MecMovies 4.0 : M12.13: Absolute Maximum Shear Stress

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

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

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