3-Noded Triangle with Drilling Rotations
I'm trying to better understand the 3-noded triangular element with drilling rotations.
I think that the 3-noded triangle with drilling rotations is derived from the 6-noded linear strain triangle by, for mid-side nodes, constraining out-of-plane dof & converting in-plane dof to nodal rotation.
In particular, I'm wondering about the following: