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Theory Manual Version 3.6
 Subsection 4.2.2: Shells with front and back face nodal displacements Up Subsection 4.2.2: Shells with front and back face nodal displacements Subsubsection 4.2.2.2: External work of surface forces 

4.2.2.1 Elastic Shell

For an elastic solid, the internal virtual work is where For the external work of body forces, where
The linearization of the internal virtual work is So where Similarly, where
The linearization of the external work is where
 Subsection 4.2.2: Shells with front and back face nodal displacements Up Subsection 4.2.2: Shells with front and back face nodal displacements Subsubsection 4.2.2.2: External work of surface forces