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ST7-1.57.20.6 Plate Drilling Degrees of Freedom
The classical theory for the structural analysis of plates describes the strains in the plate in terms of the two in-plane displacements (u,v), the transverse displacement (w), and rotations about two axes in the plane of the plate. The rotation about the normal to the plate does not appear in the theory. This degree of freedom is often referred to as the drilling degree of freedom because of the analogy with a drill used to drill a hole through a plate.
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