Note that the shear stress must are zero at the top and bottom of the cross section, because there are no stresses on the outer surfaces of the beam. Also note that the max. shear stress occurs at the neutral axis.
shear strains
- Shear strain distribution is
parabolic like the shear stress distribution.
- max. shear strain at neutral axis
- zero shear strain at top and bottom surfaces
- Shear stresses cause warping of the cross section.
