I have been running a finite-element simulation where, for the sake of convergence, I chose to stay in small deformation hypothesis (in comsol, include non-linear geometry box not checked for who that may concern).
Now, my simulation is made-up so that geometry actually undergoes very large deformations.
Under comsol, I've read that rotation matrix is computed in a different manner (some kind of linear version).
My question is : in a finite-element simulation with a presence of a rigid body, do the rotation matrix of that rigid body is computed AFTER the displacement field computation or BEFORE ?
In other terms, does the fact that the rotation matrix is linearized affects the displacement of the rigid body ?