# Beam Shear Stress

Written by Jerry Ratzlaff on . Posted in Classical Mechanics

Beam shear stress, abbreviated as $$\tau$$ (Greek symbol tau), is the horizontal shear stress of a beam.

## Beam Shear Stress formula

 $$\large{ \tau = \frac{ V \; Q }{ I \; t } }$$

### Where:

$$\large{ \tau }$$ (Greek symbol tau) = shear stress

$$\large{ Q }$$ = first moment of area

$$\large{ t }$$ = material thickness perpendicular to shear

$$\large{ I }$$ = moment of inertia of entire area cross-section

$$\large{ V }$$ = total shear force at the point of location