stress is not the same as shear stress.chetzread said:
why the location further away from neutral axis will have maximum stress?SteamKing said:
Because the fibers at those locations undergo the greatest stretching/compression.chetzread said:
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) ?SteamKing said: