MecMovies 4.0 : M12.13: Absolute Maximum Shear Stress

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Shear stress $τ_{y x}$ on the $y$ face acting in the $x$ direction.

Shear stress $τ_{x y}$ on the $x$ face acting in the $y$ direction.

Note: To satisfy equilibrium, $τ_{y x}$ must equal $τ_{x y}$ .