Reply To: Shell boundary condition

[peteroznewman]

It's fine to apply displacements to points on beams, edges on shells and faces on solids.
It's very bad to apply displacements to a point on a solid.
It's bad to apply displacements to an edge on a solid.
Both cases introduces a stress singularity into the model where the value of stress depends on the element size because the force is being divided by geometry (point or edge) with zero area.