Move the cut position along the wall to see how the first moment Q builds up from a free edge, then converts into shear flow q = VQ/I and average thin-wall shear stress τ = q/t.
Section type
Vertical shear V
Positive = downward, negative = upward.
Wall thickness t
Characteristic width b
Characteristic height h
Cut position along wall
First moment
Section I
Shear flow
Average shear stress
Cross-section, accumulated Q region, and shear-flow direction
thin-wall centerlineaccumulated area used in Qlocal cut positionshear-flow direction