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Theory Manual Version 3.6
 Subsubsection 4.2.2.2: External work of surface forces Up Subsection 4.2.2: Shells with front and back face nodal displacements Subsubsection 4.2.2.4: Shell sandwiched between solid elements 

4.2.2.3 Shell on top of solid element

When a shell is coincident with the face of a solid element, we assume that the face of the solid element coincides with the back face ( ) of the shell element. This means that the solid element nodal displacements on that face coincide with the shell nodal displacements . Therefore, when we use UnpackLM for those solid elements, we should reassign the DOF ID's of the displacements to those of the displacements stored in that same node.
 Subsubsection 4.2.2.2: External work of surface forces Up Subsection 4.2.2: Shells with front and back face nodal displacements Subsubsection 4.2.2.4: Shell sandwiched between solid elements