If the shearing stress fv is multiplied by the width b, we obtain a quantity q, known as the shear flow, which represents the longitudinal force per unit length transmitted across a section at a level y1 from the neutral axis.
Application of Flexural and Shearing Stresses to Rectangular Section
For rectangular section, and
The bending stress at a level from the neutral axis is
and the maximum bending stress in the section is
The maximum shearing stress in the section is