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• Bending moments, twisting moments, shearing forces, and net shearing forces: The bending moments Mx and My act tangentially around the y- and x-axes respectively on the y, z and x, z faces of a plate element of volume tdxdy. The twisting moments Mxy and Myx act on the same faces but perpendicularly to them i.e. around the x- and y-axes. From the stress components (1.124b), these moments are, per unit length of the element side,

ft/2

Oxxzdz = D

Oyyzdz-

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